# Proposed AD FAA-2006-24101: Sandel Avionics Incorporated Model ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator Approved Under Technical Standard Order(s) C113, C151a, or C151b; Installed on Various Small and Transport Category Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-16-18
- Products: Sandel Avionics
- Product type: Appliance
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 8, 2006, 71 FR 11549
- Comments due: April 24, 2006
- Became: [AD 2006-16-18](https://openairdocs.org/ad/2006-16-18)
- Docket: FAA-2006-24101 (https://www.regulations.gov/docket/FAA-2006-24101, where comments are filed)
- Project: 2005-NM-103-AD
- FR document: E6-3262
- Official PDF: https://openairdocs.org/files/sha256/36/9f/369fbe6692c191021b374cf3c5c9d8a2fe6d71cc8e4ef714ead30cfad96d2d9e (from https://www.govinfo.gov/content/pkg/FR-2006-03-08/pdf/E6-3262.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/03/08/E6-3262/airworthiness-directives-sandel-avionics-incorporated-model-st3400-terrain-awareness-warning
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B8EE92E47B291B38625712B005DDE54.0001
- Page: https://openairdocs.org/proposed/FAA-2006-24101

## Summary

The FAA proposes to adopt a new airworthiness directive (AD). The new AD is for Sandel Avionics Incorporated Model ST3400 terrain awareness warning systems/radio magnetic indicator (TAWS/RMI) units as described above. This proposed AD would require installing a warning placard on the TAWS/RMI, installing upgraded software in the TAWS/RMI, revising the limitations section of the Airplane Flight Manual (AFM), and removing the placard and AFM revision after installing the software. This proposed AD results from a report that an in-flight bearing error occurred in a Model ST3400 TAWS/RMI, due to a combination of input signal fault and software error. We are proposing this AD to prevent a bearing error, which could lead to an airplane departing from its scheduled flight path, which could result in a reduction in separation from, and a possible collision with, other aircraft or terrain.

## Notices in this docket

- Mar 8, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-3262, comments due Apr 24, 2006 (https://www.federalregister.gov/documents/2006/03/08/E6-3262/airworthiness-directives-sandel-avionics-incorporated-model-st3400-terrain-awareness-warning)

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