Airworthiness DirectiveEASA AD 2019-0078

Flight Controls — Trimmable Horizontal Stabilizer Actuator Ball Nut Trunnion Lower Attachment — Inspection of Right-Hand Bearing Installation

Published: Mar 29, 2019
Effective: Apr 12, 2019
Deadline: Oct 9, 2020

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

What to do

Operators of affected Airbus A300, A300-600, A300-600ST, and A310 aircraft must perform a one-time detailed inspection of the right-hand bearing and related parts within 750 flight hours or 18 months from the effective date of 12 April 2019, whichever occurs first. If the bearing is missing, corrective action must be taken before the next flight by contacting Airbus for instructions. If deficiencies are found, applicable repairs must be completed before further flight following Airbus Service Bulletin instructions.

Summary

EASA Airworthiness Directive 2019-0078 is an airworthiness directive addressing the inspection of the right-hand bearing installation on the trimmable horizontal stabilizer actuator ball nut trunnion lower attachment for Airbus A300, A300-600, A300-600ST, and A310 aeroplanes. It mandates a one-time detailed inspection of the affected parts to ensure proper installation and prevent potential actuator failure. The directive applies to all certified models and serial numbers of these Airbus aircraft.

What changed

This new airworthiness directive introduces a mandatory one-time detailed inspection of the trimmable horizontal stabilizer actuator's right-hand spherical bearing and retaining parts to detect any missing or deficient components. It requires corrective actions if issues are found, including contacting Airbus for approved instructions if the bearing is missing. The directive does not supersede any previous ADs.

Why it matters

This directive is critical for aviation professionals because missing or defective parts in the trimmable horizontal stabilizer actuator could lead to actuator failure and potential loss of aircraft control. Operators and maintenance organizations must ensure compliance to maintain aircraft safety and airworthiness. Timely inspections and corrective actions help prevent unsafe flight conditions and regulatory non-compliance.

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