# Proposed AD FAA-2021-1002: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-03-09
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 16, 2021, 86 FR 63322
- Comments due: January 3, 2022
- Became: [AD 2022-03-09](https://openairdocs.org/ad/2022-03-09)
- Docket: FAA-2021-1002 (https://www.regulations.gov/docket/FAA-2021-1002, where comments are filed)
- Project: AD-2021-00332-R
- FR document: 2021-24956
- Official PDF: https://openairdocs.org/files/sha256/cb/ac/cbac3c629022e01c0c9fb045deac988dfadb7fe61fb8b28369066f0def0ffef2 (from https://www.govinfo.gov/content/pkg/FR-2021-11-16/pdf/2021-24956.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/11/16/2021-24956/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-24956-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1002

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation Model S-76D helicopters. This proposed AD was prompted by reports that certain Thales global positioning system (GPS) satellite based augmentation system (SBAS) receivers provided, under certain conditions, erroneous outputs on aircraft positions. This proposed AD would require replacing affected GPS receivers and prohibit installing those GPS receivers. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 16, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-24956, comments due Jan 3, 2022 (https://www.federalregister.gov/documents/2021/11/16/2021-24956/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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