AD 2012-15-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Water penetration into the main equipment center (MEC) could result in the loss of flight critical systems, as indicated by a report of an in-flight multi-power system loss of the 1, 2, and 3 alternating current electrical power systems.
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Required Actions
Install aluminum gutter reinforcing brackets to the forward and aft drip shield gutters of the MEC; add a reinforcing fiberglass overcoat to the top surface of the MEC drip shield; inspect for cracking and holes in the MEC drip shield, and perform corrective actions if necessary. Operators may also install an MEC drip shield drain system as an option, which would extend the compliance time for adding the reinforcing fiberglass overcoat.
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Compliance Time
Within 24 months for installing aluminum gutter reinforcing brackets; within 96 months for adding the reinforcing fiberglass overcoat to the top surface of the MEC drip shield.
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Affected Aircraft
The Boeing Company Model 747-400 and 747-400D series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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