What it approves
Control lock, locking rudder, elevator, and ailerons.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.
SA4-1197 AvComp, LLC 15721 Pinehurst Drive, Unit 115 Basehor, KS 66007 Part 4a CAR A-743 Boeing A75 (Army PT-13A, -13B, -13C) Installation of control lock, locking rudder, elevator, and ailerons per Serv-Aero Engineering, Inc., Drawing Number 1072.
1. This approval should not be extended to other specific airplanes 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 airplane.
2. 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.
07/02/1960 11/08/2025 05/27/2026 07/07/1960 for Mr. Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 2
SA4-1197 05/27/2026 2
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 2
Every issue · 3
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| November 8, 2025 | Reissued, current | Certificate |
| November 8, 2025 | Reissued, earlier issue | Certificate |
| July 7, 1960 | Issued, earlier issue | Certificate |