# STC SA420WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aerotech Industries, Canada
- Description: Installation of Stewart-Warner Series 940 combustion heaters in nacelle turtlebacks.
- Status date: February 10, 1998
- 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/5F71B60BC103D9BF85256CC2000E3A7E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA420WE

## ADs that name it (0)

None.

## Approved models (4)

- 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 UC-45J (SNB-5) ([TCDS A-765](https://openairdocs.org/tcds/A-765))

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.