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.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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