Airworthiness directives › 2021-15-12
AD 2021-15-12 Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines
Applicability*9
This AD applies to Pratt & Whitney Canada Corp. (P&WC) PW210A and PW210S model turboshaft engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
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, which could result in the failure of these components. The FAA is issuing this AD to prevent failure of the impeller and the HPC rotor. The unsafe condition, if not addressed, could result in the uncontained release of the impeller or the HPC rotor, damage to the engine, damage to the helicopter, and loss of control of the helicopter.
Affected ADs
None.
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