AD 57-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; VICKERS Model 700 Series Aircraft |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; VICKERS Model 700 Series Aircraft |
Unsafe Condition
Cracks in the trunnion pins and bearing bolts of the main landing gear retraction jack assembly could lead to failure of the landing gear retraction system.
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Required Actions
Replace trunnion fork end P/N 74450-99 and pin P/N 7450-101 at 2,500 flights; replace bearing bolt P/N 74450-103 at 5,000 flights; replace trunnion block P/N 74450-79, pin P/N 74450-81, and bearing bolt P/N 74450-341 or 74450-83 at 7,000 flights. Conduct precautionary visual inspections for cracks on the trunnion at next daily inspection if exceeding 2,500 flights, with replacement required if cracks are found before further flight.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount 700 Series Aircraft equipped with 14-inch stroke oleos.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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