# Proposed AD FAA-2019-0663: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-02-17
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 6, 2019, 84 FR 46903
- Comments due: October 21, 2019
- Became: [AD 2020-02-17](https://openairdocs.org/ad/2020-02-17)
- Docket: FAA-2019-0663 (https://www.regulations.gov/docket/FAA-2019-0663, where comments are filed)
- FR document: 2019-19104
- Official PDF: https://openairdocs.org/files/sha256/9c/6e/9c6ef8cd6b6265fa597584f1d9df3b007165da04f4508a07f45f4cbe9f0a1cc8 (from https://www.govinfo.gov/content/pkg/FR-2019-09-06/pdf/2019-19104.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/09/06/2019-19104/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4EF5DCB9A4B5BD818625846D00438CD1.0001
- Page: https://openairdocs.org/proposed/FAA-2019-0663

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-70, S-70A, S-70C, S-70C(M), and S-70C(M1) helicopters. This proposed AD was prompted by four incidents of disbonding between the tail rotor (T/R) blade pitch horn and the torque tube. This proposed AD would require recurring visual and tap inspections of the T/R blade, and depending on the outcome, replacing the T/R blade. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 6, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-19104, comments due Oct 21, 2019 (https://www.federalregister.gov/documents/2019/09/06/2019-19104/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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