AD 2004-09-33
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 and 747-400D | Airworthiness Directives; Boeing Model 747-400 and 747-400D Series Airplanes |
Unsafe Condition
A chafed hole in the fire extinguishing system tube of the aft cargo compartment, which could result in a lack of fire extinguishing agent and consequent uncontained fire in the aft cargo compartment.
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Required Actions
Inspect the fire extinguishing system tube and clamp for correct installation. If not correctly installed, perform a repetitive pressure test of the fire extinguishing system tube for leakage. Take corrective action if necessary.
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Compliance Time
Before further flight.
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Affected Aircraft
Boeing 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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