Commonwealth legislation

AD/PHZL/56 - Pitch Change Rod

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

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This airworthiness directive orders operators of Hartzell HC-B4(T,M)N-5 propellers fitted with pitch change rods P/N B-3018S-2 or B-3018T-2 (used on Garrett TPE‑331 installations) to carry out the work set out in Hartzell Service Bulletin No.153 at their next overhaul between 30 Sep 1987 and 30 Sep 1988. It responds to reported failures of the pitch change rod under full reverse, which can drive the propeller deeper into reverse and create asymmetric thrust or engine over‑temperature risks.

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AD/PHZL/56 - Pitch Change Rod

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Propellers - Variable Pitch - Hartzell

AD/PHZL/56 Pitch Change Rod 10/87

Applicability: All Hartzell propeller models HC-B4(T,M)N-5( ) fitted with either B-3018S-2 or B- 3018T-2 pitch change rods.

Note: HC-B4(T,M)N-5 propellers are installed on Garrett TPE-331 turboprop engines. The affected propellers are installed on but not limited to : Dornier DO-228 ( ), Mitsubishi MU-2-( ), Swearingen SA-226, CASA C-212-( ), Beech B100 and Shorts SC-7.

Requirement: Action in accordance with Hartzell Service Bulletin No. 153.

Compliance: At next overhaul after 30 September 1987 or before 30 September 1988 whichever occur first.

Background: The four bladed steel hub propeller type used on Garrett powered installations has experienced failure of the pitch change rod P/N B-3018S-2. Failure of this rod has occurred during ground operation with application of full reverse pitch. Rod failure in this position will cause the propeller to travel deeper into reverse which could cause severe asymmetric thrust conditions or unacceptable engine over temperature conditions.

Source text

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

1 AD/PHZL/56 - Pitch Change Rod