# STC SA4374NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aero Innovations LLC, United States
- Description: Installation of a pitot-type engine air intake
- Applied: March 29, 1988
- Status date: September 24, 2015
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21, Part 23, Part 27
- Data sheets: [TCDS A4SW](https://openairdocs.org/tcds/A4SW)
- Certificate PDF: https://openairdocs.org/files/sha256/0f/28/0f28a7bdff241a62f90d21e94c0bd22057264627ea7464aecf68f6370309f093
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3FA439345A0015386257ECB0079885C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4374NM

## ADs that name it (0)

None.

## Approved models (3)

- Thrush Aircraft Inc. S2R-T11 ([TCDS A4SW](https://openairdocs.org/tcds/A4SW))
- Thrush Aircraft Inc. S2R-T15 ([TCDS A4SW](https://openairdocs.org/tcds/A4SW))
- Thrush Aircraft Inc. S2R-T34 ([TCDS A4SW](https://openairdocs.org/tcds/A4SW))

## 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(10-68) Page 1 of 3 Number SA4374NM This Certificate issued to AERO INNOVATIONS LLC 7750 EAST SR42 TERRE HAUTE, INDIANA 47803 Part 3 of the Civil Air Regulations Dated May 15, 1956, with Amendments 3-1 thru 3-8. Turbine engine installation I.A.W. Part 23 dated February 1, 1965, with Amendments 23-1 thru 23-16 and SFAR 27 dated January 1, 1975, with Amendment 27-1. (CAR 8 for Type Certificate A4SW).

A4SW

Ayres

S2R-T34, S2R-T15, S2R-T11 Description of Type Design Change : Installation of a pitot-type engine air intake in accordance w ith Installation Manual for Fresh Air Inlet System dated August 18, 1988, and Master Print List No. 062088 dated September 23, 1988.

NOTE: The engines approved are United Aircraft of Canada models PT6A-34AG, PT6A-15AG, or PT6A-11AG.

Limitations and Conditions : Approval of this change in type design applies to the above -model aircraft only.

This approval should not be extended to other specific aircraft of these models on which other modifications are incorporated unless it is first 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 Federal Aviation Administration Flight Manual Supplement dated November 9, 1988, or later FAA approved revisions must 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. (See Continuation Sheet Page 3 of 3)

Date of application: March 29, 1988

Date of issuance: November 9, 1988

Date reissued: December 5, 2011, January 16, 2015 September 24, 2015 Date amended: January 16, 2015

(Signature) Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title)

NOTE:

**DO NOT DELETE THIS PAGE.**

**DO NOT ADD ANY DATA TO THIS PAGE.**

**THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.**

Number SA4374NM

Limitations and Conditions: (continued)

1. Inspect and clean filter every 100 hours, and replace filter at 1500 hours.

2. This pitot-type air intake may only be installed by the STC holder, or by any facility designated by the STC holder to perform the installation.

-END-

## Every issue (3)

- September 24, 2015: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/0f/28/0f28a7bdff241a62f90d21e94c0bd22057264627ea7464aecf68f6370309f093)
- January 16, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/66/cb/66cbd4009eada7a09b521d9b8f22eb543dc9cb72a688948a196a40717aee1719)
- December 5, 2011: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/2e/14/2e140ccf593ef3460ee56fd7809a66bc58abc62c868ce9d5dacf4d94d2f7741e)

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