# STC SA812NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: American Avionics Inc, United States
- Description: Modification consists of moving the mounting of the roll-servo from fuselage station 71.0 to 180.5 and moving the mounting of the pitch servo from station 85.40 to station 233
- Applied: June 15, 1979
- Status date: July 25, 1979
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 6A1](https://openairdocs.org/tcds/6A1)
- Certificate PDF: https://openairdocs.org/files/sha256/ae/25/ae257563a006c01fed7ea846076bc56299cc4624ed4ab9b50cca689f52781cd8
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B734C6DCEF3429C586257A3E006A0D82.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA812NW

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft LLC 500-B ([TCDS 6A1](https://openairdocs.org/tcds/6A1))

## 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: SA812NW This certificate issued to: American Avionics, Inc.

Part 3 of the CiviI Air Regulalions, effective May 15, 1956, including amendments 3-3 and 3-4.

Original Product - Type Certificate Number: 6A1 Make: Rockwell Commander Model: 500-B Lescriplion / Type Lesiynthange: Modification consists of moving the mounting of the roll-servo from fuselage station 71.0 to 180.5 and moving the mounting of the pitch servo from station 85.40 to station 233. in accordance with American Avionics, Inc., photographs 1, 2, and 3.

NOTE: Servo mounting locations were changed to accomodate a camera hatch installation.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Rockwell Commander 500-B, Serial Number 1484-174 only. This approval is intended for installation in the above model with the Mitchell Automatic Flight Control System Model AK600 in accordance with Mitchell Industries, Inc., STC SA3142SW-D. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft.

Interfapplications June 15, 1979 Date Reissued:

Aule of issuance: July 25, 1979 Date Amended:

FEDERAL AVIATION Chario A Sihroeda (Signature) TOMINIS TRAITOR Chief, Engineering and Manufacturing Branch (Title)

FAA FoR B110-2 (10-68)

## Every issue (1)

- July 25, 1979: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ae/25/ae257563a006c01fed7ea846076bc56299cc4624ed4ab9b50cca689f52781cd8)

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