AD 2011-18-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 737-600 | Airworthiness Directives; The Boeing Company Model 737-600, -700, -700C, -800, and -900 Series Airplanes |
Unsafe Condition
Center tank fuel pump operation with continuous low pressure, which could lead to friction sparks or overheating in the fuel pump inlet that could create a potential ignition source inside the center fuel tank. These conditions, in combination with flammable fuel vapors, could result in a center fuel tank explosion and consequent loss of the airplane.
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Required Actions
Install an automatic shutoff system for the center tank fuel boost pumps. Install a placard in the airplane flight deck if necessary. Revise the Limitations and Normal Procedures sections of the airplane flight manual to advise the flightcrew of certain operating restrictions. Install a secondary control relay for the electrical control circuit of each of the two center tank fuel boost pumps. Revise the maintenance program to incorporate Airworthiness Limitation (AWL) No. 28-AWL-23. Optionally, install and maintain universal fault interrupters using a certain supplemental type certificate.
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Compliance Time
Within 12 months of the effective date (September 30, 2011)
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Affected Aircraft
The Boeing Company Model 737-600, -700, -700C, -800, and -900 Series Airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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