AD 2023-23-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | S | Airworthiness Directives; Embraer S.A. (Type Certificate Previously Held by Yaborã Indústria Aeronáutica S.A.; Embraer S.A.) Airplanes |
Unsafe Condition
Unexpected wear on the wing hinge bearing assembly of the aileron surfaces, beyond the certification limits, was found during the functional test of the aileron control system backlash. Excessive backlash may result in a limit cycle oscillation phenomenon, exposing the surrounding structure and systems to unacceptable vibration levels and reducing airplane controllability.
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Required Actions
Repetitive inspections of the press-fitted bushings of the wing ailerons for migration and broken sealant, measurements of the distance between the aileron surfaces and hinge fittings, functional checks of the backlash of the wing aileron control system, and all applicable related investigative and corrective actions as specified in ANAC AD 2023-05-02.
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Compliance Time
Within the compliance times specified in ANAC AD 2023-05-02, as incorporated by reference.
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Affected Aircraft
Embraer S.A. Model ERJ 190-400 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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