Commonwealth legislation

AD/MU-2/40 - Placard - Use of Reverse Thrust

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

Requires operators of MU-2 models fitted with Garrett TPE‑331 engines and Hartzell HC‑B4(T,M)N‑5( ) propellers to install a temporary cockpit placard stating “Until propellers are modified to Hartzell SB 153, avoid the use of full reverse pitch.” Owners/operators or their maintenance agents must fit the placard by 30 October 1987. The action responds to pitch‑change rod failures during ground full‑reverse that can cause severe asymmetric thrust or engine overtemperature; the placard is a short‑term mitigation until the SB 153 modification.

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AD/MU-2/40 - Placard - Use of Reverse Thrust

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Mitsubishi MU-2 Series Aeroplanes

AD/MU-2/40 Placard - Use of Reverse Thrust 10/87 DM

Applicability: All model MU-2-( ) fitted with Garrett TPE-331 turboprop engines to which Hartzell model HC-B4(T,M)N-5( ) propellers are fitted.

Requirement: Install a temporary placard in a suitable position in the cockpit worded as follows: “Until propellers are modified to Hartzell SB 153, avoid the use of full reverse pitch.”

Compliance: By 30 October 1987.

Background: During the past several months the four bladed steel hub propeller fitted to MU-2-( ) series a/c has experienced failure of the pitch change rod P/N B-3018S-2. Failure 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 overtemperature conditions.

Source text

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

1 AD/MU-2/40 - Placard - Use of Reverse Thrust