# STC SA3251NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: AvComp LLC, United States
- Description: Installation of Speed Ring engine cowling.
- Applied: March 27, 1986
- Status date: November 8, 2025
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS A-743](https://openairdocs.org/tcds/A-743)
- Certificate PDF: https://openairdocs.org/files/sha256/3b/03/3b03aee4a379866db2736649d3b70d95bc9dd2021ea3f03fdf1ceae3787ca1cf
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID121590479320260416141746.0001
- DRS record last changed: April 16, 2026
- Page: https://openairdocs.org/stc/SA3251NM

## ADs that name it (0)

None.

## Approved models (10)

- Boeing Airplane Company Wichita Division 75 (Army PT-13) ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division A75 Series ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division A75L3 ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division A75N1 Series ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division B75 (Navy N2S-5) ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division B75N1 (Navy N2S-3) ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division D75N1 (Army PT-27) ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division E75 Series ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division E75N1 ([TCDS A-743](https://openairdocs.org/tcds/A-743))
- Boeing Airplane Company Wichita Division IB75A ([TCDS A-743](https://openairdocs.org/tcds/A-743))

## 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.

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

## Every issue (2)

- November 8, 2025: Issued, Current. [certificate](https://openairdocs.org/files/sha256/3b/03/3b03aee4a379866db2736649d3b70d95bc9dd2021ea3f03fdf1ceae3787ca1cf)
- May 9, 1986: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/e6/d3/e6d32dc5bb360a6efb76e3b7cc74adf2425359a2efb1aa1e8a17f521d378683d)

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