AD 2018-20-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
A Model 787 airplane that has been powered continuously for 248 days can lose all alternating current (AC) electrical power due to the generator control units (GCUs) simultaneously going into failsafe mode.
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Required Actions
Installing new software for the generator control unit (GCU) and removing certain airplanes from the applicability.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 787 airplanes, 55 airplanes of U.S. registry.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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