# STC SA3210SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system Model AK685 consisting of a Piper altimatic X autopilot or Model AK685 FD 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/af/45/af45dbb0ed59443f81edd12cb234f99b12a145988b1761e4be460ef0ca450f77
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5352F875544CE1785256CC2000A954F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3210SW-D

## ADs that name it (0)

None.

## Approved models (6)

- Piper Aircraft Inc. PA-31P ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))
- Piper Aircraft Inc. PA-31P-350 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))
- Piper Aircraft Inc. PA-31T ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))
- Piper Aircraft Inc. PA-31T1 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))
- Piper Aircraft Inc. PA-31T2 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))
- Piper Aircraft Inc. PA-31T3 ([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: SA32105W-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Purt 3 of the CIV1.1 AIr Regulations.

Original Product - Type Cantificate Number: ABEA Make: Piper Model:

PA-31 Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK685 consisting of a Piper Altimatic X Autopilot or Model AK685FD consisting of a Piper Altimatic X Flight Director Autopilot with Optional Remote Annunciator according to Bulletin No. 814, Revision 1, dated 10-25-77 and Master Drawing List No. 87A924, Revision A, dated 10-25-77 (28 Volt System) and/or later FAA Approved Revisions of the above data.

Limitations and Conditions: E1181ble on Piper Mode1 PA-31, S/N 31-7712001 and Up.

FAA/DAS Approved Pilot's Operating Handbook Supplement, P/N 685539, dated 5-26-77, revised 11-9-77, is required for Piper Model PA-31, S/N 31-7712001 and Up and/or later FAA approved revisions of the above supplement.

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

Compatibility of this modification with other previously approved modifications Kes cipedit en the dupering assetech is the basis fur apprenal shull remain in effect until sur rendered, suspended, revoked, or a termination date is otherwise es lablished by the Adrei nis trate n of the Federal Aviation Administration .

Date of Application: . 4-27-77 Sule wissued: 11-9-77; 4-26-78; 12-7-83 Revision 3 Date of Issuance: . Date Amended:

5-26-77

EDERAL AVIATION Don P. Watson (Signature ) POMINISTRANOE Manager, Aircraft Certification Division Southwest Region (Title) 47 FAA FORM 8110-2 (10-68)

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

(Address of transferee) (Number and streel) from (Name of grantor) (Prinl or type) (Address of grantor) (Number and sireel;

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

Signature of grantor (In int):

## Every issue (1)

- December 7, 1983: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/af/45/af45dbb0ed59443f81edd12cb234f99b12a145988b1761e4be460ef0ca450f77)

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