Difference between revisions of "Modifications during service time"
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<center>'''LIST OF MODIFICATIONS - ENGLISH-BUILT DHC-1 CHIPMUNK SERIES'''</center> | <center>'''LIST OF MODIFICATIONS - ENGLISH-BUILT DHC-1 CHIPMUNK SERIES'''</center> | ||
Latest revision as of 12:44, 27 May 2020
Back to Index of Modifications
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Date of Introduction |
Applicability |
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To Introduce ‘Z’ type Harness with Revised Anchorages |
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To Introduce Fuel Filter in Fuel Feed Line to Engine |
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T Mk10, Mk20, 21, 22, 22A |
To Improve Sealing Between Fuel Tank and Sump |
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To Introduce Instruments with SAE Cases |
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T Mk10 Mk21 |
To Introduce Carbon Pile Type of Voltage Regulator in Lieu of Tyrell Type. Part A: Post Modification H.61. Part B: Pre-Modification H.61 |
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To Provide an Approved Protecting Coating in Battery Compartment. (not required when Mod. H.29 is embodied) |
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T Mk10 Mk20, 21 |
To Improve Venting of Battery Compartment and Make Holding Down Thumbscrews more Accessible |
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To Introduce Blanking Plates for use of S.A.E. Case Instruments in Existing Panels |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce ‘Lord’ Mountings in Series to Permit Increase Deflection of Instrument Panel |
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Miscellaneous Amendment |
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Miscellaneous Amendment |
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To Introduce A.1134A (Interim Scheme Pending Modification H.36) |
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To Introduce Fixed Parts for TR.1936 VHF Radio on the 170th and Subsequent Aircraft |
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T Mk10 Mk22, 22A |
Radio: To Introduce Removable Parts for TR.1936 10 Channel VHF Radio in Lieu of TR.1520 or TR.1920 |
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Radio: To Introduce Fixed Parts for TR.1934 or TR.1936 10 Channel VHF Radio |
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T Mk10 Mk20, 22, 22A |
To Introduce SKF Bearing CBS/2 in Lieu of Torrington Bearing at Rudder Pivot Bracket |
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To Introduce TR.1520 VHF 4 Channel Radio for ac without TR.1920 |
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To Reposition Hand Brake Lever Within Easier Reach of Pilot |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Fuel Cock Lever |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Control in cockpit for ‘Coffman’ Engine Starter |
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To Delete Engine Data Plate in Cockpit |
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To Introduce Fuel Tanks with Redesigned Attachment at Filler |
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T Mk10, Mk20, 21, 22, 22A |
To Plug or Delete Canopy Plunger Hole at the 16.1 ins. Position from the Rail Front End |
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To Redesign Canopy Release Mechanism to Prevent Wear of Canopy Release Cable and to Provide Hole at Aft End of Canopy Rail |
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To Introduce Standard A Locking of the Bolts Attaching the Tailplane Attachment Fitting to the Bulkhead |
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To Introduce Revised Labels which Alter the Max Speed at Which Flaps can be Lowered from 74 to 71 Knots |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce ‘Coffman’ Starter S7 Mk.2 Embodying Plessey Modification 90 |
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Miscellaneous Amendment |
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Amendment to Chipmunk DIS |
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To Introduce Modified Extension to Rear Engine Driven Fuel Pump Priming Lever (Post Modification GM.1717) |
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T Mk10 Mk21, 22, 22A |
To Simplify Design of Rear End of Exhaust Manifold |
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To Introduce a Vent in Fuselage Side for Goggle (two stage colour) Demisting |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce more Robust Canopy Front Rollers (Superseded by Modification H.173) |
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To Add Auxiliary Vent Hole in Fuel Tank Stack Pipe Vent (Superseded by Modifications H.138 & H.207) |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Socket for Bowser Bonding Plug Adjacent to Fuel Filler Cap |
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To Introduce Redesigned Sealing Glands at Throttle and Mixture Control Rods Through Firewall |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Undercarriage Wheel AH.9389 with Improved Fixing for Brake Plate Location Blocks in Lieu of AH.9126 |
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To Introduce Revised Protective Treatment and Finish on Ground Equipment |
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To Revise Voltage Regulator Circuit to Avoid Burning Out Generator (Superseded by Modification H.27) |
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To Introduce Strengthened Attachment Feet for Oil Tank Air Inlet Duct |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Rivets to Reinforce Existing Spot Welds on Both Cockpit Seats |
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To Improve the Fixing of Aileron Mass Balances |
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To Introduce Support Strut for Plessey Cartridge Starter |
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To Stiffen Tailplane Attachment Fittings to Prevent Panting of Front Spar Web |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Larger Diameter Pulleys for Rudder Cables in Centre Fuselage |
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Miscellaneous Amendment |
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To Lock Positively the Aileron and Rudder Stop Bolts |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Improved Tailplane Attachment Fittings on Rear Fuselage Bulkhead |
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To Provide a Means of Ensuring that the Canopy Emergency Panel Release Handle is in the “Safe” Position |
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T Mk10, Mk20, 21 |
To Reinforce Oil Tank Mounting Feet (Interim Scheme Pending Modification H.81) |
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To Improve the run of the Flexible Drive for Tachometer Generator and Introduce Redesigned Fairlead |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Spinner A.66870 for Propeller in Lieu of A.66709 (Superseded by Modification H.190) |
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T Mk10, Mk20, 21 |
To Introduce an Improved Tapered Actuating Rod in Brake Actuator in Lieu of Shouldered Type |
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T Mk10, Mk20, 21 |
To Strengthen Nose Cowl Lugs |
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To Introduce Larger Diameter Pulleys on Rudder Control System in Front and Rear Fuselage and Reduce Circuit Tension |
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To Alter Shape of Slots for Clips in Undercarriage Leg Fairing (Superseded by Modification H.130) |
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To Improve Method of Welding on Tailwheel Fork |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce a Test Point in Vacuum System at Rear of Instrument Panel |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Oil Tank with Improved Method of Attachment and Larger Diameter Filler Neck |
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To Introduce Redesigned Support Bracket for Engine Speed Generator Mounting. Part A: Mod. to Existing Bracket for Retrofit. Part B: New Bracket for Production and Replacement |
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T Mk10, Mk20, 21, 22, 22A |
To Delete Attachment for Oil Cooler Inlet Duct at Firewall |
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To Introduce Redesigned Mounting for Socket for Ground Electrical Services |
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To Introduce Electric Starter in Lieu of Coffman |
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T Mk10, Mk20, 21, 22, 22A |
To Separate the Oil Drain form the Induction Manifold and to Improve the Induction Manifold Drain Pipe |
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To Strengthen Flanges of Drain Outlet Assembly at Firewall |
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To Introduce 12 Gallon Fuel Tanks |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Fireproof Fairlead for Cables at Firewall |
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To Introduce Steel Fairlead for Oil Pressure Capillaries at Firewall |
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To Introduce Vacuum Gauges in Both Cockpits |
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T Mk10, Mk20, 21, 22, 22A |
To Ensure Correct Adjustment of Undercarriage Torque Links Centre Hinge Joints and to Increase Diameter of Split Pin on Nut |
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To Introduce Redesigned Ratchet and Pawl for Brake Lever with Improved Hardening on Contact Faces |
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T Mk10 Mk21 |
To Introduce Vent Hole in Fuel Contents Gauge. CANCELLED |
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To Introduce Longer Oil Tank Vent Hose |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce a Strengthened Outer Elevator Hinge Bracket and Longer Attachment Bolts |
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To Introduce a Stop in the Control Box for Wheel Brake Actuating Lever |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Oil Cooler Blanking Plate |
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T Mk10 Mk20, 21 |
To Strengthen Top Nose Cowl Attachment |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Strengthened Two-Stage Flying Practice Screens. Part A: Fixed Fittings. Part B: Amber Screens |
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To Introduce Bonding on Airframe Control Surfaces |
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Not Allocated |
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Miscellaneous Amendment |
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To Introduce Extended Chord Rudder |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Pren Type Cables for Aircraft Electrical Services |
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To Reinforce Flange and Edge of Oil Cooler Air Scoop |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Watch Holder Stores Ref: 6A/1465 in Front & Rear Cockpits |
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To Improve the Hot and Cold Carburettor Air Intake Control |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Wiring to Provide Electrical Heating for the Pitot Head (Post-modification H.27) |
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To Introduce Two-Stage Blue Flying Practice Screens |
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T Mk10, Mk22, 22A |
To Introduce TR.1934 Aerial Type 228 in Lieu of TR.1936 and Aerial Type 226 (Superseding Modification H.36) |
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To Introduce Plessey PTR61 Mk.2 VHF Radio with Dual Control |
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T Mk10, Mk20, 21, 22, 22A |
To Correct External Fuel Markings Adjacent to Filler Cap |
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Part A: To Introduce 1 Gallon Drinking Water Tank with Fixed Stowage. Part B: To Introduce Stowage for Signalling Strips |
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Mk21 Only 2 ac for King’s Cup Air Race |
To Introduce Long Range Fuel Tank |
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To Introduce an Additional Ratchet Plate to “Double up” the Bearing Surface for Pawl on Flap Lever |
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To Introduce a Strengthened Bolt Plate for Engine Mounting at Stabilising Struts |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce a Hole in Nose Cowl for Rocker Box Cooling |
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To Introduce Heavier Gauge Rear Tubular Member on Canopy Frame |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Strengthened Pulley Mounting Bracket in Fuselage for Flap Controls |
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To Replace Light Alloy Bracket by Steel for Strut Attachment at Tailplane Rear Spar |
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T Mk10, Mk20, 21, 22, 22A |
To Decrease the Pitch of Rivets for Stringers in Top Skin of Main Plane in Area Directly Outboard of Tank Bay |
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To Introduce Redesigned Rear Roller Attachment Bolt and Washer for Canopy (Partly Superseded by Modification H.182) |
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T Mk10, Mk20, 21, 22, 22A |
To Delete Spring-loaded Non-return Valve Part. No.s SPE170 from Fuel System Replace by SPE1183 (Non-Spring-Loaded Type) (Superseded by Modification H.165) |
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T Mk10, Mk20, 21, 22, 22A |
To Strengthen the Attachment of Rudder Fairings and Tail Cone |
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To Reposition Fuel System Non Return Valves to Improve Accessibility |
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To Introduce ‘Investment’ Cast Flange for Exhaust Manifold |
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T Mk10, Mk20, 21, 22, 22A |
To Prevent Fixing Bolt Rotating in Torque Link Lugs on Undercarriage |
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To Introduce Stiffened Rudder Pedal |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce a Redesigned Undercarriage Compression Leg Fairing |
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To Reposition Ground/Flight Switch |
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T Mk10, Mk20, 21, 22, 22A |
To Redesign Attachment of Knurled Nuts at Top of Dashboard |
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To Reinforce Canopy Rear Tubular Member (for Retrospective Application Pending Introduction of New Canopies to Modification H.119) |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Shock Absorber for Tailwheel |
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To Introduce Improved Method of Adjustment for Friction Device in Tailwheel. Part A: Using Existing Spindle. Part B: Using Longer Spindle |
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T Mk10, Mk20, 21, 22, 22A |
To Provide a Strengthened Tailwheel Yoke & Provide Increased Clearance at Tail Cone |
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To Reduce the Maximum Quoted Diving Speed from 173 to 155 knots |
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To Introduce Improved Type of Fuel Tank Vent (Superseded by Modification H.207) |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce a Stiffener at Fuel Filter Mounting on Firewall (Superseded by Modification H.181) |
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To Introduce Switch Type 896 (with spring loaded toggle) in Lieu of Switch Type 170 in “Press to Mute” Circuit in VHF Rear Control Box. CANCELLED |
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T Mk10, Mk20, 21, 22, 22A |
To Obtain more Clearance for Rudder Bar Throughout its Movement to Avoid Rudder Jamming |
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To Reposition Oil Pressure Gauge Capillaries from Engine to Bulkhead |
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To Introduce Plessey Fireproof Cover for Cartridge Starter |
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To Introduce Suppressor Type Y1 in Lieu of Type H No.2 |
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To Introduce Protective Covers for Wheels |
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To Improve Attachment of Lower Engine Support Fittings to Fuselage. Part A: Retrofit. Part B: Present Production using Countersunk Parts. Part C: Future Production using New Parts. |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce 1.0” Wide Lassovic PVC Adhesive Tape to Fuselage in the Vicinity of Wing and Empennage Fairings |
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To Introduce Wire Mesh Screen and Retaining Unions in Suction Line of Vacuum System |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Redesigned Elevator Central Hinge Fitting with Bosses and Centre Bolt in Lieu of Pin. Part A: Retrofit. Part B: Production |
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To Prevent Draught Entering Rear Cockpit |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Improved Assembly of Flap Operating Link |
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To Introduce Marker Beacon BC.1033 and Range Receiver BC.453 |
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To Introduce Downward Identification Lamp Type ‘D’ (Amber) on Port Side of Aircraft and Delete Existing Lamp from Starboard Side |
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To Introduce Fixed Parts for STR 9x 10 Channel VHF Radio |
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To Introduce Removable Parts for STR 9x 10 Channel VHF Radio |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Mounting Assembly Type 873/2 and Improve Clearances around VHF Radio (when 10 Channel VHF is fitted) |
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To Continue the Existing Slot in the Canopy Rail though the Rear Fairing |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Suction Connection Type D Stores in Lieu of Type A for the Turn and Slip Indicator |
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To Insulate Soldered Tags for Bulb Holder in VHF Control Box |
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Mk21, 22, 22A |
Additional Night Flying Equipment to Meet ARB Requirements |
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To Introduce Air Speed Indicator Smiths Type 167.AS Calibrated 30 - 210 Knots in Lieu of Type 159.AS 20 – 210 Knots |
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Mk20, 21, 22, 22A |
Part A: To Introduce Patch Plates for Cut-Outs on Spinner. Part B: To Introduce Clearance Holes to Spinner Nose and Adhesive Tape to Base |
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To Introduce Redesigned Bracket for Rudder Bar with Improved Ball Race Housing |
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To Introduce Smiths Fuel Gauge 1632 FG Fitted with Luminous Dial FG 5024 |
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T Mk10, Mk20, 21 |
To Introduce Non-return Valve Type SPE N375 Mk 1 in Lieu of Type SPE 1183 (Superseded by Modification H.199) |
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T Mk10, Mk20, 21 |
To Reinstate Switch Type 170 in Press-to-Mute Circuit |
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To Introduce a Stronger Internal Reinforcing Bracket and Internal Gusset Plate on Tailplane at Shock Absorber Strut Attachment |
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To Introduce Hoffman Self-Aligning Bearing N.1156 in Lieu of SKF 13303 in Elevator Connecting Rod (under rear seat) |
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T Mk10, Mk20, 21, 22, 22A |
To Ensure Correct Adjustment of Brake Levers |
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To Improve the Attachment of Aileron Sprocket to Vertical Pivot Tube |
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T Mk10, Mk20, 21, 22, 22A |
To Substitute Shackle Pin in Lieu of Bolt at Front Pilots Shoulder Strap Attachment |
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To Obviate Chafing Between Canopy Leading Edge and Windscreen Mask |
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T Mk10, Mk20, 21, 22, 22A |
To Change Front Canopy Rollers to Sliding Blocks |
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To Introduce Range Receiver BC.453 |
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Miscellaneous Amendment |
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T Mk10, Mk20, 21 |
To Introduce a Spring Over-riding Device in Brake Control Circuit. CANCELLED |
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T Mk10, Mk20, 21, 22, 22A |
To Provide Close Tolerance Bolt in Lieu of Standard at Front Wing to Fuselage Joint |
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To Introduce Reinforcing for Fin Post (when Mod H.104 is Embodied) (53 ac only) |
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T Mk10, Mk22, 22A |
To Introduce Transfer for External and Internal Markings |
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T Mk10, Mk20, 21 |
To Introduce Improvements in Brake Circuit to Actuators |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Improved Method of Mounting Fuel Filter |
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To Introduce a Square Slide in Lieu of Roller at Rear of Canopy |
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To Provide Additional Treatment and Drainage Holes for Flap Inner Hinge Brackets |
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T Mk10, Mk22, 22A |
To Introduce Turn & Slip Indicator Ref: 6A/3371 in Lieu of 6A/2676 |
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To Introduce an Improved Distance piece at Aileron Outer Hinge |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Nose Cowl Reinforcing |
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To Introduce Reinforcing on RH Corner of Cowling Undershield |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Fuel Feed Pipe in Tungum in Lieu of Aluminium Between Cock & Fuel Filter |
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To Introduce Compass Deviation Card Holder Mk 4 in Lieu of Mk 3 |
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T Mk10, Mk20, 21 |
To Introduce Spinner A.66912 Mk 5 in Lieu of A.66870 Mk 4 |
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To Introduce a Loading Label in Luggage Locker |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Guard over Muting Switch on Radio Control Box in Rear Cockpit |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Improvements in Carburettor Heater System |
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To Introduce Shorter Distance tubes for Front Engine Mounting Shear Rubber Assemblies |
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To Introduce Modified Engine Mounting with Improved Bearing Face for Front Shear Rubber |
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To Introduce Plessey PTR 61F 6-Channel VHF Radio with Associated Controls and Wiring (replaces Mod. Chipmunk H.112) |
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Gliding Towing Gear – To Introduce Glider Towing Facilities (See also H.121 & H.167) |
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T Mk10, Mk20, 21, 22, 22A |
Mainplane: To Improve Fixing of Fabric to Wing |
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Fuel System: To Introduce Improved Non-return Valve SPE 1957 in Lieu of SPE 1747 |
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T Mk10, Mk20, 21, 22, 22A |
Oil System: To Introduce Improved Washer for Oil Tank Filler Cap |
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T Mk10, Mk20, 21 |
External Marking: To Introduce 82 Avgas Fuel and Markings (supersedes H.113) CANCELLED |
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To Introduce Modified Instrument Panels for Uruguayan Air Force |
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To Introduce Labels in Spanish for the Uruguayan Air Force. CANCELLED |
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T Mk10, Mk20, 21 |
Electrical: To Introduce Two Unipren 6 Cables in Lieu of Dupren 6 Cable. CANCELLED |
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To Permit the use of 9 Gallon Fuel Tanks in Lieu of 12 Gallon on Conversion from T Mk10 to Mk21. CANCELLED 10.09.54 |
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T Mk10, Mk20, 21, 22, 22A |
Engine Controls: To Introduce Redesigned Throttle Rods |
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Fuel System: To Introduce Balance Type Vents (supersedes H.138) |
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T Mk10, Mk22, 22A |
Electrical: To Introduce Sea Grey Plastic Caps on Single Pole Switches in Cockpit |
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Radio: To Introduce Flexibly Mounted Aerial |
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Mk20, 21 22, 22A |
Fuel Vent: To Introduce a Deflector on Rear Fuselage Underside to Prevent Fuel Entering Cockpit through Access Door |
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Mk20, 21 22, 22A |
Electrical: To Introduce Suppressor Type Y1 in Lieu of Type H No. 2 |
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T Mk10, Mk20, 21, 22, 22A |
Fuel Vent: To Seal the Vent Fairing to Pre-vent possible Entry of Fuel Draining from Vent Pipes into Fuselage After Flying Inverted |
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Fuselage: To Introduce Engine Data and No Smoking Labels, Name Plate and Weight Schedule |
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Cockpit: To Prevent Brake Lever from Fouling Pilots Leg (Incorporating DOI 14484) |
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Braking System: To Introduce Header Tank and Pipe Line. Cancelled by H.245 |
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Engine Installation: To Prevent the Possibility of Gaps Between Firewall and Fuselage |
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T Mk10, Mk20, 21, 22, 22A |
Fuel System: To Introduce Socket for Latest Bowser Bonding Plugs |
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Elevator: To Introduce Strengthened Nose Ribs at Outer Hinge |
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Vacuum System: To Introduce a Vacuum Gauge on Front Cockpit Dashboard |
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Fuel System: To Modify Fuel Gauge with New Dial and Luminous Markings for Night Flying |
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Cartridge Starter: To Introduce Type ‘SA’ Breech in Lieu of Type ‘S’ |
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T Mk10, Mk20, 21, 22, 22A |
Ground Equipment: To Introduce Modified Incidence Board for Tailplane |
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Rear Fuselage: To Introduce Improved Attachment to Tailwheel Yoke |
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Mk21, 22, 22A |
Cartridge Starter: To Introduce ‘SA’ Breech and Flameproof Cover in Lieu of ‘S’ Breech and Flameproof Cover CK3896 |
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Tail Unit: To Introduce Strengthened Extension Piece Rudder Torque Tube |
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Radio: To Introduce Mic-Tel Connector Type 10318 to TR.1920 and TR.1520 Radio Installation. CANCELLED |
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Electrical: To Introduce Flashing Navigation Lights. CANCELLED |
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Electrical: To Improve Bonding of Rudder to Fuselage |
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All Series & T Mk10 |
Wing Root Rib: Improvement at Flap Operating Pulley Housing Mounting |
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Tailplane Rear Spar: To Increase Chamfers on Elevator Hinge Brackets |
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To Introduce Anti-spin Strakes to Rear Fuselage |
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Engine Controls: To Introduce Re-designed Spring for Throttle and Altitude Control Rod End (pre and post modification H.206). Not used. See Modification H.236 |
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Fuel Tanks: Improved Water Drainage |
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All Series Except T Mk10 |
To Introduce Shouldered Bolt at Pivot Points on Rudder Bars for Inter-Connecting Rod |
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To Provide Artificial Horizon 6A/1498, 6A/3290 or 6A/3827 as Alternatives to 6A/1519 |
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Engine Controls: To Delete Alternative Ball Joint, Spring and Cup on Engine Throttle Control Rod |
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T Mk10, Mk22, 22A |
Fuel System: To Mark Direction of Flow on All Pipe Lines and on Components where Incorrect Assembly of Components is Possible |
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To Introduce Agricultural Chipmunk Mk 23 |
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To Introduce Spray Gear for Chipmunk Mk 23 |
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All Series Except T Mk10 |
To Introduce Check Cable at Position of Flap Control Return Spring |
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To Introduce Additional Stiffening at Forward Fuselage Side Panels |
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All Civil Series & T Mk10 |
To Introduce Revised Battery Drain Pipes |
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Introduction of Modified Crop Spraying Gear (G-APOS only) |
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To Introduce Shorter Snubber For Rear Engine Mounting Shear Rubber Assemblies |
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Brake System: To Reposition Header Tank and Piping Forward of Firewall (Cancels H.215) |
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Engine Installation: To Introduce Slow Running Cut-out |
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To Introduce Revised Position of Propeller Relative to Crank Webs |
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All Series T Mk10 |
To Revise Attachment Bolt at Flap Hinge Fitting at STN 60 |
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Mainplanes: Introduction of Steel Wing Root Fittings. CANCELLED |
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Electrical: To Introduce Re-routed Wiring to Pitot Head Heater in Port Mainplane |
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T Mk10, Mk20, 21, 22, 22A, 23 |
Elevator Rear Layshaft: Introduction of Improved Stops |
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Firewall: To Introduce Packings Under Oil Tank Supports |
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Fuselage: To Introduce Bristol Canopy with Bristol Flap Modification. CANCELLED |
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Engine Cowling: To Introduce Glass Fibre Lower Nose Cowl Section Part No. FRDA 52473 in Lieu of Metal Lower Nose Cowl Section Part No. C1-EC 79A/2 |
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Civil Series T Mk10 |
Elevator Rear Layshaft: To Introduce Strengthen Bracket Part No. C1-CF 563A/2 in Lieu and By Conversion of C1-CF 563A/1 |
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Miscellaneous: To Introduce Revised Fire Extinguisher. Cancelled and Replaced by Modifications H.258 & H.259 |
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Wireless Equipment: To Introduce Lightweight UHF TR ARI 18197/1. Cancelled and Replaced by Modification H.263 |
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To Delete Stowage for Two-Stage Amber Screens |
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To Make Provision for and Introduce Fire Extinguisher 27N/299 in Lieu of 27N/12 and Bracket 27N/149 in Lieu of 27N/13 (Supersedes H.256) |
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Undercarriage: To Introduce Mainwheel Part No. AH.51981 in Lieu of AH.9389 |
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All Civil Series & T Mk10 |
Controls: To Introduce Latch Plate Part No. C1-CF 1489 in Lieu of Latch Plate PC. No. C1-CF 1133A for Flap Control Lever (Superseded by H.272 then H.273) |
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Engine Mounting: To Introduce Larger Vent and Drain Holes in Tubular Structure. Part A: New Spares. Part B: Retrospective Action |
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Wireless Equipment: To Introduce PTR170 Radio in Lieu of Existing VHF |
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All Civil Series & T Mk10 |
Controls: To Introduce Eye-end Adjuster Screw C1-CF 1491 and Turnbuckle C1-CF 1493 in Lieu of Eye-end Adjuster Screw C1-CF 1169 and Turnbuckle AS.2906 on Wheelbrake Control Cable |
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Instrument Installation: To Introduce and Make Provision for Mk.14 Fatigue Meter 6A/6487 and Air Speed Switch |
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Fire Extinguisher: To Introduce a Guard Plate Over the Quick Release Mechanism of Fire Extinguisher Mounting Bracket Type 27B (Graviner) |
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All Series & T Mk10 |
Alighting Gear: To Introduce Tailwheel Shock Strut Part No. C1-UT-189A in Lieu of C1-UT-131A. |
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Fuselage: To Introduce HTS Gusset Plates in Lieu of Aluminium Alloy Gussets at the Top Centre Structure of Front Fuselage |
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Aerofoils: To Introduce HTS Pins in Lieu of Aluminium Alloy Rivets for Securing the LH & RH Elevator Interconnecting Flanges to Torque Tubes |
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Alighting Gear: To Introduce Special Bolt Part No. C1-UT-197 in Lieu of C1-20-UT9 on Tailwheel Yoke Assembly |
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Miscellaneous: To Introduce Special Fluorescent Paint Scheme for Royal Navy Chipmunk T Mk.10 Aircraft |
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Controls: To Introduce Revised Latch Plate and Quadrant. Modification CANCELLED see H.273 |
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T Mk10, Mk22, 22A |
Controls: To Introduce Flap Control Lever Quadrant Assembly Part No. C1–CF 731A/2 in Lieu and by Conversion of C1-CF 731A/1 |
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Fuel System: Installation of Fuel Filter Type LF1/3 (Hymatic). CANCELLED |
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Alighting Gear: To Introduce Special Bolt Part No. C1-UT 199 in Lieu of Standard Bolt A.25-66G on Tailwheel Yoke with Glider Towing Attachment |
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To Introduce Tailcone Assembly Part No. C1-FS1801A in Lieu and by Conversion of Part No. C1-FS 647A/1 |
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Engine Installation: To Introduce Rear Manifold Assembly Part No. C1-E99A/ND and Clip Part No. C1-EE 101 in Lieu of Rear Manifold Assembly Part No. C1-EE 81A/ND. Part A: New Manufacture. Part B: Retrospective Action |
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Fuselage: To Introduce Tailcone Assembly Part No. C1-FS 1871A/ND in Lieu and by Conversion of Part No. C1-FS 158A/ND |
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Alighting Gear: To Introduce Mainwheel AH51981 in lieu and by Conversion of AH9389. Dunlop Modification 4179. CANCELLED |
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T Mk10, Mk22, 22A |
Controls: To Introduce Cable Guard Part No. C1-CF 1507A in Lieu of Cable Guard Part No. C1-CF 1171 |
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To Introduce Reinforced Ribs and Modified Rib to Front Spar Attachment Angles in Centre Tailplane Structure |
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Fuselage: To Introduce Attachment of Fire Extinguisher Mounting Bracket |
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Civil Series T Mk10 |
Fin: To Introduce Rib Support Angle C1-TF 101A in Lieu of C1-TF 35A. Part A: New Production. Part B: Retrospective Action |
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Fuselage: To Introduce a Strengthened Lower Portion of Former No. 1 Part No. C1-FS.1821 in Lieu of C1-FS 319 |
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T Mk10, Mk22, 22A |
Engine Installation: To Re-run the Slow Running Cut-off Cable and Re-position the Pull Ring Mounting Bracket. Part A: Pre Mod H.263. Part B: Post Mod H.263 |
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Oil System: To Introduce Oil Tank Part No. C1-LT 347A in Lieu and by Conversion of C1-LT 323A |
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Not Allocated |
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Fuselage: To Introduce a Steel Tie Bar in Lieu of a Light Alloy Tie Bar at Bottom Boom of Centre Section Spar |
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Aerofoils: To Introduce Steel Wing Root Insert Fittings in Lieu of Light Alloy Fittings at Bottom Boom of Wing |
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Aerofoils: Replacement of Inboard Portion of Lower Spar Boom |
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T Mk10, Mk22, 22A |
Electrical Equipment: To Introduce a Remote trimmer Resistance Ref: No. 5UC/5210 in Lieu of 5UC/5780 in the Voltage Regulator Circuit |
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Fuselage, Cockpit: To Make Provision for Restraint Harness Part No. MRI-GQ716 in Front Cockpit and MRI-GQ729 in Rear Cockpit in Lieu of 6F/246 (Front) and 6F/245 (Rear) |
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Airframe: To Introduce Modified External Paint Scheme |
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T Mk10, Mk20, 21, 22, 22A |
Aerofoils: To Introduce Rudder Part No. C1-TR 157A/2 in Lieu and by Conversion of C1-TR 157A/1 |
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Aerofoils: To Introduce Elevator Part No. C1-TE-1/3 in Lieu and Conversion of C1-TE-1/2 and C1- TE-2/2 |
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Controls: To Introduce Rear Rudder Bar Assembly Part No. C1-CF 69A/4 in Lieu and by Conversion of C1-CF 69A/3 |
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Engine Installation: To Introduce Adjusting Sleeve Part No. C1-E573 in Lieu of Part No. C1-E 162 for Engine Mounting Rear Foot |
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Miscellaneous: To Introduce Improved Protection to the Fuselage Battery Compartment. Withdrawn in Favour of H.309 |
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Engine Installation: To Introduce Revised End Connections for Carburettor Hot/Cold Air Control Cables |
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External Finish: To Introduce Revised External Colouring and NATO Markings for Royal Navy Aircraft (superseding Mod H.271) |
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Flying Controls: To Introduce Larger Diameter Pulley Part No. C1-CF.271 for Flap Control Cable at Wing Root Rib |
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T Mk10, Mk22, 22A |
Engine Installation: To Reposition the Engine Speed Indication Generator (A/780) to Provide Improved Routing of Flexible Drive (6A/1504) (Superseding Mod H.82 for Mk.10) |
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To Introduce a Warning Indication of Starter Relay Failure (Post H.85) |
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Electrical: To Introduce Battery Type J Ref No 5J/9496080 in lieu of Type C ref no 5J/3200. Superseded by Modification H.309 |
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To Introduce 2 Monobloc Battery Sections (Varley Part No. 12 19/25) in Lieu of Batteries Type C |
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T Mk10, Mk20, 21, 22, 22A |
Flying Controls: To Introduce Rudder Control Hinge Bracket Part No. C1-TF 71/1 in Lieu of C1-TF 71 |
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External Finish: To Introduce Revised External Colour Scheme (Red/White/Grey) |
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Electrical: Introduction of Revised Wiring. CANCELLED |
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T Mk10, Mk22, 22A |
Fuselage Structure: To Make Provision for and Introduce Battery Type J in Lieu of Battery Type C by Extending the Battery Compartment (Enhanced Version of Civil Modification H.305) |
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Wings: To Introduce Undercarriage Leg Mounting Casting Part No. C1.W 1023 and C1.W 1024 in Lieu of Part No. C1-W 639 and C1-W 640 |
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T Mk10, Mk22, 22A |
Fuel System: To Introduce Drain Valve Vickers Type A.5268 Mk.B in Lieu of Plug Part No. 4 PT 123 for the Fuel Tank Sump Drain |
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Fuselage: To Introduce Reinforcement to Former at Lower Cowling Attachment Bracket (Post Modification H.284) |
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T Mk10 RN Only |
Radio: Introduction of PTR 170 UHF. Covered by Modification H.263 |
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Mk20, 21, 22, 22A |
To Introduce Hoffmann Wood Propeller Part No. HO 21HM 198B/140L, Spinner Part No. FP 3037 and Back Plate Part No.3038 in Lieu of Fairey Metal Propeller etc. |
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Miscellaneous: To Introduce a Guard for the Rear Cockpit Ignition Switches |
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Radio: To Introduce Connector Type 10318 for Mic-tel Headsets and to Delete Redundant Socket Type 359 |
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Mk22, for ac C1-0001 only |
To Introduce New Tailwheel Two-track Tyre (Part No. Dunlop DA 2435) in Lieu of Existing Part No. DS 13420 |
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Introduction of Shell Fuel Carnet Holder. Requirement Withdrawn by MOD |
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Miscellaneous- To Introduce Accelerometer to Front Cockpit Coaming |
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Fuselage – To Make the Glider Tow Facilities Quickly Detachable |
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Introduce Collins 618-1C VHF Radio Equipment in Lieu of Type STR 9X Equipment |
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Engine Installation: To Introduce Angled Fairlead Pt No C1-E585A in lieu of Straight Fairlead Pt No C1-E575A for ESI Flexible Drive. Incorporated with Modification H.302 |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Aerobatics and Spin Prohibited Label (Pre-Modification H.231) |
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To Introduce Spin Recovery Advisory Label (Post-Modification H.231) |
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T Mk10, Mk22, 22A |
To Introduce Pitot-static Pipe Clipping in Rear Cockpit |
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To Introduce Structural and Electrical Changes to Modification H.321 To Suit Aircraft C1-0557 |
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Radio: To Introduce a Press-to-Mute Facility in the Front Cockpit |
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T Mk10, Mk22, 22A |
To Introduce Velcro Fastening to Ends of Adjustable Shoulder Straps in Lieu of Stitching |
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To Introduce Bendix RT 221 with VHF TR 1936 B Retained |
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Beacons: To Introduce Whelen Strobe–type A413 HD Anti-Collision Light |
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Mk22 (G-BARS) |
To Introduce Collins 20 VHF Radio Equipment in Lieu of 618F-1C Equipment |
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To Introduce VHF Communications Equipment Marconi AD120 in Lieu of Existing TR 1900 Series Equipment |
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External Finish: To Introduce Colour Coding and Symbols at Fuel Filler Cap Positions and Revised Colours for Propeller. CANCELLED. |
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To Introduce I/C-R/T Switches on Control Columns |
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To Introduce UHF Stand-by Radio D403 (ARI 23159). Part A: Fixed Fittings. Part B: Removable Fittings |
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T Mk10, Mk22, 22A |
Fuselage: To Introduce Cockpit Heating by the Installation of Warm Air Ducting |
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Radio: To Introduce Plessey PTR 1751 ARI 23301/26 UHF in Lieu of PTR 170 ARI 18197/1 UHF |
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T Mk10, Mk22, 22A |
To Introduce Acrylic Paint Finish to DTD 5599A on External Metal Surfaces |
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Flying Controls: To Introduce Flap Control Cables Part Nos. SP 53-0570-16, SP 53-0520-23 and SP 530520-20 25 in Lieu of Part Nos. AS 1387-16, AS 1406-23 and AS1406-20 |
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T Mk10, Mk22, 22A |
To Introduce and Make Provision for Battery Type J Ref: 5J/65466954 in Lieu of Battery Type J Ref: 5J/3496080 and to Introduce Vent Adaptor Banjo |
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T Mk10, AAC ac WP983 & WZ884 only |
To Introduce and Make Provision for a Mk. 14 Fatigue Meter and Air Speed Switch (6A/446 4239) and Air Speed Switch (6A/11453) |
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To Introduce Cleveland Wheels and Brakes in lieu of Dunlop Items. CANCELLED by the MOD |
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To Introduce an Extended Front Cockpit Coaming (Concurrent with Mod. H.337). CANCELLED |
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To Introduce Chelton Broad Band UHF Antenna Type 16-1 (Ref: 10B/2222-399) in Lieu of McMichael UHF Aerial Type |
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To Introduce an Aerial Bonding Post in the Starboard Wing (Complementary to H.332) |
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Undercarriage: To Introduce Revised Dunlop Brake Units. Withdrawn by MOD |
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To Introduce Top Rear Canopy Rail Part No. C1.FC.817 in Lieu of C1.CF.623 and Side Rails Part No. C1.FS.1905-6 in Lieu of C1.FS.621-2 (Future Spares Only) |
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Fuel System: To Introduce Replacement Fuel Filler Cap Retaining Chain. CANCELLED by MOD |
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To Delete the Induction Manifold Heater Pipes and Blank Off Exhaust Manifold. Part A: RN ac Pre-Mod. H.336, Civil ac Pre-Mod. H.354. Part B: AAC/RAF ac Post Mod. H.336, Civil ac Post-Mod. H.354 |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Safety Catch for the Fuel Cock Control Lever (Front Cockpit Only) |
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Undercarriage: To Introduce Torque Plate AHM8280 (Dunlop Mod. M1540) |
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To Introduce Rudder Pedal Assembly C1-CF 1537A and 1538A in Lieu and by Conversion of Assembly C1-CF 1373A |
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To Make Provision for Carriage of 2 Spare Parachutes and Helmets |
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Fuselage: To Introduce Cockpit Heating by the Installation of Warm Air Ducting |
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To Introduce New Control Cables for the Cockpit Heating. Incorporated with Modification H.336 |
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T Mk10, Mk22, 22A |
Fuselage: To Introduce “No Step” Markings on the Cockpit Control Box Covers |
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T Mk10, Mk20, 21, 22, 22A |
To Introduce Tailplane Attachment Fitting Part No. C1-TP 313 in Lieu of Fitting C1-TP 167 |
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Fuselage: To Introduce Reinforcing Plates at the Upper Engine Mounting Attachment Points |
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T Mk10, Mk20, 21, 22, 22A |
Mainplanes: To Introduce Inspection Access Holes Adjacent to the Undercarriage Mounting |
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To Introduce Reinforcing Strips to Each of the Flanges of the Fin Rear Spar: Part A: Aircraft Pre- mod H.178. Part B: Aircraft Post-mod H.178 |
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To Withdraw Aircraft Serial Number Markings from Underside of Wings. CANCELLED by MOD |
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Radio: To Introduce Plessey PTR 1751 UHF in Lieu of PTR 170 UHF (ASR 889) |
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T Mk10, Mk22, 22A |
Fuselage: To Introduce a Sealing Gasket CIFS 1909 ND at the Brake Cylinder Access Panel. Access Panel Part No. CIFS 1079 ND Becomes CIFS 1907A |
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Instruments: To Introduce Air Path Type C 2400-L4PS Compass in Lieu of Compass Type E2B on the Cockpit Coaming |
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Communications: To Make Provision for and Introduce UHF Radio ARI 23301/56 (25KHz) in Lieu of and by Conversion of UHF Radio ARI 23301/26 (50 Khz) |
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Electrical: Cover modification for repair of Generator to Suppressor Cable Part No. C1-N177A. See SEM/Chipmunk/20. No leaflet issued. |
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Communications: To Introduce VHF Radio AD 120 in Lieu of UHF Radio PTR 170 and Standby Bendix VHF |
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Electrical: To Introduce GatesVarley Sealed Lead Acid Battery Part No. 9750-0741 in Lieu of Varley J Type Battery Part No.V2092 |
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Communications: To Introduce Becker Radio AR3201-(1) VHF Radio in Lieu of Type STR 9X Equipment |
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Communications: To Introduce UHF Radio ARI 23291/12 (25KHz) in Lieu of UHF Radio ARI 2391/2 (50KHz) |
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T Mk10 (RAF & AAC) |
Electrical: To Introduce Conspicuity Strobe Lights on the Wing Tips. Part A: Fixed Fittings in Mainplanes. Part B: Fixed Fittings in Fuselage. Part C: Removable Equipment – Hella HISL, Power Supply and Wiring |
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T Mk10 (RN only) |
Communications: VHF Radio – To Introduce Wiring Changes Necessary to Permit Dual Installation (AD 120/RT221) |
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Electrical: Battery – Concord batteries CB 12-9 (2 off) Fitted in Lieu of Batteries Type J (Mod H.309) |
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Flying Controls: Flaps – To Introduce a Revised Method of Assembly for the Flap Control Cable Swivel Pulley Installation at the Wing Root |
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Flying Controls: Flaps – To Introduce a Revised Method of Assembly for the Flap Control Cable Swivel Pulley Installation at the Wing Root |
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TMk10, Mk22, 22A |
Instrumentation: To Introduce Fuel Contents Gauge PW1335FG in Lieu and by Conversion of Type LV1335FG. Cover Mod for Smiths Mod SIB 1671 |
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To Introduce Rotax Electric Starter in Lieu of Coffman Cartridge Starter |
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T Mk10, Mk 20, 21, 22, 22A, 23 |
Undercarriage: To Introduce Undercarriage Piston Tube C1-U-179A in Lieu of Piston Tube C1-U-55 |
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Communications: Relocation of Disable Switch for PTR1751BB Radio (SRIM 4223) |
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Conversion of T Mk10 ac to Mk 22/22A. CANCELLED |
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Fuel Management: To Make Provision for and Introduce 24 Gallon Fuselage Tank (Part No. C1-Z- 1673A), Associated Piping and Valves. |
