AD 88-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 506 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 510 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 511 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 511-7E | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 514 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 514-7 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 525 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 525F | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 526 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 527 | ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines |
Unsafe Condition
Low cycle fatigue failure of high pressure (HP) impellers and low pressure (LP) impellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service HP and LP impellers based on their modification standards and accumulated flight counts, following specified life limits and schedules. Comply with Rolls-Royce Service Bulletins DA72-496 and 72-463 as referenced.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance is required as indicated, unless already accomplished. Specific schedules include within 400 flights or 12 calendar months from the effective date, whichever comes later, and life limits based on accumulated flights since new.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce plc Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 series engines and all variants.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.