# Proposed AD FAA-2017-0522: Northrop Grumman LITEF GmbH LCR-100 Attitude and Heading Reference System Units

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-07-10
- Products: Northrop Grumman
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 5, 2017, 82 FR 25742
- Comments due: August 4, 2017
- Became: [AD 2019-07-10](https://openairdocs.org/ad/2019-07-10)
- Docket: FAA-2017-0522 (https://www.regulations.gov/docket/FAA-2017-0522, where comments are filed)
- Project: 2015-SW-068-AD
- FR document: 2017-11132
- Official PDF: https://openairdocs.org/files/sha256/33/71/337138b2a97ec4df07179e3aa7a9f5448d0316c32baadf5284fdddd92fba285b (from https://www.govinfo.gov/content/pkg/FR-2017-06-05/pdf/2017-11132.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/06/05/2017-11132/airworthiness-directives-northrop-grumman-litef-gmbh-lcr-100-attitude-and-heading-reference-system
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1ACF2184DA0B246286258136004C6739.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0522

## Summary

We propose to adopt a new airworthiness directive (AD) for Northrop Grumman LITEF GmbH LCR-100 Attitude and Heading Reference System (AHRS) units installed on various aircraft. This proposed AD would require removing certain LCR-100 AHRS units from service. This proposed AD is prompted by test results showing loss of or invalid data. The proposed actions are intended to prevent an unsafe condition on these products.

## Notices in this docket

- Jun 5, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-11132, comments due Aug 4, 2017 (https://www.federalregister.gov/documents/2017/06/05/2017-11132/airworthiness-directives-northrop-grumman-litef-gmbh-lcr-100-attitude-and-heading-reference-system)

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