AD 2011-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | Various | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 and ERJ 190 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 and ERJ 190 Airplanes |
Unsafe Condition
Screw units manufactured with metallographic non-conformity may increase susceptibility to brittle fracture, leading to loss of the related balance washer, causing a possible ram air turbine (RAT) imbalance event, which may result in RAT structural failure and loss of power to the airplane flight controls hydraulic back-up system.
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Required Actions
Within 1,200 flight hours or 6 months after the effective date, perform a general visual inspection (GVI) to determine the RAT model, part number, and serial number. Replace the RAT balance screw(s) with a new balance screw(s) and mark the RAT identification plate.
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Compliance Time
Within 1,200 flight hours or 6 months after the effective date, whichever occurs first.
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Affected Aircraft
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170-100 LR, -100 STD, -100 SE, -100 SU, ERJ 170-200 LR, -200 SU, -200 STD, ERJ 190-100 STD, -100 LR, -100 ECJ, -100 IGW, ERJ 190-200 STD, -200 LR, and -200 IGW airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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