AD 99-17-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | AE 2100A | Airworthiness Directives; Allison Engine Company, Inc AE 2100A and AE 2100C Series Turboprop Engines |
| engine | Rolls-Royce Corporation | AE 2100C | Airworthiness Directives; Allison Engine Company, Inc AE 2100A and AE 2100C Series Turboprop Engines |
Unsafe Condition
Propeller Gearbox (PGB) and Power Section (P/S) strut fitting notches and cracks cause concentrated stress regions leading to cracks, which could result in PGB misalignment, in-flight engine shutdown, and possible loss of the propeller.
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Required Actions
Perform initial and repetitive visual inspections of PGB and P/S strut fittings for notches and cracks. Replace cracked parts prior to further flight. Replicate inspections at intervals of 100 or 400 hours TIS based on notch presence. Rework strut fittings to latest configuration with new part numbers.
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Compliance Time
Initial inspection within 100 hours time-in-service after the effective date (September 7, 1999).
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Affected Aircraft
Allison Engine Company AE 2100A and AE 2100C series turboprop engines installed on SAAB 2000 and IPTN N-250 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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