# Proposed AD 96-NM-81-AD: Allied Signal Commercial Avionics Systems CAS-81 Traffic Alert and Collision Avoidance Systems (TCAS) as Installed In, But Not Limited To, Various Transport Category Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 95-26-15 R1
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 5, 1996, 61 FR 28518
- Comments due: July 15, 1996
- Became: [AD 95-26-15 R1](https://openairdocs.org/ad/95-26-15-R1)
- Docket: 96-NM-81-AD
- FR document: 96-14038
- Official PDF: https://openairdocs.org/files/sha256/09/67/09671a9988075d50f5c4b33dc1bf665585325b64dcc912f707fb4d97500cd679 (from https://www.govinfo.gov/content/pkg/FR-1996-06-05/pdf/96-14038.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/06/05/96-14038/airworthiness-directives-allied-signal-commercial-avionics-systems-cas-81-traffic-alert-and
- Page: https://openairdocs.org/proposed/96-NM-81-AD

## Summary

This document proposes to revise an existing airworthiness directive (AD), applicable to various transport category airplanes equipped with Allied Signal Commercial Avionics Systems CAS-81 TCAS. That AD currently requires a revision to the Airplane Flight Manual (AFM) to provide the flightcrew with procedures to cycle power to the TCAS processor via the circuit breaker or power bus, and to perform a TCAS functional test to verify proper operation of the TCAS. That action was prompted by reports of failure of the audio output of the CAS-81 TCAS. The actions specified by that AD are intended to ensure that the flightcrew is advised of the potential hazard associated with failure of the audio output of the CAS-81 TCAS, and of the procedures necessary to address it. This action would add a revision of the AFM requirements that would provide an alternative method of compliance with the currently required AFM revision; and would provide for a modification to the TCAS processor, which, if accomplished, terminates the requirements of the AD.

## Notices in this docket

- Jun 5, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-14038, comments due Jul 15, 1996 (https://www.federalregister.gov/documents/1996/06/05/96-14038/airworthiness-directives-allied-signal-commercial-avionics-systems-cas-81-traffic-alert-and)

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