# Airworthiness Directives; Rockwell Collins, Inc. Flight Display System Application
> **Rule** · Final rule. · Published 2021-03-25 · Effective 2021-04-29 · 86 FR 15788
## Document
- **Document number:** 2021-06156
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 15788
- **Publication date:** 2021-03-25
- **Effective date:** 2021-04-29
- **FAA docket:** Docket No. FAA-2020-0883
## Abstract

The FAA is superseding Airworthiness Directive (AD) AD 2019- 12-09 for certain Rockwell Collins, Inc. (Rockwell Collins) FDSA-6500 flight display system applications installed on airplanes. AD 2019-12- 09 imposed operating limitations on the traffic collision avoidance system (TCAS). AD 2019-12-09 was prompted by conflict between the TCAS display indications and aural alerts that may occur during a resolution advisory (RA) scenario. This AD retains the requirements of AD 2019-12- 09 until a software upgrade is completed. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/25/2021-06156/airworthiness-directives-rockwell-collins-inc-flight-display-system-application)
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