# STC SA4320SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Textron Aviation Inc, United States
- Description: Installation of Radio Master switch system for Sperry/Collins dual radio system.
- Applied: March 28, 1979
- Status date: January 25, 2017
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A3EU](https://openairdocs.org/tcds/A3EU)
- Certificate PDF: https://openairdocs.org/files/sha256/3b/3e/3b3e7af0e7beee272527d690bdc8a9642846f20f7f4af31ac86d02cb39940f38
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1A41263F8FED6653862581590056A940.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4320SW

## ADs that name it (0)

None.

## Approved models (2)

- Beechcraft Corporation BAe.125 Series 800A ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))
- Beechcraft Corporation HS.125 Series 700A ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))

## 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 Textron Aviation Inc.

One Cessna Boulevard Wichita, KS 67215 2 SA4320SW Civil Air Regulations.

4b Installation of Radio Master Switch System for Sperry/Collins Dual Radio System in accordance with Arkansas Modification Center Drawing List No. 125-019, revision F1 dated 7/8/90, or later FAA approved revision.

One of the following FAA Approved Flight Manual Supplements, or later FAA approved revision, is required:

Supplement dated 11/18/83, rev. A dated 6/10/85 for the HS.125-700A; Supplement dated 6/10/85 for Dual Sperry Radio on the BAe 125-800; Supplement dated 7/16/90 for Dual Collins Radio on the BAe 125-800. Compatibility of this modification with previously installed equipment must be determined by installer.

British Aero HS 125-700A; BAe 125-800A January 25, 2017 November 18, 1983; June 10, 1985; July 16, 1990 March 28, 1979 March 30, 1981 A3EU Mark Fuller STC ODA administrator ODA-100129-CE

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

To (Name and address of transferee)

From (Name and address of grantor)

## Every issue (2)

- January 25, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3b/3e/3b3e7af0e7beee272527d690bdc8a9642846f20f7f4af31ac86d02cb39940f38)
- July 16, 1990: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/63/03/6303af0c8605d03e6bff35679a412d29c209091cda80ce90f0abcbd71b508303)

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