AD 53-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Limited | Gipsy Queen 70-4 | De HAVILLAND GYPSY QUEEN Model 70-4, 70, 70-2, and 70-3 Engines |
| engine | Rolls-Royce Limited | Gipsy Queen 70 MK2 | De HAVILLAND GYPSY QUEEN Model 70-4, 70, 70-2, and 70-3 Engines |
| engine | Rolls-Royce Limited | Gipsy Queen 70 MK3 | De HAVILLAND GYPSY QUEEN Model 70-4, 70, 70-2, and 70-3 Engines |
Unsafe Condition
Failure of the oil transfer mechanism could result in loss of propeller control.
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Required Actions
Modification G.1920 must be accomplished as described in de Havilland Engine Service Modification News Sheet GQ.70 dated May 8, 1953. If Modification G.1728 is not incorporated, it is recommended to embody it concurrently with Modification G.1920.
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Compliance Time
not later than September 1, 1953
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Affected Aircraft
All Model 70-4 Engines and those 70, 70-2, and 70-3 Engines incorporating Modification G.1493.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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