AD 77-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 Airplanes |
Unsafe Condition
Electrical terminals may short against the relay cover.
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Required Actions
Replace the spacer bushings in accordance with Service Bulletin No. 535 dated December 15, 1976, or an equivalent method approved by the FAA. Compliance time may be increased upon request with substantiating data through an FAA Maintenance Inspector.
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Compliance Time
within 100 hours in service
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Affected Aircraft
Piper Models PA-31, PA-31-325, and PA-31-350 with specified serial numbers: PA-31 includes S/N's 31-7612090, 31-7612091, 31-7612092, 31-7612096, 31-7612098, 31-7612101-31-7612105, 31-7612107-31-7612110, and 31-7712002-31-7712006; PA-31-350 includes S/N's 31-7652142-31-7652147, 31-7652149, 31-7652151, 31-7652152, 31-7652154-31-7652162, 31-7652164, 31-7652165, 31-7652167, 31-7652168, 31-7652171-31-7652174, 31-7652176, 31-7752002-31-7752007, 31-7752009-31-7752011, 31-7752013, 31-7752014, and 31-7752017-31-7752026.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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