AD 99-03-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | AE 2100A | Airworthiness Directives; Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 Series Turboprop Engines |
| engine | Rolls-Royce Corporation | AE 2100C | Airworthiness Directives; Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 Series Turboprop Engines |
| engine | Rolls-Royce Corporation | AE 2100D3 | Airworthiness Directives; Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 Series Turboprop Engines |
Unsafe Condition
Tungsten contamination and reduced cyclic life limits due to surface treatment reevaluation could result in uncontained turbine wheel failure.
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Required Actions
Remove from service turbine wheels prior to exceeding new reduced cyclic life limits and replace with serviceable parts as specified in Rolls-Royce Alert Service Bulletins AE 2100A-A-72-191, AE 2100C-A-72-141, and AE 2100D3-series applicable bulletins. Specific limits include 8,900 cycles since new (CSN) for 4th stage wheels and varying limits (10,000 to 12,400 CSN) based on part numbers and serial numbers listed in the bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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