Commonwealth legislation

AD/PHZL/50 - A-4025 Spring Retainer - Inspection

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This Act has been repealed and is no longer in force. It is retained for historical reference.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: This is a safety rule requiring a one-time inspection of a specific aircraft part—the A-4025 spring retainer—on certain Hartzell five-bladed propellers (model HC-B5MP-3 series).

Who it affects: Aircraft operators, owners, and maintenance organisations responsible for these specific propeller models.

What you must do: Have the spring retainer inspected the next time the propeller is taken apart for reconditioning (overhaul) or repair—whichever happens first. The inspection looks for manufacturing defects (called "inclusions," which are impurities or gaps inside the metal) that could cause the retainer to break.

Why it matters: The manufacturer discovered that some retainers were made with internal defects that could lead to failure during operation. This rule ensures potentially dangerous parts are identified and replaced before they cause propeller failure.

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Current sections

Direct links to the current provisions in AD/PHZL/50 - A-4025 Spring Retainer - Inspection.

AD/PHZL/50 - A-4025 Spring Retainer - Inspection

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Propellers - Variable Pitch - Hartzell

AD/PHZL/50 A-4025 Spring Retainer - Inspection 2/84

Applicability: Five bladed turbine propellers model HC-B5MP-3 Series, as listed in Service Letter No. 149.

Document: Hartzell Service Letter No. 149.

Compliance: At next reconditioning or rectification necessitating disassembly, whichever is the sooner.

Background: The manufacturer advises that a significant number of retainers have been discovered possessing an inclusion consequently a one off inspection is required to preclude the possibility of retainer failure.

Source text

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