Commonwealth legislation

AD/DHE/1 - Accessory Drive Shaft - Modification to Provide Weak Neck

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

This Airworthiness Directive is a mandatory safety order applying to two specific vintage aircraft engine models: the De Havilland Gipsy Six II and Gipsy Queen II.

What it requires Before either engine can be lawfully installed in an aircraft, the accessory drive shaft must be modified to create a "weak neck" — a deliberately engineered weak point that acts like a mechanical fuse. If the engine seizes or encounters extreme resistance, this neck is designed to shear or break first, preventing catastrophic damage to the engine casing and other critical components.

How to comply The modification must be performed exactly according to one of three approved technical specifications:

DH Modification G1018
DH Modification G1079
ANO 106.1.7.0.1.1

Who is affected Aircraft owners, maintenance engineers, and repair stations handling these specific vintage De Havilland engines, typically found in historic aircraft such as the Dove, Heron, or Rapide.

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AD/DHE/1 - Accessory Drive Shaft - Modification to Provide Weak Neck

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source De Havilland Piston Engines

AD/DHE/1 Accessory Drive Shaft - Modification NK

to Provide Weak Neck

Applicability: Gipsy Six II and Gipsy Queen II. Document: 1. DH Mod. G1018; or

DH Mod. G1079; or 3. ANO 106.1.7.0.1.1.

Compliance: Before installation in an aircraft.

Source text

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