AD 74-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23-250 Airplanes |
Unsafe Condition
Cracks developing in the outboard flap hinges (part numbers 17103-04 and 17103-05) could cause asymmetric flap conditions.
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Required Actions
Inspect outboard flap hinges (part numbers 17103-04 and 17103-05) using a 10-power magnifying glass or equivalent method approved by the FAA. Clean hinges before inspection. Replace cracked hinges with unused parts of the same part numbers or FAA-approved equivalents before further flight. Compliance is not required if Piper Kits 760 861 (right) and 760 817 (left) are installed.
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Compliance Time
Within the next 25 hours in service after December 31, 1975, and every 100 hours thereafter. Compliance time may be increased upon FAA approval with substantiating data.
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Affected Aircraft
Piper Model PA-23-250 (Navy UO-1) airplanes with serial numbers 27-3050, 27-3154 to 27-7405330.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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