# STC SA3-50

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sabreliner Aviation LLC, United States
- Description: Modification of Stewart-Warner Model 940-B24 heater installation.
- Applied: December 22, 1956
- Status date: March 7, 2014
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/7e/09/7e09264370cd8e646798d7e74dcbed56fc22d2f13785d7c8e9458aaffe51fb87
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E2CA9CF40C6F4F9686257E65006DA218.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3-50

## ADs that name it (0)

None.

## Approved models (5)

- The Boeing Company DC3A-S1C3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S1CG ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-S4C4G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SC3G ([TCDS A-669](https://openairdocs.org/tcds/A-669))
- The Boeing Company DC3A-SCG ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## 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.

FAA Form 8110-2 (5/14) Page 1 of

Part of the

Signature

Title SA3-50 Sabreliner Aviation, LLC.

1390 Highway H Perryville, MO 63775 SR-407 2 Civil Air Regulations.

A-669 DC-3A Modification of Stewart-Warner Model 940-B24 Heater Installation. Data Required: Remmert-Werner Drawing No's.

DC3-48000, Rev. A (2 sheets); DC3-48128, Rev. B; SK-10154; and ACA-337 dated December 20, 1958, or later FAA approved revision.

This is a modification to Reading Aviation (Repair Station) Installation. Field Approval ACA-337, dated November 26, 1957. Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation made in Douglas DC-3A, Serial No. 4992 only.

Douglas October 1, 1970; March 25, 1981; June 30, 1983;

March 7, 2014 December 22, 1956 June 17, 1957 July 22, 1958 Grant E. Youngdahl Program Manager Wichita Aircraft Certification Office

FAA Form 8110-2 (5/14) Page 2 of

To (Name and address of transferee)

From (Name and address of grantor)

2 SA3-50

## Every issue (1)

- March 7, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/7e/09/7e09264370cd8e646798d7e74dcbed56fc22d2f13785d7c8e9458aaffe51fb87)

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