AD Amdt-39-10002
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 757 | Airworthiness Directives; Boeing Model 757 Series Airplanes |
Unsafe Condition
Chafing of the tubes of the fire extinguishing and smoke detection systems against the stiffener rings and support brackets of the APU pneumatic duct could result in holes in the tubes, leading to improper distribution of fire extinguishing agent and delayed fire detection in the aft cargo compartment.
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Required Actions
Conduct repetitive inspections to detect damage to the fire extinguishing and smoke detection system tubes and APU duct support brackets. Perform corrective actions as necessary to address detected chafing or damage.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 757 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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