AD 91-16-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
Unsafe Condition
Fuel leaking from the auxiliary fuel tank in the aft cargo bay could lead to a fire.
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Required Actions
Deactivate the auxiliary fuel system and placard its inoperability, or install check and pressure-activated shutoff valves. Inspect fuel tank panels for disbonding or cracks every 500 flight cycles, and conduct structural inspections every 12,000 flight cycles. Repair or deactivate if defects are found. Auxiliary tanks not installed must be inspected if over 4,000 flight cycles.
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Compliance Time
Within 90 days after the effective date (September 6, 1991).
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Affected Aircraft
Boeing Model 737 series airplanes equipped with a Boeing aft cargo bay auxiliary fuel tank, listed in Boeing Service Bulletin 737-28-1088 dated September 6, 1990.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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