Flight Controls — Push Rod Assembly at Gust-lock/Power Lever Baulk Mechanism - Replacement
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace the affected push rod assembly with the modified part in accordance with the instructions of BAE Systems Service Bulletin 27-JM 5350. This replacement must be completed within two years from the effective date of 17 August 2021, unless already accomplished. Maintenance personnel should refer to the relevant Aircraft Maintenance Manuals and parts catalogues for guidance.
Summary
Civil Aviation Authority Airworthiness Directive G-2021-0005 addresses a safety issue affecting BAE Systems Jetstream 3100 and 3200 series aircraft, specifically those with constructor’s numbers up to 927 and from 929 to 936 inclusive. The directive mandates the replacement of the push rod assembly at the gust-lock/power lever baulk mechanism to prevent unintended power lever movement. This AD aims to enhance flight control safety by installing a modified push rod assembly.
What changed
This new Airworthiness Directive introduces a mandatory replacement of the affected push rod assembly, part number 137201E419, with a stronger serviceable part, number 137201E429, as detailed in BAE Systems Service Bulletin 27-JM 5350 Revision 01. It addresses a previously identified unsafe condition where a bent control rod allowed power levers to move beyond flight idle despite engaged gust locks, which could lead to loss of aircraft control.
Why it matters
This directive is critical for operators and maintenance organizations to prevent potential loss of aircraft control caused by a malfunctioning gust-lock system. Compliance ensures continued airworthiness and operational safety of affected Jetstream aircraft. It also helps maintenance teams focus on a known failure mode that could have serious safety consequences if left unaddressed.
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