# STC SE11139SC

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Airforce Turbine Service, United States
- Description: The conversion of the Pratt & Whitney Canada, Model PT6A-135 to a PT6A-135A turboprop engine
- Applied: October 10, 2010
- Status date: July 21, 2014
- Product: Engine
- Certification basis: Part 21, Part 33
- Data sheets: [TCDS E4EA](https://openairdocs.org/tcds/E4EA)
- Certificate PDF: https://openairdocs.org/files/sha256/99/28/992889a1b130a7869fd3c52c593de10702c730d4a11e18a3cdaf5c9ce1725a87
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/697CD7F318B2A8E486257D240059F125.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE11139SC

## ADs that name it (0)

None.

## Approved models (1)

- Pratt & Whitney Canada Corp. PT6A-135 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA))

## 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 (8/13) Page 1

Supplemental Type Certificate Project Number ST9455SC-E DJB Number SE11139SC This certificate issued to Airforce Turbine Service 11557 Hwy. 359 Mathis, TX 78368

Part 33 of the Federal Aviation, Regulations.

Original Product – Type Certificate Number: E4EA Make: Pratt & Whitney Canada Model: PT6A-135

The conversion of the Pratt & Whitney Canada, Model PT6A-135 to a PT6A-135A turboprop engine in accordance with Airforce Turbine Service Master Document List Report No. DRG 13-2013, dated August 30, 2013, or later FAA approved version. The installation of second engine data plate Airforce Turbine Service, Drawing No. ATS1002, “Data Plate Install & Inspection”, dated June 11, 2013, is also required.

The installer must determine whether this design change is compatible with previously approved modifications. 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.

The Airforce Turbine Service, “Instructions for Continued Airworthiness Manual”, dated June 11, 2013, or later FAA approved versions is required. The engine parts used for modification will be inspected and found to be airworthy in accordance with the Pratt & Whitney Canada, Overhaul Manual for the Model PT6A-135 and PT6A-135A engines. Conversion of a previously STC converted engine is not authorized.

Date of Application: October 10, 2010 Date Reissued:

Date of Issuance: July 21, 2014 Date Amended:

Signature

S. Frances Cox

Title Manager, Special Certification Office Southwest Region

FAA Form 8110-2 (8/13) Page 2 SUPPLEMENTAL TYPE CERTIFICATE, FAA FORM 8110-2 (CONTINUED)

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## Every issue (1)

- July 21, 2014: Issued, Current. [certificate](https://openairdocs.org/files/sha256/99/28/992889a1b130a7869fd3c52c593de10702c730d4a11e18a3cdaf5c9ce1725a87)

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