# STC SA4-120

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Staggerwing Museum Foundation Inc., United States
- Description: Dual airspeed system.
- Applied: October 1, 1956
- Status date: October 6, 2006
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-2-582](https://openairdocs.org/tcds/A-2-582), [TCDS A-757](https://openairdocs.org/tcds/A-757), [TCDS A-765](https://openairdocs.org/tcds/A-765)
- Certificate PDF: https://openairdocs.org/files/sha256/9d/00/9d00d59535645da2ab1f9c01432ceab7dd8fe08fda29351af3e39564a271c158
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B884D34771F343BA85256CC2000C5CF7.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-120

## ADs that name it (0)

None.

## Approved models (7)

- Hawker Beechcraft Corporation Army AT-11 ([TCDS A-2-582](https://openairdocs.org/tcds/A-2-582))
- Hawker Beechcraft Corporation C-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Hawker Beechcraft Corporation C-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Hawker Beechcraft Corporation C18S ([TCDS A-757](https://openairdocs.org/tcds/A-757))
- Hawker Beechcraft Corporation D18S ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Hawker Beechcraft Corporation TC-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Hawker Beechcraft Corporation TC-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))

## 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: Staggerwing Museum Foundation, Inc.

560 Old Shelbyville Hwy Tullahoma, TN 37388

Part * of the Civil Air Regulations. * CAR 4a for AT-11 and C18S; CAR 03 effective 11/13/45 for all other Models specified below.

Original Product - Type Certificate Number : 757 2-582 765 Make : Beech Beech Beech Model : C18S AT-11 D18S, C-45G/H, and TC-45G/H

Installation of Dual Airspeed Indicating System in accordance with Airline Training, Inc. Drawing No. ATI-103 and 71002 or 71002 Change A for Model AT-11 only; for other Models specified above, Drawings 71001, or 71001 Changes A, B or C, and 71002 or 71002 Change A are applicable.

Airworthiness compatibility of this STC with all other major changes to the standard original model(s) shown above should be confirmed prior to installation of this STC. 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 reissued : May 22, 1967; August 15, 1968;

February 26, 1990; October 6, 2006 Date amended : March 6, 1961

Original signed by Robert D. Adamson

( Signature) Robert D. Adamson Program Manager Wichita Aircraft Certification Office (Title) Date of application : October 1, 1956 Date of issuance : October 15, 1956

## Every issue (1)

- October 6, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/9d/00/9d00d59535645da2ab1f9c01432ceab7dd8fe08fda29351af3e39564a271c158)

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