# Proposed AD 2002-NE-32-AD: NARCO Avionics Inc. AT150 Transponders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-08-16
- Products: Narco Avionics
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 20, 2003, 68 FR 8161
- Comments due: April 21, 2003
- Became: [AD 2004-08-16](https://openairdocs.org/ad/2004-08-16)
- Docket: 2002-NE-32-AD
- FR document: 03-4056
- Official PDF: https://openairdocs.org/files/sha256/27/f5/27f538e9e36d656ec93b30eb93daa502a6a95e02be0e3bf0e83dc301630cdbd9 (from https://www.govinfo.gov/content/pkg/FR-2003-02-20/pdf/03-4056.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/02/20/03-4056/airworthiness-directives-narco-avionics-inc-at150-transponders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/33053FF53967C6DE86256CD3005B01FE.0001
- Page: https://openairdocs.org/proposed/2002-NE-32-AD

## Summary

The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to certain serial numbers (SN's) of NARCO Avionics Inc. AT150 transponders. This proposal would require modification to the transponder by adding a resistor and transistor to the circuit board. This proposal is prompted by reports of AT150 transponders not recognizing and responding properly to Mode S interrogations from Mode S ground stations and Traffic Alert and Collision Avoidance System (TCAS-II) airborne equipment. The actions specified by the proposed AD are intended to prevent loss of aircraft airspace separation and the possibility of mid-air collision.

## Notices in this docket

- Feb 20, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-4056, comments due Apr 21, 2003 (https://www.federalregister.gov/documents/2003/02/20/03-4056/airworthiness-directives-narco-avionics-inc-at150-transponders)

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