# STC SA174AL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aircraft Innovations, LLC, United States
- Description: Installation of Stewart-Warner Model 940-F24 heater
- Applied: September 11, 2009
- Status date: September 11, 2009
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-757](https://openairdocs.org/tcds/A-757)
- Certificate PDF: https://openairdocs.org/files/sha256/c5/98/c59823952d82a4b2fbb5b8a34e905992c32ece9103b1e1cd4a8dfca7e92a1260
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CB069F3BC62CAE4186257639005C7F10.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA174AL

## ADs that name it (0)

None.

## Approved models (1)

- Hawker Beechcraft Corporation C18S ([TCDS A-757](https://openairdocs.org/tcds/A-757))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

This certificate issued to Aircraft Innovations, LLC PO Box 110164 Anchorage, AK 99511

Part 4a of the Civil Air Regulations.

Original Product — Type Certificate Number: 757 Make: Beech Model: C18S

Description of Type Design Change: Installation of Stewart-Warner Model 940-F24 heater, per Shaw Flight Service sketch and photographs 1 through 6 dated February 1, 1966.

1. Data pertaining to this modification are considered inadequate for duplication in other aircraft.

2. This approval is limited to the installation of Stewart-Warner Model 940-F24 heater on Beech C18S airplane, R/N N445, S/N 8229 only. No additional modifications of this type are to be approved solely by reference to this supplemental type certificate, or to the data submitted therefore.

3. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of application: February 1, 1966 Date reissued : July 1, 1975; May 28, 1975;

April 19, 1975; September 11, 2009

Date of issuance: February 8, 1966 Date amended: September 11, 2009

( Signature) David D. Swartz Acting Manager, Anchorage Aircraft Certification Office

( Title)

## Every issue (1)

- September 11, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c5/98/c59823952d82a4b2fbb5b8a34e905992c32ece9103b1e1cd4a8dfca7e92a1260)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.