Safety Information BulletinEASA SIB 2008-56

Main Rotor Blade De-Icing System Distributor Retaining Clamps - Check / Replacement

Published: Jun 19, 2008
Deadline: Sep 19, 2008

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must inspect the retaining clamps and screws within 50 flight hours or 3 months from June 19, 2008, whichever comes first. Inspections include checking clamp condition, screw head interference, screw shank cracks, and presence of lock-wiring holes. If defects are found, clamps must be reworked, screws replaced, or lock-wiring holes drilled accordingly. Spare clamp/screw assemblies must also be inspected and corrected before installation within 3 months.

Summary

EASA Safety Information Bulletin 2008-56 is an informational bulletin concerning Eurocopter AS 332 C, C1, L, L1 and SA 330 F, G, J helicopters equipped with main rotor blade de-icing system distributor retaining clamps, part numbers 225000-18454 or D18454 without batch number or letter "V" marking. It addresses a safety issue identified by the French DGAC Emergency Airworthiness Directive UF-2008-008 regarding potential failure of the retaining clamp screws. The bulletin provides guidance on inspection and corrective actions but does not impose mandatory requirements under EASA regulations.

What changed

This bulletin introduces a safety information notice following the discovery of two failures of the retaining clamp screws due to assembly stress and missing lock-wiring holes. It outlines the need to inspect the clamps and screws for cracks, interference, and proper lock-wiring provisions, and mandates corrective actions such as reworking clamps, replacing screws, or drilling lock-wiring holes. The bulletin clarifies that EASA does not have authority to mandate this AD as it is related to manufacturing non-conformity, not design approval.

Why it matters

This safety information is critical for operators and maintenance organizations of affected Eurocopter helicopters to prevent potential main or tail rotor blade damage and risks to personnel on the ground. It highlights a manufacturing defect that could compromise flight safety if not addressed promptly. Compliance ensures continued airworthiness and reduces the risk of in-flight failures related to the de-icing system distributor retaining clamps.

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