AD 67-25-07
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
The Graviner D.1870 or D.1870N/1 loop type overheat detectors and Graviner point type detectors (P/N 4D/3, 13D/3, 68D/3, 150D/07/180) may fail to provide adequate overheat detection, leading to potential fire hazards.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace Graviner D.1870 or D.1870N/1 loop type overheat detectors with Graviner D.5352N/1 coil overheat detectors. Replace existing point type detectors (P/N 4D/3, 13D/3, 68D/3, 150D/07/180) with specified replacements (P/N 134D/3, 135D/3, 136D/3, 150D/07/210). Perform replacements per BAC Modification Bulletins D.3187 Issue 2 (700 Series) or FG.2055 Issue 2 (810 Series), or equivalent approved method.
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Compliance Time
within the next 1,000 hours' time in service after the effective date of this AD
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Models 744, 745D, and 810 Series 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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