Commonwealth legislation

AD/PORSCHE/3 - Valve Springs

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

What it does: Requires operators of Porsche PFM 3200 N01 and N03 engines to check cylinder‑head operating hours and replace valve springs that have accumulated more than 500 hours, following Porsche Service Bulletin N/105‑036. Compliance is required before further flight.

Who pays and who acts: Operators/owners bear the cost; licensed maintenance organisations must carry out the replacements. The directive was issued after a reported in‑flight engine failure attributed to a broken valve spring.

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AD/PORSCHE/3 - Valve Springs

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Porsche Piston Engines

AD/PORSCHE/3 Valve Springs 13/98 TX

Applicability: Porsche PFM 3200 N01 and N03 engines.

Requirement: To address a report of a broken valve spring resulting in a complete engine failure:

A: By reviewing engine records, determine the operating hours of the cylinder heads, and

B: in accordance with the instructions detailed in Porsche PFM 3200 Service Bulletin Number N/105-036, replace engine valve springs installed in cylinder heads which have a time in service greater than 500 hours .

Note: German LBA Airworthiness Directive AD 1998-436 refers.

Compliance: Unless previously accomplished; before further flight.

This Airworthiness Directive becomes effective on 19 October 1998.

Background: This directive has been issued to require the replacement of cylinder head valve springs which have been in service for greater than 500 hours. The requirement reflects a report of an engine failure in flight which resulted from a broken valve spring.

Source text

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

1 AD/PORSCHE/3 - Valve Springs