Commonwealth legislation

AD/HU 369/56 - Auxiliary Fuel System - Modification

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legislative instrument

Plain English Summary

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This airworthiness directive requires operators of helicopters fitted with the Chadwick C-20 auxiliary fuel system (installed under STC SH129WE) to fit a cockpit placard warning that only half the auxiliary fuel is usable if one pump fails and to install a Chadwick flow‑monitor kit. It matters because manufacturer tests show losing one auxiliary pump leaves only half the usable aux fuel with no onboard warning. Owners/operators pay for and must schedule the installations within short, specified timeframes to manage that risk.

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AD/HU 369/56 - Auxiliary Fuel System - Modification

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/56 Auxiliary Fuel System - Modification 3/83

Applicability: All models with Chadwick C-20 auxiliary fuel system installed per supplemental type certificate SH129WE.

Requirement: Part 1: Install placard readily visible to the pilot in the cabin with the following annotation:-

WARNING “USABLE AUX. FUEL LIMITED TO HALF AVAILABLE QTY. AT T/O”

Part 2: Install Chadwick C-20-FM flow monitor kit.

Note: FAA AD 82-14-01 and Chadwick SB20-81-01 refer.

Compliance: Part 1: Within 10 hours time in service after 22 February 1983.

Part 2: Within 300 hours time in service, or 6 months after 31 March 1983.

The placard installed as per Part 1 above, may be removed, provided the revised flight manual supplement, Chadwick Auxiliary Fuel System C-20 dated 21 October 1981, is incorporated into the rotorcraft flight manual.

Background: Tests conducted by the auxiliary fuel system manufacturer have shown that the loss of one auxiliary tank fuel pump will result in only half the usable auxiliary fuel being available in flight. When such a failure occurs, no warning is provided.

Source text

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

1 AD/HU 369/56 - Auxiliary Fuel System - Modification