AD 71-01-02
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
Failure of the flap gearbox drive motor assembly due to break-up of the steel inner clutch plate.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the flap gearbox drive motor clutch assembly with a solid spline adaptor using Rotax Modification No. 4603c Part A or equivalent. Replace obsolete clutch driving shafts, clutch shafts, and brake drum assemblies with specified replacement parts. Inspect brake drum assemblies for cracks every 5,000 landings and replace cracked components. Remove AD 68-23-07 placards and temporary procedures after completing replacements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 landings after January 21, 1971, or within the next 700 landings after the clutch plate was replaced under AD 68-23-07, whichever is later. Inspections must occur within 500 landings after January 21, 1971, and every 5,000 landings thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Models 744, 745D, and 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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