AD 2000-12-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Equipped with Pratt & Whitney PW4000 Series Engines |
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Equipped with Pratt & Whitney PW4000 Series Engines |
Unsafe Condition
In-flight deployment of a thrust reverser could result in a significant reduction in airplane controllability.
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Required Actions
Install a modification of the thrust reverser control and indication system and wiring on each engine. Perform repetitive functional tests of the installation to detect and repair discrepancies, if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-400 series airplanes equipped with Pratt & Whitney PW4000 series engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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