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.
Federal Register Abstract
Electrical Short
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-08-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-08-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft Subject: Electrical Short Status: Current Citation: This information is not available. Citation Publish Date: 04/18/1977 Effective Date: 11/15/1977 Make: Piper Aircraft Inc. Model: PA-31 | PA-31-300 | PA-31-325 | PA-31-350 | PA-31P | PA-31T Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-08-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3074 AD NUMBER: 77-08-02 SUBJECT HEADING: Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft ACTION: SUMMARY: DATES: Effective November 15, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-08-02 PIPER: Amendment 39-2874 as amended by Amendment 39-3074. Applies to PA-31, PA-31-300 and PA-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. Compliance required within the next 50 hours in service after the effective date of this AD unless already accomplished. To avoid an electrical short between the Pilot/Copilot Microphone and Phone Jack Relay and mounting bracket, comply as follows: (a) Key both the pilot and copilot microphone at the same time. If you can transmit through the pilot's microphone, the subject relay is not installed in the aircraft and no further action is required. (b) If the relay is installed, comply with the "Instructions" paragraph of Piper Service Bulletin No. 526A, dated July 25, 1977, or with an approved equivalent method. Upon request with substantiating data submitted through an FAA Maintenance Inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, who must also approve equivalent methods of compliance. Amendment 39-2874 become effective April 20, 1977. This amendment 39-3074 is effective November 15, 1977. FOOTER:
Document Text
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AD Final Rules - DRS_77-08-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-08-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft Subject: Electrical Short Status: Current Citation: This information is not available. Citation Publish Date: 04/18/1977 Effective Date: 11/15/1977 Make: Piper Aircraft Inc. Model: PA-31 | PA-31-300 | PA-31-325 | PA-31-350 | PA-31P | PA-31T Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-08-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3074 AD NUMBER: 77-08-02 SUBJECT HEADING: Airworthiness Directives; Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, and PA-31T Aircraft ACTION: SUMMARY: DATES: Effective November 15, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-08-02 PIPER: Amendment 39-2874 as amended by Amendment 39-3074. Applies to PA-31, PA-31-300 and PA-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. Compliance required within the next 50 hours in service after the effective date of this AD unless already accomplished. To avoid an electrical short between the Pilot/Copilot Microphone and Phone Jack Relay and mounting bracket, comply as follows: (a) Key both the pilot and copilot microphone at the same time. If you can transmit through the pilot's microphone, the subject relay is not installed in the aircraft and no further action is required. (b) If the relay is installed, comply with the "Instructions" paragraph of Piper Service Bulletin No. 526A, dated July 25, 1977, or with an approved equivalent method. Upon request with substantiating data submitted through an FAA Maintenance Inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, who must also approve equivalent methods of compliance. Amendment 39-2874 become effective April 20, 1977. This amendment 39-3074 is effective November 15, 1977. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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