46 ADs indexed for Allison Engine Company aircraft.
Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Unsafe Condition: a crack in the 3rd-stage compressor wheel
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Unsafe Condition: A fatigue crack that initiated in the propeller shaft and carrier assembly due to high vibration during a propeller gearbox development test.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Unsafe Condition: The FAA is issuing this AD to address the unsafe condition on these products. The condition, if not addressed, could result in loss of the propeller, damage to the engine, and damage to the airplane.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turbofan Engines
Unsafe Condition: A low-cycle fatigue crack in the dovetail slot for the blade attachment in the 3rd-stage compressor wheel, causing one 3rd-stage compressor blade to release.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turbofan Engines
Airworthiness Directives; Rolls-Royce Corporation Turboprop and Turbofan Engines (Type Certificate Previously Held by Allison Engine Company)
Unsafe Condition: Reports of pitting in the wheel bores and subsequent RRC analysis that concluded that lower life limits are needed for the affected turbine wheels.
Why matched: Airworthiness Directives; Rolls-Royce Corporation Turboprop and Turbofan Engines (Type Certificate Previously Held by Allison Engine Company)
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines
Unsafe Condition: Discovery that several part numbers (P/Ns) of fuel nozzles were inadvertently left out of AD 2004-24-09, which could lead to sudden loss of engine power and uncommanded shutdown of the engine due t...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Unsafe Condition: Failure of gas producer rotor assembly tie bolts due to high cycle fatigue, which could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine fail...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 501-D22A, 501-D22C, and 501-D22G Turboprop Engines
Unsafe Condition: Improper metal hardness of certain 1st stage, 2nd stage, 3rd stage, and 4th stage turbine wheels can lead to over dimensional limits, potentially causing uncontained turbine wheel failure, damage t...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 501-D22A, 501-D22C, and 501-D22G Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (RRC) (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines
Unsafe Condition: Compromised third-stage blade fillet radii leading to increased stresses on the third-stage blades and shroud, which could result in failure of the third-stage turbine wheel.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (RRC) (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 250-B17B, -B17C, -B17D, -B17E, -C20, -C20B, -C20F, -C20J, -C20S, and -C20W Turboprop and Turboshaft Engines
Unsafe Condition: Unacceptable rate of uncontained 1st stage turbine wheel failures.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 250-B17B, -B17C, -B17D, -B17E, -C20, -C20B, - C20F, -C20J, -C20S, and -C20W Turboprop and Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Unsafe Condition: Failure of the compressor adaptor coupling, leading to engine shutdown and loss of all engine power.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines
Unsafe Condition: Collapse of the fuel nozzle screen due to fuel contamination, leading to engine power loss and uncommanded engine shutdown.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) Models 250-C30R/3, -C30R/3M, -C47B, and -C47M Turboshaft Engines
Unsafe Condition: The manufacturer released a redesigned HMU with a dual-element potentiometer to prevent uncommanded and sudden changes in engine power.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) Models 250-C30R/3, -C30R/3M, -C47B, and -C47M Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines
Unsafe Condition: High cycle fatigue causing failure of third-stage turbine blades and shrouds on certain third-stage turbine wheels, part number 6899383, with specific serial numbers.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007 Series Turbofan Engines
Unsafe Condition: Rapid failure of the No. 1 bearing due to bearing material contamination in the engine oil system, which could result in smoke in the cabin and an uncommanded in-flight engine shutdown.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007 Series Turbofan Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007A1, AE 3007A1/1, AE 3007A1/3, AE 3007A3, AE 3007A1E, and AE 3007A1P Turbofan Engines
Unsafe Condition: Aft pilot tangs on a 1st to 2nd stage turbine spacer were found bent and cracked, prompting concern about potential spacer failure leading to uncontained turbine failure, engine shutdown, and damag...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007A1, AE 3007A1/1, AE 3007A1/3, AE 3007A3, AE 3007A1E, and AE 3007A1P Turbofan Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 501-D Series Turboprop Engines
Unsafe Condition: Recalculated material properties indicate potential failure of turbine rotor components at reduced life limits, leading to uncontained turbine rotor failure, in-flight engine shutdown, and possible...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 501-D Series Turboprop Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 250-C28 Series Engines
Unsafe Condition: Potential uncommanded engine shutdown caused by fractures of third stage turbine blade tips and shrouds.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 250-C28 Series Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007 Series Turbofan Engines
Unsafe Condition: Low-cycle fatigue (LCF) failure of cone shafts, which could result in an uncontained engine failure and damage to the airplane.
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007 Series Turbofan Engines
Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) Model AE 3007A and AE 3007C Turbofan Engines
Unsafe Condition: HPT 1st to 2nd stage turbine spacer stresses are higher than predicted, which could result in HPT 1st to 2nd stage turbine spacer failure and an uncontained engine failure, leading to damage to the...
Why matched: Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) Model AE 3007A and AE 3007C Turbofan Engines