AD 2011-16-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 747-400 and -400F | Airworthiness Directives; The Boeing Company Model 747-400 and -400F Series Airplanes |
Unsafe Condition
Loss of bus control unit number 1 and generator control units numbers 1 and 2 while the airplane was on the ground, and multiple operator reports of cracked main equipment center (MEC) drip shields, which could result in water penetration into the MEC and loss of flight critical systems.
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Required Actions
Inspect the MEC drip shields for cracks and holes, repair as necessary, install a fiberglass reinforcing overcoat, and for certain airplanes, install stiffening panels to the MEC drip shields.
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Compliance Time
Within 24 months of the effective date (September 9, 2011).
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Affected Aircraft
The Boeing Company Model 747-400 and -400F Series Airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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