AD 99-04-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 525 | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 525F | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 526 | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 527 | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 528-7E | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 528D-7E | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 529-7E | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 529-7H | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 529-8E | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Dart 529-8H | Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines |
Unsafe Condition
High pressure turbine (HPT) disk rupture caused by high cycle fatigue (HCF) induced by a once-per-revolution resonance force resulting from fuel burner malfunction.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive fuel burner fuel flow calibration checks, and overhaul or replace fuel burners in accordance with Rolls-Royce Alert Service Bulletin Da73-A87. Actions must be completed by the earliest of engine overhaul or before exceeding 3,000 hours time in service since last fuel burner calibration.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to exceeding 3,000 hours time in service (TIS) since last fuel burner calibration or at engine overhaul, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Limited Dart 525 series, 526, 527, 528 series, 529 series, 530, 531, 532 series, 535 series, 542 series, and 552 series turboprop engines installed on specified aircraft models.
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
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