AD 76-11-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 | Airworthiness Directives; Piper Model PA-23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23-250 Airplanes |
Unsafe Condition
Magnetic compass deviations exceeding 10 degrees when the landing/taxi lights and/or heater are turned on, creating hazards.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check magnetic compass function per Service Bulletin No. 493 or approved method. If deviation exceeds 10 degrees, perform wiring modification per the same service bulletin or approved method. Submit request with data through FAA Maintenance Inspector for extended compliance time or alternate methods.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Piper Model PA-23-250 (6 place) serial numbers 27-3837, 27-3944 to 27-7554092 inclusive; 27-7554094 to 27-7554159 inclusive; 27-7554161 to 27-7654018 inclusive; 27-7654020 to 27-7654024 inclusive; 27-7654026 to 27-7654036 inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Magnetic Compass Deviations
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-11-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-11-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23-250 Airplanes Subject: Magnetic Compass Deviations Status: Current Citation: This information is not available. Citation Publish Date: 06/01/1976 Effective Date: 06/04/1976 Make: Piper Aircraft Inc. Model: PA-23-250 | PA-23-250 (Navy UO-1) Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part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: 76-11-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2628 AD NUMBER: 76-11-07 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23-250 Airplanes ACTION: SUMMARY: DATES: Effective June 4, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-11-07 PIPER: Amendment 39-2628. Applies to Model PA-23-250 (6 place) S/Ns 27-3837, 27-3944 to 27-7554092 inclusive; 27-7554094 to 27-7554159 inclusive; 27-7554161 to 27-7654018 inclusive; 27-7654020 to 27-7654024 inclusive; 27-7654026 to 27-7654036 inclusive. Compliance required within the next 100 hours' time in service after the effective date of this AD unless already accomplished. To prevent the hazards associated with the excess magnetic compass deviations when the landing/taxi lights and/or heater are turned on, accomplish the following: (a) Check the magnetic compass function to ascertain operation of the magnetic compass within acceptable limits in accordance with the instructions given in Service Bulletin No. 493, dated March 25, 1976, or with an approved alternate method. (b) If compass deviation exceeds 10 degrees, a wiring modification is required in accordance with the referenced service bulletin or an approved alternate method. (c) 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 alternate methods of compliance. (Piper Service Bulletin No. 493, dated March 25, 1976, covers this subject). This amendment is effective June 4, 1976. FOOTER:
Document Text
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AD Final Rules - DRS_76-11-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-11-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23-250 Airplanes Subject: Magnetic Compass Deviations Status: Current Citation: This information is not available. Citation Publish Date: 06/01/1976 Effective Date: 06/04/1976 Make: Piper Aircraft Inc. Model: PA-23-250 | PA-23-250 (Navy UO-1) 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: 76-11-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2628 AD NUMBER: 76-11-07 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23-250 Airplanes ACTION: SUMMARY: DATES: Effective June 4, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-11-07 PIPER: Amendment 39-2628. Applies to Model PA-23-250 (6 place) S/Ns 27-3837, 27-3944 to 27-7554092 inclusive; 27-7554094 to 27-7554159 inclusive; 27-7554161 to 27-7654018 inclusive; 27-7654020 to 27-7654024 inclusive; 27-7654026 to 27-7654036 inclusive. Compliance required within the next 100 hours' time in service after the effective date of this AD unless already accomplished. To prevent the hazards associated with the excess magnetic compass deviations when the landing/taxi lights and/or heater are turned on, accomplish the following: (a) Check the magnetic compass function to ascertain operation of the magnetic compass within acceptable limits in accordance with the instructions given in Service Bulletin No. 493, dated March 25, 1976, or with an approved alternate method. (b) If compass deviation exceeds 10 degrees, a wiring modification is required in accordance with the referenced service bulletin or an approved alternate method. (c) 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 alternate methods of compliance. (Piper Service Bulletin No. 493, dated March 25, 1976, covers this subject). This amendment is effective June 4, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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