# Proposed AD FAA-2013-0966: Rockwell Collins, Inc. Transponders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2014-05-27
- Products: Rockwell Collins
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 19, 2013, 78 FR 69318
- Comments due: January 3, 2014
- Became: [AD 2014-05-27](https://openairdocs.org/ad/2014-05-27)
- Docket: FAA-2013-0966 (https://www.regulations.gov/docket/FAA-2013-0966, where comments are filed)
- Project: 2013-CE-040-AD
- FR document: 2013-27640
- Official PDF: https://openairdocs.org/files/sha256/dc/9d/dc9d1ca8fd8fc8c2a8db4bb33e30eb5912b9c9a746c6b9c99b1aaf3c8f49a399 (from https://www.govinfo.gov/content/pkg/FR-2013-11-19/pdf/2013-27640.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/11/19/2013-27640/airworthiness-directives-rockwell-collins-inc-transponders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A632DB3363A3363286257C2800502C20.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0966

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Rockwell Collins TPR-720 and TPR-900 Mode select (S) transponders that are installed on airplanes. This proposed AD was prompted by the identification that the TPR-720 and TPR-900 Mode S transponders respond intermittently to Mode S interrogations from both ground-based and traffic collision avoidance system (TCAS-) equipped airplanes. This proposed AD would require testing and calibration of the alignment of the transponders. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Nov 19, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-27640, comments due Jan 3, 2014 (https://www.federalregister.gov/documents/2013/11/19/2013-27640/airworthiness-directives-rockwell-collins-inc-transponders)

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