# STC SA4-554

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aerospace Products, Inc, United States
- Description: Installation of stabilizer angle of incidence change.
- Status date: January 9, 1975
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-765](https://openairdocs.org/tcds/A-765)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FE5C5F10060530BB85256CC2000C5EF6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-554

## ADs that name it (0)

None.

## Approved models (5)

- Raytheon Aircraft Company C-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company C-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company D18S ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company TC-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company TC-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))

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