# STC SA537SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Bendix Corporation Avionics Div, United States
- Description: Installation of Bendix YD-4 yaw damper.
- Status date: May 15, 1973
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A20](https://openairdocs.org/tcds/3A20)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/62E2ABE4E0218B9285256CC2001228C0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA537SO

## ADs that name it (0)

None.

## Approved models (1)

- Raytheon Aircraft Company C90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))

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