# STC SA4-783

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: McKenzie Flying Service Inc, United States
- Description: Lycoming 150 hp O-340-A1A engine and Hartzell HC82XG-2B/8433-12 propellers.
- Status date: April 8, 1991
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1A10](https://openairdocs.org/tcds/1A10)
- Certificate PDF: https://openairdocs.org/files/sha256/ac/7e/ac7ee4ad174f311fac9ab2f301b8b6094c140b706217639b956dd6c22aac2005
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/690EFC75A363B3CF85256CC2000C5F80.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4-783

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-23 ([TCDS 1A10](https://openairdocs.org/tcds/1A10))

## 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: SA4-783 This certificate issued to: McKenzie Flying Service, Inc.

Part 3* of the iVil Air Regulations. *CAR 3 including Amendments 3-1 through 3-9 inclusive.

Original Product - Type bertificate Number: 1A10 Make: Piper Model: PA -23 Description of Type Design Change: Installation of Lycoming 0-340-A1A engines anc Hartzell HC82XG-2B/8433-12 propellers (engines limited to 150 h.p.) in accordance with McKenzie Aircraft Repair Installation Instructions and Parts List dated April 3, 1959, and McKenzie Aircraft Repair Drawing Nos. 2-00 and 2-01, or later FAA approved revisions.

Limitations and Conditions: Approval of this change in type design applies basically to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications 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. A copy of this Certificate and FAA Approved Flight Manual Supplement dated April 3, 1959, must be This triped an the up thing rant to has for the mad in main fel until sur rendered, suspended, veroked, or a termination date is otherwise established by the Adreinis trater of the Federal Aviation Administration .

Date of Application: April 3, 1959 Jule reissued: March 27, 1968; September 27, 1989 April 8, 1991 Date of Issuance: April 3, 1959 Sale unended: October 15, 1982 FEDERAL AVIATION By direction of the SIdeyinistraten Дама 92ки TO MINISTRATION Seattle Aircraft Certification Office Manager, Aircraft Modification Branch (Title)

## Every issue (1)

- April 8, 1991: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ac/7e/ac7ee4ad174f311fac9ab2f301b8b6094c140b706217639b956dd6c22aac2005)

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