AD 65-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; VICKERS Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; VICKERS Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; VICKERS Models 744, 745D, and 810 Series Airplanes |
Unsafe Condition
Failures of Pyrene fire extinguishers of Type DCD 2, DCD 2-1/4, DCD 10, or DCD 11 in Viscount Models 744, 745D, and 810 Series Airplanes.
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Required Actions
Overhaul, inspect, and test fire extinguishing systems with electric discharge facility per British Aircraft Corporation Technical Leaflets No. 256 (700 Series), No. 120 (800/810 Series). Blow through spray ring system with warm dry air during airplane overhaul to clear obstructions.
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Compliance Time
First airplane overhaul or within six months after October 3, 1965, whichever occurs first.
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Models 744, 745D, and 810 Series airplanes equipped with Pyrene fire extinguishers Type DCD 2, DCD 2-1/4, DCD 10, or DCD 11.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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