AD 78-26-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; Piper Model PA-31-350 Aircraft |
Unsafe Condition
The elevator control system may have restricted operation due to the lightening hole in the frame at Fuselage Station 87.50 interfering with the cable guide tube, and potential wear on the hydraulic line and elevator control cable tension issues.
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Required Actions
Install Piper Part Number 71045-2 cable guide tube around the lightening hole at Fuselage Station 87.50, install nylon spiral sleeving around the hydraulic line, and adjust elevator control cable tension per Piper Service Bulletin 621 and the PA-31-350 Service Manual. Compliance may be done via an equivalent method approved by the FAA.
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Compliance Time
within the next 25 hours of operation after the effective date of this AD
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Affected Aircraft
Piper Model PA-31-350 Navajo Chieftain aircraft, Serial Numbers 31-5001 through 31-7852151
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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