AD 71-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes |
Unsafe Condition
Hazardous drift in the Rotex voltage sensing unit due to transistor T.1 in the Rotax Voltage Sensing Unit Type U.3624 or U.3624/1.
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Required Actions
Replace transistor T.1 in the Rotax Voltage Sensing Unit with a new transistor per Hawker Siddeley Aviation, Ltd. Service Bulletin 24/124 (7355) dated July 9, 1970, or later ARB/FAA-approved equivalent. Incorporate Rotax Modification No. SP.7172.
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Compliance Time
within the next 200 hours' time in service after the effective date of this AD
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Affected Aircraft
HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series 1A serial numbers 25013, 25104, 25016, 25018, 25021, 25022, 25026, 25027, 25030, 25031, 25034 through 25039, 25042, 25051 through 25053, 25057, and 25058; and series 1A-522 serial numbers 25017, 25020, 25023, 25029, 25032, 25033, 25043, 25046, 25047, 25060, 25064, 25065, 25066, 25068, 25070, 25073 through 25075, 25078, 25079, 25082 through 25084, 25086 through 25088, 25091, 25093, and 25095 airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rotex Voltage Sensing Unit
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_71-16-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-16-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes Subject: Rotex Voltage Sensing Unit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1971 Make: Textron Aviation Inc. Model: DH.125 Series 1A | DH.125 Series 1A-522 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 71-16-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1329 AD NUMBER: 71-16-02 SUBJECT HEADING: Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes ACTION: SUMMARY: DATES: Effective November 5, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-16-02 HAWKER-SIDDELEY AVIATION, LTD.: Amdt. 39-1251 as amended by Amendment 39-1329. Applies to Hawker-Siddeley Model DH-125 series 1A serial numbers 25013, 25104, 25016, 25018, 25021, 25022, 25026, 25027, 25030, 25031, 25034 through 25039, 25042, 25051 through 25053, 25057, and 25058; and series 1A-522 serial numbers 25017, 25020, 25023, 25029, 25032, 25033, 25043, 25046, 25047, 25060, 25064, 25065, 25066, 25068, 25070, 25073 through 25075, 25078, 25079, 25082 through 25084, 25086 through 25088, 25091, 25093, and 25095 airplanes. To prevent a hazardous drift in the Rotax voltage sensing unit, within the next 200 hours' time in service after the effective date of this AD, unless already accomplished, incorporate Rotax Modification No. SP.7172 by replacing the transistor T.1 in the Rotax Voltage Sensing Unit Type U.3624 or U.3624/1 with a new transistor in accordance with Hawker Siddeley Aviation, Ltd., 125 Series Aircraft Service Bulletin 24/124 (7355), dated July 9, 1970, or later ARB-approved issue or FAA-approved equivalent. Amendment 39-1251 became effective August 23, 1971. This Amendment 39-1329 becomes effective November 5, 1971. FOOTER:
Document Text
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AD Final Rules - DRS_71-16-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-16-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes Subject: Rotex Voltage Sensing Unit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1971 Make: Textron Aviation Inc. Model: DH.125 Series 1A | DH.125 Series 1A-522 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 71-16-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1329 AD NUMBER: 71-16-02 SUBJECT HEADING: Airworthiness Directives; HAWKER-SIDDELEY AVIATION, LTD. Model DH-125 Series Airplanes ACTION: SUMMARY: DATES: Effective November 5, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-16-02 HAWKER-SIDDELEY AVIATION, LTD.: Amdt. 39-1251 as amended by Amendment 39-1329. Applies to Hawker-Siddeley Model DH-125 series 1A serial numbers 25013, 25104, 25016, 25018, 25021, 25022, 25026, 25027, 25030, 25031, 25034 through 25039, 25042, 25051 through 25053, 25057, and 25058; and series 1A-522 serial numbers 25017, 25020, 25023, 25029, 25032, 25033, 25043, 25046, 25047, 25060, 25064, 25065, 25066, 25068, 25070, 25073 through 25075, 25078, 25079, 25082 through 25084, 25086 through 25088, 25091, 25093, and 25095 airplanes. To prevent a hazardous drift in the Rotax voltage sensing unit, within the next 200 hours' time in service after the effective date of this AD, unless already accomplished, incorporate Rotax Modification No. SP.7172 by replacing the transistor T.1 in the Rotax Voltage Sensing Unit Type U.3624 or U.3624/1 with a new transistor in accordance with Hawker Siddeley Aviation, Ltd., 125 Series Aircraft Service Bulletin 24/124 (7355), dated July 9, 1970, or later ARB-approved issue or FAA-approved equivalent. Amendment 39-1251 became effective August 23, 1971. This Amendment 39-1329 becomes effective November 5, 1971. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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