# Proposed AD FAA-2018-1081: Trig Avionics Limited Transponders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-13-03
- Products: Trig Avionics
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 22, 2019, 84 FR 10735
- Comments due: May 6, 2019
- Became: [AD 2019-13-03](https://openairdocs.org/ad/2019-13-03)
- Docket: FAA-2018-1081 (https://www.regulations.gov/docket/FAA-2018-1081, where comments are filed)
- FR document: 2019-05458
- Official PDF: https://openairdocs.org/files/sha256/b1/a3/b1a33fa145843a74ff0832868b239ba9d33a225b378eaa5e2959af063c6f55e8 (from https://www.govinfo.gov/content/pkg/FR-2019-03-22/pdf/2019-05458.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/03/22/2019-05458/airworthiness-directives-trig-avionics-limited-transponders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B9E97B75D66EF758862583C9005E7D57.0001
- Page: https://openairdocs.org/proposed/FAA-2018-1081

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Trig Avionics Limited TT31, Avidyne Corporation AXP340, and BendixKing/Honeywell International KT74 Mode S transponders. This proposed AD was prompted by the discovery that the retaining cam that engages in the mounting tray may not withstand g-forces experienced during an emergency landing. This proposed AD would require a one-time inspection of the transponder installation to determine if this is a conventional aft-facing installation, and depending on the findings, removal of the affected transponder for modification. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 22, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-05458, comments due May 6, 2019 (https://www.federalregister.gov/documents/2019/03/22/2019-05458/airworthiness-directives-trig-avionics-limited-transponders)

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