Airworthiness DirectiveEASA AD BR-2021-02-02

[Correction] Main Landing Gear Side Arm Strut Lower Bearing - Inspection / Replacement

Published: Mar 2, 2021
Effective: Feb 26, 2021

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What to do

Operators must perform a one-time visual inspection of the right and left MLGs within 30 days or 150 flight hours from the AD's effective date, whichever occurs first. If incorrect installation or damage is found, affected parts must be reinstalled or replaced before the next flight. Only serviceable MLG Lower Side Arms with grease fittings on the same side may be installed after the AD's effective date. Any discrepancies must be reported to ANAC and Embraer within 120 hours of discovery.

Summary

The Brazilian Airworthiness Directive AD No. 2021-02-02 issued by ANAC mandates inspection and corrective actions for the Main Landing Gear (MLG) Side Arm Strut Lower Bearing on Yaborã Indústria Aeronáutica S.A. aircraft models EMB-145 and EMB-135 series. This directive addresses issues related to inverted installation and migration of the MLG Side Arm Strut Bearings, which could compromise landing gear locking during critical flight phases. The AD applies to all serial numbers of the specified aircraft models.

What changed

This new directive introduces mandatory one-time inspections of the MLG Lower Side Arm grease fittings and Side Arm Strut Bearings for correct installation and condition. It requires replacement or reinstallation of parts if discrepancies such as inverted bearings, bearing migration, or incorrect grease fitting positions are found. Additionally, it prohibits installation of non-serviceable MLG Lower Side Arms after the AD's effective date.

Why it matters

Compliance with this AD is critical to prevent potential disconnection of the MLG Side Arm Strut, which could lead to failure of the landing gear to lock in the down position and result in loss of control during takeoff or landing. Operators and maintenance organizations must ensure proper assembly and condition of these components to maintain aircraft safety and airworthiness. The directive also provides procedures and contact points for reporting findings and obtaining special flight permits if necessary.

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