AD 80-21-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D and 810 Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D and 810 Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AEROSPACE Viscount Model 744, 745D and 810 Airplanes |
Unsafe Condition
Failure of the elevator control system due to cracks or excessive time in service on spigot fitting P/N 70120-367 and potential defects in the spring servo tab operating mechanism and tailplane top root end fittings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace spigot fitting P/N 70120-367 based on time in service: before further flight if over 12,000 hours or unknown, inspect and replace if cracked, or within specified intervals. Inspect spring servo tab operating mechanism and tailplane fittings for defects, repair as needed. Ensure twin center bearing assembly is free to move during spigot fitting replacement. Report defects to specified FAA office.
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Compliance Time
Before further flight, within 300 hours time in service after the effective date, prior to September 15, 1981, or based on accumulated time thresholds as specified.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Model 744, 745D, and 810 airplanes certificated in all categories.
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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