Commonwealth legislation

AD/PA-25/14 - Fire Protection - Modification - Relocation of Primer Line

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This Act has been repealed and is no longer in force. It is retained for historical reference.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: Requires a safety modification to specific Piper Pawnee aircraft to reduce the risk of engine fires.

Who it affects: Owners and operators of Piper PA-25-235 aircraft (and variants) that have the standard cockpit heating system installed.

What must be done:

Re-route the fuel primer line so it no longer runs immediately behind the engine exhaust heat exchanger (muffler), OR
Replace the existing copper primer line with a steel line

Why it matters: The original design placed fuel lines dangerously close to hot exhaust components. If the fuel line leaked, it could ignite. Moving the line or using steel (which is more heat-resistant than copper) prevents this fire hazard.

Deadline: Aircraft had to be modified before 1 September 1971.

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AD/PA-25/14 - Fire Protection - Modification - Relocation of Primer Line

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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 Piper PA-25 (Pawnee) Series Aeroplanes

AD/PA-25/14 Fire Protection - Modification - Relocation

of Primer Line

Applicability: Model PA-25-235 and variants of that model.

8/63

Requirement: All Piper PA-25-235 aircraft fitted with the standard cockpit heating installation are to be modified by re-routing the fuel primer line from fuel filter to primer pump, P/N 64179-04, to divert this line from the area immediately behind the engine exhaust heat exchange (muffler). Figure 1 illustrates an acceptable means of compliance.

Alternatively, or in addition, replace the existing copper line by a steel line.

Compliance: Before 1 September 1971.

View image in the official source

Source text

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