# STC SA3212SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model AK687 consisting of a Piper altimatic X autopilot or Model AK687FD consisting of a Piper altimatic X flight director autopilot with optional remote annunciator.
- Applied: April 27, 1977
- Status date: December 7, 1983
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A8EA](https://openairdocs.org/tcds/A8EA)
- Certificate PDF: https://openairdocs.org/files/sha256/74/a1/74a1215cb8d7fc5b8fd5ce06d4dda98ca750e88fbf75e6508bbdaa07807b60b0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C657929CFACD6A8985256CC2000A9554.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3212SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-31P-350 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))

## 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: SA32125W-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airvorthiness requivements of Part 3 of the CIVi.I. AIr Regulations.

Original Product -Iype bertificate Number: ABEA Make: Piper Model: PA-31-350 Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK687 consisting of a Piper Altimatic X Autopilot or Model AK687FD consisting of a Piper Altimatic X Flight Director Autopilot with Optional Remote Annunciator according to Bulletin No. 816, Revision 1, dated 10-25-77 and Master Drawing List No. 87A926, Revision A, dated 10-25-77 (28 Volt System) and/or later FAA approved revisions.

Limitations and Conditions: E1181ble on Piper Mode1 PA-31-350, S/N 31-7752001 and Up.

FAA/DAS Approved Pilot's Operating Handbook Supplenent, P/N 685547, dated 5-26%77, revised 11-9-77, is required for Piper Models PA-31-350, S/N 31-7752001 and Up and/or later FAA approved revisions.

A Placard stating, "Conduct trim check prior to flight (see POH)" is required.

Compatibility of this modification with other previously approved modifications This bipes and the supering taste With is the basis for appr val shall remain in effet unlil sur vendered, suspended, revoked, on a lermination date is wherwise es lablished by the Adminis tral. r of the Federal Aviation Administration .

Date of Application: 4-27-77 Jule wissued: 11-9-77; 4-26-78; 12-7-83 Revision 3 Date of Issuance: 5-26-77 Sale umended:

FEDERAL AVIATION Don P. Watson (Signature ) TOMINISTRA Manager, Aircraft Certification Division Southwest Region (Title)

47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number - to (Name of transferee).

(Address of transferee) (220185 pro sequen") from (Name of grantor) (Print or type) (Address of grantor) (Number and sireel ;

(City, Stake, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

+11< r. 0~: 1090-862-000

## Every issue (1)

- December 7, 1983: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/74/a1/74a1215cb8d7fc5b8fd5ce06d4dda98ca750e88fbf75e6508bbdaa07807b60b0)

---
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.