AD 70-22-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 506 | ROLLS-ROYCE Models Dart 506, 510, and 526 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 510 | ROLLS-ROYCE Models Dart 506, 510, and 526 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 526 | ROLLS-ROYCE Models Dart 506, 510, and 526 Engines |
Unsafe Condition
Annulus gear failure could lead to loss of propeller control.
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Required Actions
Incorporate Rolls-Royce Modifications 1431 (for Model 506) and 1550 (for Models 510 and 526) per specified service bulletins or FAA-approved equivalents.
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Compliance Time
within the next 500 hours' time in service after the effective date of this AD
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Affected Aircraft
Rolls-Royce Models Dart 506, 510, and 526 engines installed on British Aircraft Corporation Viscount 744 and 745D; and Armstrong Whitworth Argosy 650 Series 101 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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