AD 2014-05-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
| engine | Rolls-Royce | RB211-524 | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Multiple reports of uncommanded thrust reverser unlock events, which could lead to uncommanded thrust reverser deployment during takeoff or in flight, resulting in decreased airplane control and performance, possible runway excursions, and failure to climb.
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Required Actions
Replace certain relays and relay sockets, and perform wiring changes. For certain airplanes, install new relay panels and remove/install certain components. Additionally, for certain airplanes, install an additional locking system on the thrust reversers and modify system wiring for in-flight fault indications of the thrust reverser system.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-200B, 747-200F, 747-300, 747SP, 747-400, 747-400F series airplanes equipped with Rolls-Royce RB211-524 engines; and certain Model 767-300 series airplanes equipped with Rolls-Royce RB211-524 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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