Flight Controls - Aileron Control System Backlash - Inspection
- Published
- Effective
- Replaces
- 2023-06-01R1
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform initial and recurring inspections of the left and right wing aileron bearings and bushings within specified flight hour intervals, as detailed in the AD. If any irregularities such as migrated bushings, broken sealant, or excessive backlash are found, immediate replacement and corrective actions are required before further flight. Compliance deadlines vary based on aircraft flight hours and previous maintenance history, with the latest effective date being December 30, 2024.
Summary
Brazilian Airworthiness Directive AD No. 2023-06-01R2 addresses the inspection and potential replacement of bearings and bushings in the aileron control system backlash on Embraer ERJ 190-300 aircraft. This directive mandates inspections following Embraer Service Bulletin 190E2-27-0027, revision 03, to ensure the aileron control system operates within certification limits and prevents excessive vibration. The AD applies to all Embraer ERJ 190-300 airplanes registered in Brazil.
What changed
This AD supersedes the previous AD No. 2023-06-01R1 and introduces a terminating action to the inspection requirements. It updates compliance intervals and inspection procedures to include detailed checks of wing hinge bearings and bushings, as well as functional and operational checks of the aileron control system backlash. The revision also clarifies replacement criteria and inspection definitions.
Why it matters
Excessive backlash in the aileron control system can lead to Limit Cycle Oscillation, causing unacceptable vibration and reduced controllability, which poses a significant safety risk. Operators and maintenance organizations must comply to ensure continued airworthiness and avoid potential structural damage or control issues. This directive helps maintain flight safety and regulatory compliance for Embraer ERJ 190-300 operators.
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