AD 2001-08-24
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737 | Airworthiness Directives; Boeing Model 737 Series Airplanes |
Unsafe Condition
Extended dry operation of the center tank fuel pumps can result in overheating and excessive wear of the pump bearings, leading to metal-to-metal contact and the generation of sparks, which could ignite fuel vapors inside the center tank, potentially causing a fire or explosion.
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Required Actions
Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to prohibit extended dry operation of the center tank fuel pumps. Specifically, the AFM must state that center tank fuel pump switches must not be positioned to 'ON' unless the center tank fuel quantity exceeds 1,000 pounds (453 kilograms), except during defueling or fuel transfer. Additionally, the switches must be positioned to 'OFF' when both center tank fuel pump low pressure lights illuminate, and the pumps must not be 'ON' unless personnel are available in the flight deck to monitor low pressure lights.
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Compliance Time
Within 7 days after the effective date of this AD.
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Affected Aircraft
All Boeing Model 737 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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