AD 2001-19-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | plc Dart 525 | Airworthiness Directives; Rolls-Royce plc Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 Series Turboprop Engines |
Unsafe Condition
Fretting, wear, and open clearance between the HPT disc diaphragm seal arm and IPT disc diaphragm seal arm can result in a high-response disc vibration mode, leading to high-cycle-fatigue (HCF) fractures in the HPT disc, which could cause HPT disc failure and an uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove certain part number (P/N) high pressure turbine (HPT) discs and replace them with serviceable discs. The replacement schedule is based on risk analysis and provides owners/operators adequate time to comply.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified replacement schedule based on risk analysis.
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Affected Aircraft
Rolls-Royce plc Dart 525, 525F, 528, 528D, 529, 529D, 530, 532, 535, 542, and 552 series turboprop engines containing HPT discs with the listed part numbers in Table 1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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