AD 93-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes |
Unsafe Condition
Failure of the wing main tank float switch electrical conduits and subsequent fuel leakage resulting in an engine tail pipe fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect wing main tank float switch electrical conduits for fuel leakage and condensation build-up at intervals not to exceed 1,500 flight hours. If leakage or condensation is found, purge and install a new vapor seal assembly before further flight. Within 3 years after the effective date, install grease in the conduits to terminate inspection requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 90 days after the effective date of the referenced ADs and thereafter at intervals not to exceed 1,500 flight hours. For grease installation, within 3 years after November 24, 1993.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 737-300, -400, and -500 series airplanes through line position 2428; Model 737-200 series equipped with DC powered fuel tank float switches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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