# Proposed AD FAA-2017-0658: GE Aviation Czech s.r.o. Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-03-22
- Products: GE Aviation Czech s.r.o.
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 22, 2017, 82 FR 44355
- Comments due: November 6, 2017
- Became: [AD 2018-03-22](https://openairdocs.org/ad/2018-03-22)
- Docket: FAA-2017-0658 (https://www.regulations.gov/docket/FAA-2017-0658, where comments are filed)
- FR document: 2017-19969
- Official PDF: https://openairdocs.org/files/sha256/61/25/61251f963ed722097ff0f8c03797d6af4a1f9460de07b590502ce8210df636c5 (from https://www.govinfo.gov/content/pkg/FR-2017-09-22/pdf/2017-19969.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/09/22/2017-19969/airworthiness-directives-ge-aviation-czech-sro-turboprop-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CB7069639350862C862581A3005A3AD6.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0658

## Summary

We propose to adopt a new airworthiness directive (AD) for certain GE Aviation Czech s.r.o. M601D-11, M601E-11, M601E-11A, M601E- 11AS, M601E-11S, and M601F turboprop engines. This proposed AD was prompted by a review that determined that certain power turbine (PT) rotors have less overspeed margin than originally declared during product certification. This proposed AD would require removal of the affected PT disks. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Sep 22, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-19969, comments due Nov 6, 2017 (https://www.federalregister.gov/documents/2017/09/22/2017-19969/airworthiness-directives-ge-aviation-czech-sro-turboprop-engines)

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