AD 78-12-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-30 | Airworthiness Directives; Piper Models PA-30 and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-39 | Airworthiness Directives; Piper Models PA-30 and PA-39 Airplanes |
Unsafe Condition
The right fuel selector valve with Piper P/N 492137 (Airborne P/N 1H7-8) containing the designation '4C' in the valve serial number may fail, leading to fuel system malfunction.
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Required Actions
Replace the right fuel selector valve containing '4C' in the serial number with a serviceable valve without the '4C' designation. Install and adjust the replacement valve per PA-30/39 Service Manual.
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Compliance Time
before further flight
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Affected Aircraft
Piper Models PA-30 (Serial Numbers 30-1 through 30-2000) and PA-39 (Serial Numbers 39-1 through 39-155) with a right fuel selector valve P/N 492137 (Airborne P/N 1H7-8) changed since April 1977 with a valve containing '4C' in the serial number.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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