AD 2012-14-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | Corporation | Airworthiness Directives; Rolls-Royce Corporation Turboshaft Engines |
Unsafe Condition
seven cases reported of released turbine blades and shrouds, which led to loss of power and engine in-flight shutdowns
Required Actions
remove the 3rd stage turbine wheel, P/N 23065818, and the 4th stage turbine wheel, P/N 23055944, within 1,750-hours since last inspection, perform a one-time visual inspection and a fluorescent penetrant inspection on the 3rd and 4th stage turbine wheels for cracks at the trailing edge of the turbine blades near the fillet at the rim, if any cracks in the trailing edge near the rim are detected, do not return the wheel to service
Compliance Time
within 1,750-hours since last inspection
Affected Aircraft
Rolls-Royce Corporation 250-C20, -C20B, and -C20R/2 turboshaft engines with 3rd stage turbine wheel, part number (P/N) 23065818, and 4th stage turbine wheel, P/N 23055944
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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