AD 92-08-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Mode 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Mode 747-400 Series Airplanes |
Unsafe Condition
Cross connection of cargo compartment and engine fire protection wiring and plumbing during maintenance could lead to unsafe conditions.
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Required Actions
Modify the cargo compartment fire extinguishing system plumbing and wiring per Boeing Service Bulletin 747-26-2143, Rev 1; modify the engine fire control module per SB 747-26-2164; modify the cargo smoke detection system wiring per SB 747-26-2168. Compliance with alternative methods may be approved by FAA's Seattle ACO.
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Compliance Time
Within the next 24 months after the effective date of this AD, unless accomplished previously.
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Affected Aircraft
Boeing Model 747-400 series airplanes up to and including line position 839.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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