AD 75-26-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | BRITISH AIRCRAFT CORPORATION Model 700 and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | BRITISH AIRCRAFT CORPORATION Model 700 and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | BRITISH AIRCRAFT CORPORATION Model 700 and 810 Series Airplanes |
Unsafe Condition
Fatigue failure of the No. 1 and 2 landing flap torque shaft assemblies.
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Required Actions
Inspect torque tubes for cracks at specified intervals, replace torque tubes exceeding landing limits, and follow assembly instructions from Alert PTL No. 290 or 158. For No. 1 torque shafts with over 26,000 landings, replace after 2,000 additional landings or with inspections every 50/500 landings. For No. 2 torque shafts, inspect every 500 landings and reinspect every 2,000 landings post-initial replacement.
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Compliance Time
Before further flight if cracks are found; compliance required as indicated from the effective date January 14, 1976.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount 744, Viscount 745D, Viscount 810 models, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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