Airworthiness Directive · Amendment 39-21659 · Turbine engine compressor section
Pratt & Whitney Canada Corp. Turboshaft Engines
This AD applies to Pratt & Whitney Canada Corp. (P&WC) PW210A and PW210S model turboshaft engines.
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PW210A and PW210S model turboshaft engines. This AD was prompted by a report from the manufacturer that the Automated Damage Tracking System (ADTS) may under-count the number of cycles accrued by the impeller and the high-pressure compressor (HPC) rotor. This AD requires use of the manual low-cycle fatigue (LCF) counting method in place of the ADTS counting method to determine the number of cycles accrued by the impeller and HPC rotor. The FAA is issuing this AD to address the unsafe condition on these products.
Before exceeding 7,000 starts or 14,000 flight cycles since new on the affected engine, or prior to removal of the engine from the aircraft for the purpose of sending the engine to a repair or overhaul facility, whichever occurs first after the effective date of this AD:
(1) Use the manual low-cycle fatigue (LCF) counting method to determine the accumulated LCF cycles for the impeller and the HPC rotor using paragraph 3.A., Accomplishment Instructions, of P&WC Alert Service Bulletin (ASB) No. PW210-72-A57142, Revision No. 1, dated March 26, 2020, or P&WC ASB No. PW210-72-A57143, Revision No. 1, dated March 26, 2020, as applicable for the engine model.
(2) After performing the actions required by paragraph (g)(1) of this AD, use the manual LCF counting method specified in paragraph (g)(1) of this AD to count subsequent LCF cycles on the impeller and HPC rotor. Do not use the ADTS to count subsequent LCF cycles on the impeller or the HPC rotor.
For the purpose of this AD, a “start” is an engine start followed by one or more flights.
The reporting requirement specified in the Accomplishment Instructions, paragraph 3.A.4., of P&WC ASB No. PW210-72-A57142, Revision No. 1, dated March 26, 2020, and paragraph 3.A.4., of P&WC ASB No. PW210-72-A57143, Revision No. 1, dated March 26, 2020, is not required by this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
