AD 97-09-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | 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 create holes in the tubes, preventing proper distribution of fire extinguishing agent and delaying fire detection in the aft cargo compartment.
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Required Actions
Inspect tubes of the fire extinguishing and smoke detection systems and APU pneumatic duct support brackets per Boeing Alert Service Bulletin 757-26A0040. Corrective actions include replacing, repairing, or splicing damaged parts. Repeat inspections every 10,000 flight hours.
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Compliance Time
Prior to the accumulation of 10,000 flight hours, or within 60 days after the effective date of this AD, whichever occurs later. Repeat inspections every 10,000 flight hours.
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Affected Aircraft
Boeing Model 757-200 Series, 757-200CB Series, 757-200PF Series, and 757-300 Series airplanes, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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