What it approves
Installation of Speed Ring engine cowling.
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.
SA3251NM AvComp, LLC 15721 Pinehurst Drive, Unit 115 Basehor, KS 66007 Part 4a CAR A-743 Boeing A75L3, 75 (Army PT-13), A75 (Army PT-13A, -13B, -13C), B75 (Navy N2S-5), E75 (Army PT-13D, Navy N2S-5,PT-13D/N2S-5), A75, A75N1 (Army PT-17, -17A;Navy N2S-1, -4), B75N1 (Navy N2S-3), D75N1 (Army PT-27), IB75A, E75N1 This installation is eligible only on those models equipped with a FAA approved Pratt & Whitney R985 series engine installation. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated, unless it is determined by the installer that interrelationship between this change and any of those other previously approved modifications will introduce on adverse affect 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.
03/27/1986 11/08/2025 05/09/1986 for Manager, West Certification Branch 2 Installation of Speed Ring Engine Cowling in accordance with FAA sealed Serv-Aero Installation Instructions Number SAIP-030486, Revision NC, dated March 4, 1986 or later FAA approved revision. Parts Manufactured in accordance with FAA sealed Serv-Aero Drawing 17007, Revision NC, dated February 27, 1985, or later FAA approved revision.
SA3251NM 11/08/2025 2
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 10
| Make | Model | Data sheet |
|---|---|---|
| Boeing Airplane Company Wichita Division | 75 (Army PT-13) | A-743 |
| Boeing Airplane Company Wichita Division | A75 Series | A-743 |
| Boeing Airplane Company Wichita Division | A75L3 | A-743 |
| Boeing Airplane Company Wichita Division | A75N1 Series | A-743 |
| Boeing Airplane Company Wichita Division | B75 (Navy N2S-5) | A-743 |
| Boeing Airplane Company Wichita Division | B75N1 (Navy N2S-3) | A-743 |
| Boeing Airplane Company Wichita Division | D75N1 (Army PT-27) | A-743 |
| Boeing Airplane Company Wichita Division | E75 Series | A-743 |
| Boeing Airplane Company Wichita Division | E75N1 | A-743 |
| Boeing Airplane Company Wichita Division | IB75A | A-743 |
Every issue · 2
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| November 8, 2025 | Issued, current | Certificate |
| May 9, 1986 | Issued, earlier issue | Certificate |