# STC ST50CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Duncan Aviation, United States
- Description: Installation of Collins TCAS 94 TCAS II system.
- Status date: April 5, 1993
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/914415EB4447B39985256CC30003605B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST50CH

## ADs that name it (0)

None.

## Approved models (1)

- Learjet Inc. Learjet 31 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))

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