AD 75-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 700 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 700 Series Airplanes |
Unsafe Condition
The horizontal stabilizer rear spar may experience in-flight fatigue failure due to cracks and corrosion.
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Required Actions
Inspect the rear spar of left and right horizontal stabilizer for cracks and corrosion, repair or replace as necessary per CAA-approved BAC Alert PTL No. 298, Issue 1 or FAA-approved equivalent. Accomplish BAC Modification Leaflet D.3268/D.3269 or FAA-approved equivalent. Ensure compliance with service life limitations post-modification.
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Compliance Time
Within the next 10 landings or 50 hours time in service, whichever occurs first (for spars with >25,000 landings on effective date) or before accumulation of 20,000 total landings or the lesser of 100 landings or 300 hours time in service after effective date, whichever occurs later (for other spars).
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount 744 and Viscount 745D models, all serial numbers, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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