# STC ST00020WI-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Rockwell Collins Inc, United States
- Description: Installation of alternate Collins TTR-920 TCAS R/T and dual Collins TDR-94D Mode S transponders.
- Status date: January 22, 1993
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A13NM](https://openairdocs.org/tcds/A13NM)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/27560D599803AD8485256CC2006A6F4C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST00020WI-D

## ADs that name it (0)

None.

## Approved models (2)

- Bombardier-Rotax GmbH DHC-8-100 Series ([TCDS A13NM](https://openairdocs.org/tcds/A13NM))
- Bombardier-Rotax GmbH DHC-8-300 Series ([TCDS A13NM](https://openairdocs.org/tcds/A13NM))

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