AD 2006-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-200 | Airworthiness Directives; Boeing Model 737-200, -300, and -400 Series Airplanes |
Unsafe Condition
Chafing of the direct-current-powered float switch wiring insulation in the center fuel tank, which could lead to contamination of the fueling float switch of the auxiliary fuel tank by moisture or fuel, and chafing of the float switch wiring against the float switch conduit in the fuel tank, presenting an ignition source inside the fuel tank that could cause a fire or explosion.
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Required Actions
Replace the existing fueling float switch in the auxiliary fuel tank with a new, improved fueling float switch. Install a new liner system inside the float switch conduit. Perform related investigative and other specified actions as outlined in the service bulletin.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 737-200, -300, and -400 series airplanes equipped with auxiliary fuel tanks.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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