# Airworthiness Directives; Rockwell Collins, Inc. Traffic Surveillance System Processing Unit
> **Rule** · Final rule. · Published 2017-11-15 · Effective 2017-12-20 · 82 FR 52827
## Document
- **Document number:** 2017-24066
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 52827
- **Publication date:** 2017-11-15
- **Effective date:** 2017-12-20
- **FAA docket:** Docket No. FAA-2017-0659
## Abstract

We are adopting a new airworthiness directive (AD) for certain Rockwell Collins, Inc. TSS-4100 Traffic Surveillance System Processing Units that incorporate TSSA-4100 Field Loadable Software (FLS) Rockwell Collins part numbers 810-0052-002/-003/-010/-011/-012/-100/-101 and are installed on airplanes. This AD was prompted by five instances of air traffic control observing coasting (extrapolated stale data) of automatic dependent surveillance-broadcast data (position/velocity data). This AD requires installing the TSSA-4100 FLS upgrades on the TSS-4100 units. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/11/15/2017-24066/airworthiness-directives-rockwell-collins-inc-traffic-surveillance-system-processing-unit)
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