# STC SA3137SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Automatic Flight Systems Model AK611 consisting of Century IIB Autopilot with Optional Radio Coupler.
- Applied: May 3, 1976
- Status date: June 5, 1984
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 1A10](https://openairdocs.org/tcds/1A10)
- Certificate PDF: https://openairdocs.org/files/sha256/69/fc/69fc8a968bddc7c8a7d07442ee12a4c07c1c07bccecc0afe209a79afa01cf0fe
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B94C430FFD92CA7185256CC2000A9454.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3137SW-D

## ADs that name it (0)

None.

## Approved models (3)

- Piper Aircraft Inc. PA-23-235 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))
- Piper Aircraft Inc. PA-23-250 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))
- Piper Aircraft Inc. PA-E23-250 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))

## 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.

<Jl£a*i4a&f> ^Department or transportation —f ederal aoiation Administration Supplemental 'Cgpe Certificate SA3137SW-D Century Flight Systems, Inc.

F.M. 1195 P. 0. Box 610.

Mineral Wells, TX 76067 1A10 Piper PA-23-235, PA-23-250, PA-E23-250 Installation of Mitchell Automatic Flight Systems Model AK611 consisting of Century IIB Autopilot with Optional Radio Coupler according to Bulletin No. 737, dated 4-30-76 and Master Drawing List No. 87A859, dated 4-30-76.

Eligible on Piper Models PA-23-250 and PA-E23-250, S/N 27-7554181 and below. Also eligible on Piper Models PA-23-235, PA-23-250, S/N 27-7554181 and below, and PA-E23-250, S/N 27-7554181 and below when modified per STC SA909WE.

FAA/DAS Approved Airplane Flight Manual Supplement, P/N 68S376 is required, dated 5-10-76.

Placard, P/N 13A660 is required.

modifications 6-05-84, Revision 1 _/£><£• ap&Attancc- : 5 — 10 — 76 antftuKft-

• S/U'ji Don P. WatSOn (Signature) Manager, Aircraft Certification Division Southwest Region (Title)

**FAA FCMM II10-2 (10-61)**

: The n^ endowment below may be u,ed .o notify the appropriate FAA Region.. Office of ihe tranifer of ihU Supplemental Type Certificate.

The FAA will reinue the certificate in the name of .he tranrferee and forward it .o him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) _ from (Name of grantor) (Print or type).

(Address of grantor) —— Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- June 5, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/69/fc/69fc8a968bddc7c8a7d07442ee12a4c07c1c07bccecc0afe209a79afa01cf0fe)

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