# STC SA4-474

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Vanaero Company, United States
- Description: Collins AP101 automatic pilot system.
- Applied: March 4, 1958
- Status date: August 6, 2007
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS L-3-4](https://openairdocs.org/tcds/L-3-4)
- Certificate PDF: https://openairdocs.org/files/sha256/14/9c/149c84e2e48a0f0ba7cd1833e27f44da2ff5b78d9fc35b78d273a489d2603f96
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E6AF0ED3E7BC76A86257356005CFC1F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-474

## ADs that name it (0)

None.

## Approved models (2)

- Douglas Aircraft Co. Inc. Army A-26B ([TCDS L-3-4](https://openairdocs.org/tcds/L-3-4))
- Douglas Aircraft Co. Inc. Army A-26C ([TCDS L-3-4](https://openairdocs.org/tcds/L-3-4))

## 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.

This certificate reissued to replace certificate reported lost.

This Certificate issued to MIKE KEITHLEY MAILING ADDRESS c/o MGK AERO INC. P. O. BOX 221957 d/b/a VANAERO COMPANY NEWHALL, CA 91322-1957 25620 RYE CANYON ROAD BLDG. A VALENCIA, CALIFORNIA 91355 Part 4b & 9 of the Civil Air Regulations.

Douglas

A26B or C Description of Type Design Change : Installation of Collins AP101 Auto-pilot sy stem per On Mark Engineering Company Summary Drawing Number 269045 dated March 25, 1958.

Limitations and Conditions : Automatic pilot disconnect button m ust be installed on left side of pilot’s wheel and right side of co-pilot’s wheel. Airplane C.G. lim its 24% to 30% , gear retracted. Approved Servo Forces applied to servo cables by servo drum s are: Rudder 46 lbs. ± 1 lb.; Aileron 40 lbs. ± 1 lb.;

Elevator 32 lbs. ± 1 lb. Altitude loss in level flight due to auto-pilot malfunction: 500 feet. Altitude loss during automatic approach due to auto-pilot malfunction: 200 feet.

This approval should not be extended to other specific aircraft of this model on which other previously approved m odifications are incorporated, unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. 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 : March 4, 1958

Date of issuance : May 1, 1958

Date reissued : May 1, 1970; August 6, 2007

( Signature) Manager, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office ( Title)

## Every issue (1)

- August 6, 2007: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/14/9c/149c84e2e48a0f0ba7cd1833e27f44da2ff5b78d9fc35b78d273a489d2603f96)

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