STC SA7171SW-D

Supplemental type certificate · S-TEC Corporation

Holder
S-TEC Corporation · United States
Status
Current · Amended
Status date
September 29, 1992
Applied
January 29, 1988
Product
Aircraft · Small Multi-Engine
Certification basis
Part 21
Data sheet
TCDS3A25

From FAA DRS, with our copy of the certificate PDF. DRS record last changed December 5, 2025.

What it approves

Installation of S-TEC system 60 two axis automatic flight guidance system, Model ST-429, with optional automatic electric trim system.

What the certificate saysOCR

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

Haied Sats of Aanica Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 5A717154-0 This certificate issued to: S-TEC Corporation 946 Pegram Wolters Industrial Park Mineral Wells, Texas 76067 Pert 3 si the CiVil Air Rogustations Original Product Typo Contificato Numbon: 3A25 Model: 335, 340, and 340А Description of Type Design Change:

Installation of S-TEC System 60 Two Axis Automatic Flight Guidance System, Model ST-429, with Optional Automatic Electric Trim System, according to Bulletin No. 529, Revision 3, dated 8-24-92 and Master Drawing List No. 92466, Revision C, dated 8-24-92 and/or later FAA Approved revisions of the above data (28 Volt System).

1. Also eligible on Models 340 and 340A When Modified Per STC SE4327SW (RAM Engine Conversion).

(See Continuation Sheet, Page 2, a part of this STC.)

2-05-88 Date Amended: 9-29-92, Revision 1 AVIATIO By Direction of the Administrator Wiin Thann William J. Thomas DAS Staff Coordinator, DAS 5 SW (Tille)

17.

18110-2(10-661

Hamicza Stares of Smenra Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA71715W-D, Revision 1 Limitations and Conditions: (con't.)

2. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89772, dated 2-05-88 is required for Cessna Models 335, 340, and 340A and/or later FAA Approved revisions of the above supplement.

3. FAA Approved Supplement to Pilot's Operating Handbook and/or FAA Approved Airplane Flight Manual, P/N 89772-1, dated 8-29-92 is required for Cessna Models 335, 340, and 340A and 340 and 340A When Modified Per STC SE4327SW (RAM Engine Conversion) and/or later FAA Approved revisions of the above

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

FAA FORM 0110-2-1 (10-00) This certificate may be transferred in accordance with FilM :1.17.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and Z1P code) Exent of Authority (if licensing agreement) :

Signature of grantor (1n ink) :

Page of 2

ADs that name this STC · 0

An AD can apply because an STC is installed, or mention one in its text.

No AD in this release names this STC

Approved models · 3

MakeModelData sheet
The Cessna Aircraft Company3353A25
The Cessna Aircraft Company3403A25
The Cessna Aircraft Company340A3A25