# Airworthiness Directives; Rockwell Collins, Inc., Global Positioning Systems
> **Rule** · Final rule. · Published 2021-04-07 · Effective 2021-05-12 · 86 FR 17902
## Document
- **Document number:** 2021-07015
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 17902
- **Publication date:** 2021-04-07
- **Effective date:** 2021-05-12
- **FAA docket:** Docket No. FAA-2020-0915
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Rockwell Collins, Inc. (Rockwell Collins), GPS-4000S Global Positioning Systems (GPS) installed on airplanes. This AD was prompted by an un-annunciated GPS position error, which could cause a misleading localizer performance with vertical guidance (LPV) glidepath, resulting in controlled flight into terrain (CFIT). This AD requires upgrading the GPS-4000S. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/04/07/2021-07015/airworthiness-directives-rockwell-collins-inc-global-positioning-systems)
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