# STC SA4-1647

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Staggerwing Museum Foundation Inc., United States
- Description: Installation of Janitrol Model S-25 Heater in each nacelle in the area over wing and behind firewall.  225 CFM ground blower left wing only.  Limited to installation on model C-45H, serial number AF817 ONLY.
- Applied: October 23, 1961
- Status date: September 3, 2004
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-765](https://openairdocs.org/tcds/A-765)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9AC120AB0962F7D9862570CE0078BA7D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-1647

## ADs that name it (0)

None.

## Approved models (1)

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

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