AD 88-21-07 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-160 | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-235 | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-E23-250 | Airworthiness Directives; Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 Airplanes |
Unsafe Condition
Precipitation and/or wash water entering the fuel filler compartment and leaking into the fuel cell resulting in engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect fuel vent/drain lines, thermos type fuel cell caps, and fuel filler compartment covers in accordance with Piper SB No. 340. Correct any defects before further flight. Compliance may be done within 60 calendar days after effective date and every 12 calendar months thereafter.
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Compliance Time
Within the next 60 calendar days after the effective date of this AD and at intervals not to exceed 12 calendar months thereafter, unless already accomplished per the unrevised version of this AD.
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Affected Aircraft
Piper Model PA-23, PA-23-160, PA-23-250, PA-23-235, and PA-E23-250 (all serial numbers) except Model PA-23-250 serial numbers 27-7654001 through 27-8154030.
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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