# STC SA09019AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55 two axis automatic flight guidance system with optional autotrim system, Model ST-580.
- Applied: August 15, 1995
- Status date: August 20, 2001
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-782](https://openairdocs.org/tcds/A-782)
- Certificate PDF: https://openairdocs.org/files/sha256/7d/1a/7d1ae97fd6fec89b5b568f80e9da6b67daf05e1f923d7468e68531a59b726b95
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E68B5F8DFE0007E85256CC1007F39A8.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09019AC-D

## ADs that name it (0)

None.

## Approved models (7)

- Sierra Hotel Aero Inc. Navion A (Army L-17B and L-17C) ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion B ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion D ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion E ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion F ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion G ([TCDS A-782](https://openairdocs.org/tcds/A-782))
- Sierra Hotel Aero Inc. Navion H ([TCDS A-782](https://openairdocs.org/tcds/A-782))

## 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 5A09019AC-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 Civid In Regulations.

Original Product Type Cortificate A unter: A-782 Make: Navion Model: A, B, D, E, F, G, and H Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-580, according to Bulletin No. 680, Revision 2, dated 8-15-01 and Master Drawing List No. 92777, Revision B, dated 8-15-01 or later FAA Approved revisions of the above data (14 Volt System).

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.

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

Date of Application: 8-15-95 Date visued:

Lute of ismance: 8-18-95 Date Amended: 10-16-95, 8-20-01 By Direction of the Administrator FEDERAL AVIATION ти к (Signature) Michael Keirnan TOMINSTRATO DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA09019AC-D Limitations and Conditions: (con't.)

1. Also eligible on Navion models A, B, D, E, F, G, and H when modified by Palo Alto Airport, Inc. or Symon's Engineering horizontal stabilizer angle of incidence change with or without tip tanks and the above models when modified by 285 H.P. engine conversion.

FAA/DAS Approved Supplemental Flight Manual, P/N 891193, dated 8-18-95 is required for Navion Models A, B, D, E, and F When Modified Per STC SA4-241 (Stabilizer Modification) and STC SA4-915 (Tip Tanks) And The Above Models When Modified By 285 H.P. Engine Conversion or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891210, dated 10-16-95 is required for Navion Models G and H or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Supplemental Flight Manual, P/N 891193, Revision 1, dated 8-20-01 is required for Navion models A, B, D, E, and F when modified by Palo Alto Airport, Inc. or Symon's Engineering horizontal stabilizer angle of incidence change with or without tip tanks and the above models when modified by 285H.P. engine conversion or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891210, Revision 1, dated 8-20-01 is required for Navion models G and H when modified by Palo Alto Airport, Inc. or Symon's Engineering horizontal stabilizer angle of incidence change with or without tip tanks and the above models when modified by 285H.P. engine conversion or later FAA Approved revisions of the above supplement.

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)

- August 20, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/7d/1a/7d1ae97fd6fec89b5b568f80e9da6b67daf05e1f923d7468e68531a59b726b95)

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