Commonwealth legislation

AD/DHC-1/4 - Undercarriage Torque Link Centre Hinge Joint - Modification

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

1/10 complexity

What this does: This directive mandates a safety-critical modification to the landing gear (undercarriage) of specific vintage aircraft. You must modify the centre hinge joint on the torque link—a component that helps the landing gear absorb shock and stay aligned during takeoff and landing.

Who it affects: Owners and operators of all English production models of the De Havilland DHC-1 Chipmunk series aeroplanes.

What you must do: Carry out the modification exactly as described in either of these technical documents:

DH Chipmunk Modification H.92; or
Air Navigation Order 105.1.14.15.5.4

When: Immediately (the term "forthwith" means without delay—there is no compliance grace period).

Why it matters: This prevents potential failure of the undercarriage hinge joint, which could cause the landing gear to collapse during takeoff or landing.

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AD/DHC-1/4 - Undercarriage Torque Link Centre Hinge Joint - Modification

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source De Havilland DHC-1 (Chipmunk) Series Aeroplanes

AD/DHC-1/4 Undercarriage Torque Link Centre Hinge Joint - Modification

Applicability: All English production models. Document: 1. DH Chipmunk Mod. H.92; or

ANO 105.1.14.15.5.4.

Compliance: Forthwith.

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Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.