Commonwealth legislation

AD/DHA-3/19 - Fuselage - Installation of Strengthened Support Brackets - Lower Centre Engine Mounts

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

2/10 complexity

What this does: This is an Airworthiness Directive—a legally binding safety order issued by the Civil Aviation Safety Authority (CASA). It mandates an urgent structural repair to prevent engine mount failure.

Who it affects: Owners and operators of all models of the DHA-3 (Drover) series aircraft.

What must be done: You must install strengthened support brackets on the lower centre engine mounts in the fuselage. The work must follow one of these technical manuals:

De Havilland Technical Notes Service (TNS) document CT(A3) No. 107; or
De Havilland Modification DRO 98

When: Immediately ('Forthwith'). This means the aircraft cannot legally fly until the modification is complete.

Why it matters: Without these strengthened brackets, the engine mounts could fail, potentially causing an engine to separate from the aircraft or leading to catastrophic structural damage.

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Current sections

Direct links to the current provisions in AD/DHA-3/19 - Fuselage - Installation of Strengthened Support Brackets - Lower Centre Engine Mounts.

AD/DHA-3/19 - Fuselage - Installation of Strengthened Support Brackets - Lower Centre Engine Mounts

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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 DHA-3 (Drover) Series Aeroplanes

AD/DHA-3/19 Fuselage - Installation of Strengthened Support

Brackets - Lower Centre Engine Mounts

5/58

Applicability: All models.

Document: 1. DH TNS CT(A3) No. 107; or

DH Mod. DRO 98. Compliance: Forthwith.

Source text

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