AD 86-20-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 506 | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 510 | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 511 | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 511-7E | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 514 | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 514-7 | ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines |
Unsafe Condition
Cracking of high pressure turbine disks
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Required Actions
Install new or reworked oversize high pressure nozzle guide vane(s) in accordance with Rolls-Royce Service Bulletin Da72-451, Revision 5, dated June 1982, or FAA approved equivalent.
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Compliance Time
by October 1, 1987
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Affected Aircraft
Rolls-Royce Deutschland Ltd & Co KG Dart 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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