ATR Main Landing Gear (MLG) Shock Absorbers — Cross Locking Bolt of the Attachment Pin
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance providers should ensure that MLG barrel replacements are performed only in approved repair shops using the latest revision of the applicable Messier-Dowty Component Maintenance Manuals. Repair shops must update local instruction cards accordingly and confirm the presence of the locking bolt as per Messier-Dowty Service Bulletin 631-32-190. No specific compliance deadline is stated.
Summary
EASA Safety Information Bulletin 2011-02 is an informational document addressing the ATR 42 and ATR 72 aeroplanes' main landing gear (MLG) shock absorbers, specifically the cross locking bolt of the attachment pin. It highlights the risk of migration and rupture of the shock absorber attachment pin due to missing locking bolts, referencing previous maintenance manuals and service bulletins.
What changed
This bulletin emphasizes the critical need to strictly follow the Messier-Dowty Component Maintenance Manual instructions and to ensure the locking bolt is installed during MLG maintenance. It reiterates the importance of using the latest revision of the applicable maintenance manuals and updating local instruction cards to prevent recurrence of the unsafe condition.
Why it matters
This information is vital for operators, maintenance organizations, and repair shops to prevent partial loosening or failure of the shock absorber at the upper attachment hinge, which could compromise landing gear integrity and aircraft safety. Ensuring proper installation of the locking bolt reduces the risk of in-service incidents related to MLG shock absorber attachment pin migration.
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