AD 71-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 810 Airplanes |
Unsafe Condition
Cracks in the rear pressure bulkhead boundary member due to fatigue could result in loss of cabin pressurization.
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Required Actions
Install an operating limitation placard prohibiting cabin pressure differential exceeding specified limits (3.5 or 4.5 p.s.i.) before further flight. Inspect the rear pressure bulkhead boundary member via x-ray radiography around the complete circumference. Repair cracks by reinforcing or replacing the boundary member section as specified.
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Compliance Time
Before further flight for placard installation; within next 50 or 100 landings after effective date for inspection (depending on landing count); repair cracks before further flight.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Model Viscount 810 airplanes.
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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