AD 81-04-05 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Model PA-23, PA-23-235 and PA-23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-235 | Airworthiness Directives; Piper Model PA-23, PA-23-235 and PA-23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 | Airworthiness Directives; Piper Model PA-23, PA-23-235 and PA-23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23, PA-23-235 and PA-23-250 Airplanes |
Unsafe Condition
Malfunctioning of the flaps and flap control system due to cracks in the flap-spar hinge attachment areas and bellcrank.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and repair flap-spar hinge attachment areas for cracks per Piper Service Letter No. 853. Inspect flap control system for cracks per Piper Service Bulletin No. 671. Replace bellcrank with Piper P/N 16423-06 if cracks are found before further flight.
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Compliance Time
Within the next 100 or 50 hours in service based on hours in service, with subsequent inspections at intervals not exceeding 100 hours in service. For bellcrank replacement, before further flight.
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Affected Aircraft
Piper Model PA-23, PA-23-235, PA-23-250 (including Navy UO-1), serial numbers PA-23 S/N 23-1 thru 23-2046; PA-23-235 S/N 27-505 thru 27-622; PA-23-250 S/N 27-1 thru 27-504; PA-23-250 (6 place) S/N 27-2000 thru 27-8054059.
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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