AD 80-25-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31T | Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31T1 | Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes |
Unsafe Condition
Failure of the voltage regulator can result in complete electrical failure.
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Required Actions
Alter the voltage regulator (Piper P/N 584152) in accordance with Piper telegraphic letter #31-26 dated November 26, 1980, or an approved equivalent. Equivalent alterations must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, Jamaica, New York.
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Compliance Time
prior to further flight either at night or into instrument weather conditions
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Affected Aircraft
Piper Model PA-31T S/N 8120001 thru 8120010 and PA-31T1 airplanes S/N 8104001 thru 8104012
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Federal Register Abstract
Voltage Regulator Modification
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_80-25-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 80-25-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes Subject: Voltage Regulator Modification Status: Current Citation: This information is not available. Citation Publish Date: 02/12/1981 Effective Date: 02/12/1981 Make: Piper Aircraft Inc. Model: PA-31T | PA-31T1 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part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: 80-25-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4041 AD NUMBER: 80-25-05 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes ACTION: SUMMARY: DATES: Effective February 12, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 80-25-05 PIPER: Amendment 39-4041. Applies to Piper PA-31T S/N 8120001 thru 8120010 and Piper PA-31T1 airplanes S/N 8104001 thru 8104012. Compliance required as indicated: To prevent failure of the voltage regulator which can result in complete electrical failure, prior to further flight either at night or into instrument weather conditions, alter the voltage regulator, Piper P/N 584152 in accordance with Piper telegraphic letter #31-26, dated November 26, 1980, or an approved equivalent. Equivalent alterations must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, Jamaica, New York. This amendment is effective February 12, 1981, and was effective upon receipt for all recipients of the letter of November 26, 1980, covering this same subject. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_80-25-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 80-25-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes Subject: Voltage Regulator Modification Status: Current Citation: This information is not available. Citation Publish Date: 02/12/1981 Effective Date: 02/12/1981 Make: Piper Aircraft Inc. Model: PA-31T | PA-31T1 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: 80-25-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4041 AD NUMBER: 80-25-05 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-31T and PA-31T1 Airplanes ACTION: SUMMARY: DATES: Effective February 12, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 80-25-05 PIPER: Amendment 39-4041. Applies to Piper PA-31T S/N 8120001 thru 8120010 and Piper PA-31T1 airplanes S/N 8104001 thru 8104012. Compliance required as indicated: To prevent failure of the voltage regulator which can result in complete electrical failure, prior to further flight either at night or into instrument weather conditions, alter the voltage regulator, Piper P/N 584152 in accordance with Piper telegraphic letter #31-26, dated November 26, 1980, or an approved equivalent. Equivalent alterations must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, Jamaica, New York. This amendment is effective February 12, 1981, and was effective upon receipt for all recipients of the letter of November 26, 1980, covering this same subject. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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