# STC SA745SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system AK235, Century III autopilot with optional pitch trim and/or radio coupler.
- Applied: December 16, 1966
- Status date: June 25, 1984
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-765](https://openairdocs.org/tcds/A-765)
- Certificate PDF: https://openairdocs.org/files/sha256/37/e7/37e794675cdd43349bc6ee6d02d693eb542f8ad580c6e1a309e2891dc77ad53c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9DF62486C603E4AB85256CC20056A341.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA745SW

## ADs that name it (1)

- [AD 70-15-18](https://openairdocs.org/ad/70-15-18): Automatic Pilot and Automatic Aileron Stabilizer Instruments · Mitchell Industries Auto Pilot Systems Instruments. Effective Aug 31, 1970. Cited in the text

## Approved models (17)

- Raytheon Aircraft Company 3N ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company 3NM ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company 3TM ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company C-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company C-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company D18C ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company D18S ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company E18S ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company E18S-9700 ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company G18S ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company H18 ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company JRB-6 ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company RC-45J (SNB-5P) ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company TC-45G ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company TC-45H ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company TC-45J ([TCDS A-765](https://openairdocs.org/tcds/A-765))
- Raytheon Aircraft Company UC-45J (SNB-5) ([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.

Bcpartment of transportation -federal Stoiation administration Supplemental i:uje Certificate isKivmdW' SA745SW Century Flight Systems, Inc.

P.M. 1195 P. 0. Box 610 Mineral Wells, IX 76067 4tojfy^i&de4jjam^^4fae'Ji>&c^^ .Jb'*U*W(>r^ 3 ^.J&t, Civil Air 765 : Beech JRB-6, DISC, D18S, E18S, E18S-9700, G18S, H18, RC45J, 3N, 3NM, 3TM, C45G, C45H, TC-45G, TC-45H, and TC-45J(SNB-5) See Continuation Sheet, Page 2, a part of this STC previously approved modifications

a.4*~r--cu*iSvP<'i>GtAnji//*t>>'nMt/n' tms^fifef/Mn/i<vA*&r~ /^^ .

December 16, 1966 January 13, 1967 «* — /: 9-29-71; 8-31-73; 4-22-75;

6-25-84, Revision 4 nr ,u/*</:

Don P. Watson Manager, Aircraft Certification Division Southwest Region (Till*)

THis certificate may be transferred in accordance with FAR 21.17.

**FAAFMM 8110-2 (10-68)**

Unfed gtatu of amcrica Bepartment of ^transportation— Jf etoral atrtation administration 3uppltmtntal l^gpc Certificate(Continuation $heet) SA745SW, Revision A, dated 6-25-84 DESCRIPTION OF TYPE DESIGN CHANGE:

Installation of Mitchell Automatic Flight System Model AK235 consisting of Century III Autopilot with optional Automatic Pitch Trim, Radio Coupler, and Glide Slope Coupler according to Bulletin No. 344 Revision (5) dated 3-5-74 and Drawing List 87A573 Revision C dated 3-5-74; and installation of Mitchell Radio Coupler Model 1C388-3 according to Bulletin No. 611, Revision 2 dated 8-22-74 and Master Drawing List No. 87A708 Revision B dated 8-22-74.

Also approved for Beech Model RC45J when modified per Beech Dwg. 404-001100, and Beech Models 3N, 3NM, and 3TM when modified per Beech Dwg. 18-5011; also all models on this STC except Beech Models JRB-6, DISC, and RC45J, when modified in accordance with Hamilton Aircraft Company, Inc. STC SA572WE.

The following FAA Approved Airplane Flight Manual Supplements are required;

1. Dated January 13, 1967, for Beech Models JRB-6, D18C, D18S, E18S, E18S-9700, G18S, H18, C45G, C45H, TC45G, TC-45H, and TC-45j(SNB-5).

2. Dated September 29, 1971, for Beech Models JRB-6, DISC, D18S, E18S, E18S-9700, G18S, HIS, C45G, TC45G, TC-45H, TC-45J(SNB-5), also for Model RC45J when modified per Beech Dwg. 404-001100, Models 3N, 3NM, and 3TM when modified per Beech Dwg, 18-5011.

3. Dated August 31, 1973, for Beech Models which have been modified by Hamilton STC SA572WE to 10,100 Ibs. gross, weight; TC45J(SNB-5) , D18S, E18S, C45G, TC45H, TC45G, C45H, E18S-9700, G18S and HIS; also for Models 3N, 3NM, and 3TM when modified per Beech Dwg. 18-5011.

4. Supplement P/N 68S167 dated 4-16-74 for operation of Autopilot Radio Coupler Model 1C388-3.

FAA FORM siio.2-1 (10-69) Tku ctrtificatt may bi tnmsftntd in accordant* with FAR 21.47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and £IP code) from (Name of grantor) (Print or type).

(Address of grantor) (Nuniher and street) ( Citr. Slate, and ^IP code I Extent of Authority (if licensing agreement):

Signature of grantor (hi ink):

## Every issue (1)

- June 25, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/37/e7/37e794675cdd43349bc6ee6d02d693eb542f8ad580c6e1a309e2891dc77ad53c)

---
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.