AD 77-08-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31-300 | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31P | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31T | Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft |
Unsafe Condition
Electrical short between the Pilot/Copilot Microphone and Phone Jack Relay and mounting bracket
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Key both pilot and copilot microphones simultaneously to test transmission. If relay is not installed, no further action required. If installed, comply with Piper Service Bulletin No. 526A or approved equivalent method.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours in service after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T with specific serial ranges: PA-31/31-300/31-325 S/Nos. 31-752 thru 31-7712010; PA-31-350 S/Nos. 31-5001 thru 31-7752028; PA-31P S/Nos. 31P-67 thru 31P-7730001; PA-31T S/Nos. 31T-7400002 thru 31T-7720008
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.