# STC SA801SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Continental Motors, Inc., United States
- Description: Replacement of the Continental Motors, Inc. Model GTSIO-520-F with the Model GTSIO-520-K engines
- Applied: July 26, 1974
- Status date: November 6, 2013
- Product: Aircraft, Small Airplane
- Certification basis: Part 3, Part 21, Part 33
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/43/30/43305d1bdf7c01613649c880f1a8174d544ee8674806bda0886eadb8ce01192e
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3AA71274F12CD17986257C2900530587.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA801SO

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft LLC 685 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

Number SA801SO This certificate issued to

Part * of the Civil Air Regulations.

*CAR 3 dated May 15, 1956, including paragraphs 3.197, 3.270, 3.395, and 3.396 of amendment 3-2, dated August 12, 1957, amendment 33-3, dated May 17, 1958, 3-4 dated October 6, 1958, 3-6 dated September 13, 1961 Original Product Type – Certificate Number:

Description of Type Design Change: Replacement of the Continental Motors, Inc. Model GTSIO-520-F with the Model GTSIO-520-K engines. No change in power or installation requirements.

Limitations and Conditions: This modification is limited to airplane Serial Number 12018 only. Airplane Flight Manual Supplement dated August 19, 1974, is required with this installation.

Continental Motors, Inc.

2039 South Broad St.

Mobile, AL 36615 2A4 Make: Rockwell International Corporation Model: 685 Date reissued: November 6, 2013

(Signature) Melvin D. Taylor

Manager, Atlanta Aircraft Certification Office

(Title)

Date of application: July 26, 1974

Date of issuance: August 19, 1974

INSTRUCTIONS: Thc transfer endorsement below may be used to notify the appropriate FAA Regional Office of the transfer of this Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transferee and forward it to him.

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 ZIP code)

Signature of grantor (In ink):

Continental Motors, Inc.

2039 South Broad St.

Mobile, AL 36615

**FAA APPROVED**

**AIRPLANE FLIGHT MANUAL SUPPLEMENT**

**ROCKWELL INTERNATIONAL MODEL 685**

Reg. No. N15TC

Ser. No. 12018

This Supplement must be attached to the FAA Approved Airplane Flight Manual dated September 1, 1971, when continental Motors, Inc. Model GTISO-520-K engines are installed in accordance with Supplemental Type Certificate SA801SO, dated August 19, 1974. The information contain herein supplements the information of the basic Airplane Flight Manual;

for the limitations, procedures and performance information not contained in this supplement, consult the basic Airplane Flight Manual.

I. LIMITATIONS: Engine: Two Continental GTISO-520-K

II. PROCEDURES: No change

III. Performance: No change

FAA APPROVED: Original John F. Vogel Chief Engineering And Manufacturing Branch Southern Region, FAA

DATE: August 19, 1974

Continental Motors, Inc. Rockwell International Corp. Model 685, SN-12018 2039 South Broad St. CMI GTSIO-520-K Engines Mobile, AL 36615

**LOG OF REVISIONS**

Rev. No. Description Pages Revised Date 1 Company name change Page 1 Manager, 11/05/2013 (Continental Motors, Inc.) Atlanta ACO

FAA Approved: Page 2 of 3

## Every issue (1)

- November 6, 2013: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/43/30/43305d1bdf7c01613649c880f1a8174d544ee8674806bda0886eadb8ce01192e)

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