AD 72-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-235 | Airworthiness Directives; Piper Models PA-23-235, PA-23-250, and PA-E23-250 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Models PA-23-235, PA-23-250, and PA-E23-250 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-E23-250 | Airworthiness Directives; Piper Models PA-23-235, PA-23-250, and PA-E23-250 Series Airplanes |
Unsafe Condition
Possible explosion and fire resulting from fuel vapor ignition during engine starting.
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Required Actions
Visually check wings' lower surfaces for fuel stains and fuel odor prior to first flight daily. Inspect every 50 hours for serial numbers 27-2505 through 27-4765. Record compliance in maintenance log. Repairs must be done per Piper Service Manual or approved method if leaks found.
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Compliance Time
Prior to first flight of each day for serial numbers 27-1 through 27-2504. Within 50 hours' time in service after AD effective date or last inspection, and every 50 hours thereafter for serial numbers 27-2505 through 27-4765.
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Affected Aircraft
Piper Models PA-23-235, PA-23-250 (Navy UO-1), PA-E23-250, serial numbers 27-1 through 27-4765 inclusive, equipped with non-supercharged engines, including STC SA179CE and SA867SW modified airplanes.
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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