# STC SA3135SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell Automatic Flight System Model AK597 consisting of Century II B
Autopilot with Optional Radio Coupler
- Applied: April 15, 1976
- Status date: June 5, 1984
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 1A15](https://openairdocs.org/tcds/1A15)
- Certificate PDF: https://openairdocs.org/files/sha256/8c/3a/8c3ad5ff08bd8b3d13592374f6e87439be95b918c34534f26cdf9b9b41a5ddaa
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3DE68E27E12350B485256CC2000A944F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3135SW-D

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-24-400 ([TCDS 1A15](https://openairdocs.org/tcds/1A15))

## What the certificate says

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

Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA313554-D This certificate issued to: Century Flight Systems, Inc.

F.M. 1195 P. O. Box 610 Mineral Wells, IX 76067 Certifies that the change in the type design for the following product with the limitations and conditions thorefon as specified hereon meets the airvorthiness reguirements of Port 3 of the CIVII Air Regulations.

Original Product -Iype berlificate Number: 1A15 Make: Piper Model: PA-24-400 Description of Type Design Change:

Installation of Mitchell Automatic Flight System Model AK597 consisting of Century II B Autopilot with Optional Radio Coupler according to Bulletin No. 721, dated 4-14-76 and Master Drawing List No. 87A854, dated 4-14-76.

FAA/DAS Approved Airplane Flight Manual Supplement, P/N 685369, dated 5-10-76 is required.

Date of Application: 4-15-76 Juke missued: 6-05-84, Revision 1 Date of Issuance: . 5-10-76 Jale unvended:

FEDERA AUTATION By Direction of the Administrator OMINISTRY TION Manager, Aircraft Certification Division Don P. Watson Southwest Region "(Siğnature) (Title) 47 FAA FOR 8110-2 (10-68)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) (279185 peso sequens" ) from (Name of grantor) (Print or type) (Address of grantor) (Number and sireel ;

Date of Transter:

Signature of grantor (In ink):

+ 11 = r. 0 n. 1090-262-080

## Every issue (1)

- June 5, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8c/3a/8c3ad5ff08bd8b3d13592374f6e87439be95b918c34534f26cdf9b9b41a5ddaa)

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