# STC SA3451SW-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Century Automatic flight system Model AK956, consisting of a Century 2110/2130/2131/2150/2151 autopilot.
- Applied: March 20, 1987
- Status date: January 22, 1997
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A21](https://openairdocs.org/tcds/3A21)
- Certificate PDF: https://openairdocs.org/files/sha256/20/94/20944e773352e72d0325b1fcfbfa90abb40d5f3a3805c49a3c57e6e604828eaa
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3E2B3DF2F0BBC22E85256CC2000A9835.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3451SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company P210N ([TCDS 3A21](https://openairdocs.org/tcds/3A21))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA3451SW.D This certificate issued to: Century Flight Systems, Inc.

3003 FM 1195 P.O. Box 610 Mineral Wells, TX 76067 Part 3 of the Civil Air Regulations Original Product Type Certificate Number: 3A21 Make: CESSNA Model: P210N Description of Type Design Change: Installation of Century Automatic Flight System Model AK956, consisting of a Century 2110/2130/2131/2150/2151 Autopilot per Bulletin No. 2012, dated 11-26-86 Revision 2 dated 01-08-97 and Master Drawing List No. 87A1166, dated 11-26-86 Revision B dated 01-08-97 (28 Volt System) and/or later FAA/DAS Approved Revision.

Limitations and Conditions: FAA/DAS Approved Flight Manual Supplement PIN 685993, dated 03-11-87 Revision 1 dated 01-15-97. Also Century 2000 Autopilot Operator's Manual P/N 68S1035, dated 07-15-86 Revision dated 07-19-94 and/or later FAA/DAS Approved Revision.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

Sabon (Signature) TAMINSTRATO William R. Watson DAS Staff Coordinator DAS 7 SW (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number .

to (Name of transferee).

(Address of transferee) (239175 prco sequens") from (Name of grantor) (Print or type) (Address of grantor) (Number and sireel ;

Signature of grantor (In ink): - + 11= r. 0~. 1090-262-180

## Every issue (1)

- January 22, 1997: Amended, Current. [certificate](https://openairdocs.org/files/sha256/20/94/20944e773352e72d0325b1fcfbfa90abb40d5f3a3805c49a3c57e6e604828eaa)

---
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.