AD 66-18-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23-250 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-E23-250 | Airworthiness Directives; Piper Model PA-23-250 and PA-E23-250 Airplanes |
Unsafe Condition
Engine power failures due to induction system icing.
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Required Actions
Attach an operating limitation placard to the instrument panel within 10 hours' time in service after the effective date. Modify the alternate air systems to provide heated alternate air within 100 hours' time in service after the effective date, in accordance with Piper Service Bulletin No. 230A and Kit No. 757021.
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Compliance Time
Within the next 10 hours' time in service after the effective date of this AD, until modified in accordance with (b), and within the next 100 hours' time in service after the effective date for modification.
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Affected Aircraft
Piper Model PA-23-250 (Navy UO-1) and PA-E23-250 Airplanes, Serial Numbers 27-2505 through 27-3139 and 27-3141 through 27-3275, not equipped with turbochargers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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