# STC SE10947SC

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Prime Turbines, United States
- Description: The conversion of the Pratt & Whitney Canada, Model PT6A-21 to a PT6A-28 turboprop engine
- Applied: March 28, 2008
- Status date: November 1, 2021
- Product: Engine
- Certification basis: Part 33
- Data sheets: [TCDS E4EA](https://openairdocs.org/tcds/E4EA)
- Certificate PDF: https://openairdocs.org/files/sha256/c5/cd/c5cd11eddc0f01ebdd7bbbbb1ce6f54e3b4cffbda675807e7272bb7bd3c82c7f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID143664958820250730153712.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE10947SC

## ADs that name it (0)

None.

## Approved models (2)

- Pratt & Whitney Canada Inc. PT6A-21 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA))
- Pratt & Whitney Canada Inc. PT6A-28 ([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.

SE10947SC Prime Turbines 1615 Diplomat Drive Ste. 120 Carrollton, TX 75006 Part 33 the Federal Aviation Regulations E4EA Pratt & Whitney Canada PT6A-21, -28 The conversion of the Pratt & Whitney Canada, Model PT6A-21 to a PT6A-28 turboprop engine in accordance with "Killick Aerospace USA LLC, d/b/a Prime Turbines PT6A-21 to PT6A-28 Conversion" Revision A, dated July 7, 2009, or later FAA approved revision. The installation of second engine data plate, Prime Turbines, Drawing No. STC SE10947SC, "Data Plate", Rev. B, dated July 1, 2009, is also required.

(See continuation sheet 3 of 3) March 28, 2008 September 1, 2009; October 20, 2021; November 1, 2021 July 16, 2009 Jim Grigg Manager, Fort Worth ACO Branch, Compliance & Airworthiness Division Aircraft Certification Service 3

SE10947SC 3

SE10947SC Date of Issuance: July 16, 2009 Date of Reissuance: November 1, 2021

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 Killick Aerospace USA LLC, d/b/a Prime Turbines, "Instructions for Continued Airworthiness Manual", Revision B, dated July 7, 2009, is required. The engine parts used for the modification will be inspected and found to be airworthy in accordance with the Pratt & Whitney Canada, Overhaul Manual for the Model PT6A-21 and PT6A-28 engines.

-END- 3 3

## Every issue (3)

- November 1, 2021: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c5/cd/c5cd11eddc0f01ebdd7bbbbb1ce6f54e3b4cffbda675807e7272bb7bd3c82c7f)
- September 1, 2009: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/28/e0/28e08e315801ba8272c0e9bd5dadd36a9462314f10702101dc3408461ce334b2)
- July 16, 2009: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/b3/92/b392afeaf70c896e091a246909a4ab1f0e9bcfde645b88e78f319515a6b1cf20)

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.