AD 2005-04-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, -400D, and -400F Series Airplanes |
Unsafe Condition
Disengagement of all three flap control units (FCUs) at the same time, leading to loss of primary flaps control and flaps indication display.
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Required Actions
Replace at least one flap control unit (FCU) in the main equipment center with a new or modified FCU, in accordance with Boeing Alert Service Bulletin 747-27A2386, dated March 13, 2003. Concurrently, perform actions specified in Boeing Service Bulletin 747-27-2319, dated January 24, 1991.
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Compliance Time
Within 60 months after the effective date of the final rule (March 25, 2005).
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Affected Aircraft
Boeing Model 747-400, -400D, and -400F series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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