AD 63-26-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Models PA-23 and PA-23-160 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-23-160 | Airworthiness Directives; Piper Models PA-23 and PA-23-160 Aircraft |
Unsafe Condition
Cracks in castings of elevator torque tube bracket, front stabilizer attachment, rudder torque tube horn, elevator torque tube horn, rudder torque tube bracket, and fin attachment bracket may occur due to fatigue, leading to tail area structural failure.
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Required Actions
Visually inspect castings for cracks within 50 hours in service after effective date, and repeat every 100 hours. For airplanes with 1,000+ hours, perform dye penetrant inspection within 100 hours and repeat every 500 hours. Replace cracked castings before flight with forged or cast parts per Piper SB 155B or FAA-approved method.
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Compliance Time
Within the next 50 hours in service after the effective date of this AD, unless already accomplished within the last 50 hours in service, and thereafter at intervals not to exceed 100 hours in service from the last inspection
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Affected Aircraft
Piper Models PA-23 and PA-23-160 Aircraft, Serial Numbers 23-1 through 23-1267, inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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