Airworthiness Directive · Amendment 39-12423 · Rolls-Royce Corporation (Formerly Allison Engine Company) AE 2100 Turboprop and AE 3007 Turbofan Series Engines
Rolls-Royce Corporation (Formerly Allison Engine Company) AE 2100 Turboprop and AE 3007 Turbofan Series Engines
This airworthiness directive (AD) is applicable to Rolls-Royce Corporation (formerly Allison Engine Company) models AE 2100A and AE 2100C turboprop engines with high pressure turbine (HPT) wheel part number (P/N) 23050912 installed; AE 2100A turboprop engine with turbine wheel P/N 23063462 serial number (SN) MM14062 installed; AE 2100A, AE 2100C, AE 2100D3 turboprop and AE 3007A, and AE 3007C turbofan engines with 2nd stage HPT wheels with SN's before MM183060. These engines are installed on but not limited to Embraer EMB-145, Cessna 750, SAAB 2000, and Industi Pesawat Terbang Nusantara (IPTN) N-250 series airplanes.
This amendment adopts a new airworthiness directive (AD), that is applicable to Rolls-Royce Corporation (formerly Allison Engine Company) AE 2100 turboprop and AE 3007 turbofan series engines. This amendment requires a one-time acid etch inspection of the 2nd stage high pressure turbine (HPT) wheel for evidence of damaged material indicating that a higher probability of cracking in future service exists. If the etch inspection reveals damage, this AD requires replacement of the turbine wheel with a serviceable part. This amendment is prompted by a report of a 2nd stage HPT wheel that was returned from the field with cracks in the aft bore face. The actions specified by this AD are intended to detect and prevent early development of cracks due to low cycle fatigue of the 2nd stage HPT wheel in the aft bore face that can lead to wheel failure, power loss, and possible damage to the airplane.
