# STC ST09509SC

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Department of Justice, United States
- Description: Installation of an AlliedSignal CAS 67 TCAS II system with AlliedSignal MST 67A Mode S transponder.
- Status date: November 1, 2001
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B402EFB5AAA56D6C85256CC300035E45.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/ST09509SC

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-9-15 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

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