AD 91-18-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D, and 810 Series Airplanes |
Unsafe Condition
Cracks in the wing flap guide rails and corrosion at the abutment face of flap guide rails and flap end ribs on landing flaps could reduce structural integrity of the landing flaps.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform non-destructive testing (NDT) inspections within 180 days after the effective date or prior to 500 landings after the effective date, whichever comes first, and thereafter every 360 days. Repairs for cracks or excessive corrosion must be approved by the FAA's Standardization Branch. Corrosion repairs require removal of guide rails, visual confirmation, rework, and reprotection as per specified PTLs, including dye penetrant inspection post-blending.
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Compliance Time
Within 180 days after the effective date of this AD, or prior to the accumulation of 500 landings after the effective date, whichever occurs first, and thereafter at intervals not to exceed 360 days
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Affected Aircraft
All Viscount Model 744, 745D, and 810 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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