# Proposed AD FAA-2021-0103: Pratt & Whitney Canada Corp. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Pratt & Whitney Canada
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 26, 2021, 86 FR 11651
- Comments due: April 12, 2021
- Docket: FAA-2021-0103 (https://www.regulations.gov/docket/FAA-2021-0103, where comments are filed)
- Project: MCAI-2020-00604-E
- FR document: 2021-03814
- Official PDF: https://openairdocs.org/files/sha256/de/3a/de3ac9dca992380cdc3f57308d1444d9c26dc1a44aaac9209d19d0595a79d265 (from https://www.govinfo.gov/content/pkg/FR-2021-02-26/pdf/2021-03814.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/02/26/2021-03814/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/86E6389B92A456B9862586880068633F.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0103

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PW210A and PW210S model turboshaft engines. This proposed 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. The impeller and HPC rotor are both life-limited components and exceeding their published life limits could result in the failure of these components. This proposed AD would require the 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 proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 26, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-03814, comments due Apr 12, 2021 (https://www.federalregister.gov/documents/2021/02/26/2021-03814/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines)

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