# STC SA4903NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: CheckSix AeroSolutions, LLC, United States
- Description: Installation of Continental TSIO-520-D engine and McCauley 3A32C76-S- M/82NM-2 propeller,derated to 260 hp and 2625 rpm.
- Applied: May 29, 1986
- Status date: July 27, 2023
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/eb/67/eb6759c082a67d392a05cf6ad614e8e38275623237d3295198dc1d1b991e44c4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID120110331820230905161843.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4903NM

## ADs that name it (0)

None.

## Approved models (1)

- Textron Aviation Inc. P35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

## 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.

FAA Form 8110-2 (03/21) Page 1 of 2 SA4903NM CheckSix AeroSolutions, LLC 2132 E Avion St., Suite A Ontario, CA 91761 Part 3 the Civil Air Regulations 3A15 Beech P35 Installation of Continental TSIO-520-D engine and McCauley 3A32C76-S-M/82NB-2 propeller, derated to 260 hp and 2625 rpm, per Aviation Research Systems drawing listed on Drawing List 101-P35-209, dated March 8, 1990, or later FAA approved revision.

Approval of this change in type design applies to above 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 other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate, Continuation Sheet, and FAA Flight Manual Supplement, dated March 8, 1990, or later FAA approved revision, shall be maintained as part of the permanent records for the modified 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.

May 29, 1986 October 23, 2003; April 15, 2022; May 16, 2022; July 27, 2023 October 23, 2003 for Manager, West Certification Branch March 8, 1990

## Every issue (4)

- July 27, 2023: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/eb/67/eb6759c082a67d392a05cf6ad614e8e38275623237d3295198dc1d1b991e44c4)
- May 16, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/e6/8c/e68c60940908bc058364f82b3e8c60f199513e04a811c7f10d5eee7bb540564d)
- April 15, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/12/c1/12c1efe2649318a74b6ffaf7329d8e87d86f9146efbf0e8c9987c98f74debabf)
- October 23, 2003: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/37/e0/37e067b7be41846ffb680aa96a52bf3dae15b270dcc1c8769b2c94ce45674710)

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