AD 71-08-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
Unsafe Condition
Hazardous drift in the bus-bar undervoltage sensing unit setting
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace transistor T.1 in the Rotax Voltage Sensing Unit Type U.3619 with a new transistor in accordance with Rotax Service Bulletin No. 24-368 dated 4 May 1970, or later ARB-approved issue or FAA approved equivalent. Incorporate Rotax Modification SP7174.
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Compliance Time
within the next 1000 hours' time in service after the effective date of this AD or upon installation of the bus-bar undervoltage warning light in accordance with AD 70-02-04, whichever occurs later
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount 744, Viscount 745D, and Viscount 810 series airplanes
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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