# STC SA09018AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-596.
- Applied: August 18, 1995
- Status date: February 2, 2001
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A24](https://openairdocs.org/tcds/3A24)
- Certificate PDF: https://openairdocs.org/files/sha256/be/db/bedbaa41b94389d7cf362e981e477fd1eb321108da8fb5b775ab41a849f30896
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1BA00ACB1FEC017285256CC1007F39A6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09018AC-D

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company A185F ([TCDS 3A24](https://openairdocs.org/tcds/3A24))

## 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: SA09018AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 I art 3 of the Civil dis Regulutions.

Original Product Type Certificate Number: 3A24 Make: Cessna Model: A185F Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-596, according to Bulletin No. 696, Revision 3, dated 2-02-01 and Master Drawing List No. 92801, Revision C, dated 2-02-01 or later FAA Approved revisions of the above data (28 Volt System).

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

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of Application: 8-18-95 Date Reissued:

Late of isaance: 8-25-95 Date Amended: 4-19-99, 2-02-01 By dinction of the s1 dministrator FEDERAL AVIATION mile K (Signature) TOMINSTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09018AC-D Limitations and Conditions: (con't.)

Also eligible on Cessna model A185F (landplane, floatplane or amphibian) when equipped with STC SA1441 WE (Robertson STOL) or STC SA968CE (Horton STOL) and/or STC SA2529WE (internal tip tanks).

2. FAA/DAS Approved Supplemental Flight Manual, P/N 891191, dated 8-25-95 is required for Cessna Model A185F, S/N 18503683 and Below, Landplane, Floatplane or Amphibian, And The Above Model When Modified Per STC SA2529WE (Internal Tip Tanks) And/Or STC SA1441 WE (Robertson STOL) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891192, dated 8-25-95 is required for Cessna Model A185F, S/N 18503684 and On, Landplane, Floatplane or Amphibian, And The Above Model When Modified Per STC SA2529WE (Internal Tip Tanks) And/Or STC SA1441WE (Robertson STOL) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Supplemental Flight Manual, P/N 891191, Revision 1, dated 4-19-99 is required for Cessna model A185F, S/N 18503683 and below (landplane, floatplane or amphibian) and the above model when equipped with STC SA1441WE (Robertson STOL) or STC SA968CE (Horton STOL) and/or STC SA2529WE (internal tip tanks) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891192, Revision 1, dated 4-19-99 is required for Cessna model A185F, S/N 18503684 and on (landplane, floatplane or amphibian) and the above model when equipped with STC SA1441WE (Robertson STOL) or STC SA968CE (Horton STOL) and/or STC SA2529WE (internal tip tanks) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Supplemental Flight Manual, P/N 891191, Revision 2, dated 2-02-01 is required for Cessna model A185F, S/N 18503683 and below (landplane, floatplane or amphibian) and the above model when equipped with STC SA1441WE (Robertson STOL) or STC SA968CE (Horton STOL) and/or STC SA2529WE (internal tip tanks) for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891192, Revision 2, dated 2-02-01 is required for Cessna model A185F, S/N 18503684 and on (landplane, floatplane or amphibian) and the above model when equipped with STC SA1441WE (Robertson STOL) or STC SA968CE (Horton STOL) and/or STC SA2529WE (internal tip tanks) for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

8_ Compatibility of this modification with other previously approved modifications must be determined by the installer.

FAA Form 8110-2-1 (10-69) Page 2 of 2

## Every issue (1)

- February 2, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/be/db/bedbaa41b94389d7cf362e981e477fd1eb321108da8fb5b775ab41a849f30896)

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