Commonwealth legislation

AD/DHC-6/2 - Fuel System Crossfeed Thermal Relief - 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This Act has been repealed and is no longer in force. It is retained for historical reference.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

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What it does: This Airworthiness Directive (AD) orders a safety modification to the fuel system on early model De Havilland DHC-6 Twin Otter aircraft. Specifically, it requires updating the crossfeed thermal relief system — a safety mechanism that prevents dangerous pressure or temperature build-up in the fuel pipes that transfer fuel between tanks.

Who it affects: Owners and operators of DHC-6 Twin Otter aircraft with serial numbers 1 through 14 (the first 14 planes built).

What you must do: Carry out the modification exactly as described in De Havilland of Canada Modification Bulletin 6/1032 before 1 September 1971.

Why it matters: The directive prevents potential fuel system failures that could arise from thermal expansion issues in the crossfeed lines, ensuring these early-model aircraft remain safe to operate.

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AD/DHC-6/2 - Fuel System Crossfeed Thermal Relief - 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 DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/2 Fuel System Crossfeed Thermal Relief - Modification

Applicability: All models with S/Nos. 1 to 14.

Document: De Havilland of Canada Mod. Bulletin 6/1032. Compliance: Before 1 September 1971.

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Source text

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