AD 71-19-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744 and 745D Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744 and 745D Airplanes |
Unsafe Condition
Cabin depressurization due to leakage through cracks in the rear pressure bulkhead boundary member.
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Required Actions
Install an operating limitation placard prohibiting cabin pressure differential exceeding specified limits before further flight. Inspect the rear pressure bulkhead boundary member for cracks using eddy current or visual inspection with magnifying lens. Repair cracks by reinforcing or replacing the boundary member section as required.
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Compliance Time
Compliance is required as indicated in paragraphs (a) to (c) based on accumulated landings: (a) 25,000+ landings must comply before further flight and within next 25 landings; (b) 20,000-24,999 landings must comply before further flight and within next 50 landings; (c) <20,000 landings must comply before 20,000 landings or 100 landings after effective date, whichever is later.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Models 744 and 745D 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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