Commonwealth legislation

AD/PA-24/24 - Propeller Inspection and Operating Instructions

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

A safety directive for owners/operators of Piper PA‑24 Comanche aircraft with McCauley 2D36C14/78 KM‑4 propellers: within 25 flight hours after 29 Jan 1970, inspect blades for damage (10× magnifier), repair as needed, perform a dye‑penetrant crack inspection on each blade (hub to tip, no removal required), and install a placard warning pilots to avoid continuous descent operation between 2,250–2,550 RPM with manifold pressure below 15 inHg. This prevents propeller blade fractures and possible catastrophic loss of control.

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Current sections

Direct links to the current provisions in AD/PA-24/24 - Propeller Inspection and Operating Instructions.

AD/PA-24/24 - Propeller Inspection and Operating Instructions

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Piper PA-24 (Comanche) Series Aeroplanes

AD/PA-24/24 Propeller Inspection and Operating Instructions 2/70

Applicability: Model PA-24 fitted with McCauley 2D36C14/78 KM-4 propellers.

Requirement: 1. Visually inspect blades for damage with the aid of a 10 power (2 1/2X) glass for defects such as erosion, scratches, nicks, cracks, etc. Rectify as necessary. After rectification dye penetrant inspect the entire blade from hub to tip.

Note: This work can be performed without removing the propeller from the engine.

Install a placard on the instrument panel adjacent to the RPM indicator reading as follows:

“AVOID CONTINUOUS OPERATION WHILE DESCENDING BETWEEN 2250 AND 2550 RPM WITH MANIFOLD PRESSURE SETTING BELOW 15 INCHES Hg”.

Note: McCauley Service Bulletin No. 76 also refers.

Compliance: Within 25 hours time in service after 29 January 1970.

Source text

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

1 AD/PA-24/24 - Propeller Inspection and Operating Instructions