# STC SA8954SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: John Wentzell Downs Jr.
- Description: Installation of Hartzell HC-B3TN-3Z/ T10282N(K)+4 or HC-B3TN-3Z/ T10282N+4 propeller.
- Status date: December 17, 2025
- Data sheets: A37CE, A37CE
- Certificate PDF: https://openairdocs.org/files/sha256/45/c9/45c94183600d24d5f4512f6c761080e2435e59d39fed2f8ce1316397c0f1e5c0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167519544720260123161418.0001
- Page: https://openairdocs.org/stc/SA8954SW

## ADs that name it

None.

## Approved models (2)

- Textron Aviation Inc. 208 (TCDS A37CE)
- Textron Aviation Inc. 208B (TCDS A37CE)

## 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.

SA8954SW John Wentzell Downs, Jr.

1507 Airport Lane Mountain View, AR 72560 Part 23 the Title 14, Code of Federal Regulations A37CE Textron Aviation Inc. (Cessna Aircraft Co.)

208; and 208B Propeller diameter limits are 106 to 105 inches. Flight Manual Supplement dated November 16, 1996, or later FAA approved revision is required. This STC is limited to Cessna Model 208 or 208B airplanes with only Pratt & Whitney Canada PT6A-114 or PT6A-114A engines installed.

(See Continuation Sheet 3 of 3) 03/01/1994 01/22/2015 03/27/2015 06/30/2015 09/01/1994 11/04/1994 02/09/1997 11/18/2015 ✔ for Paul Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3 Installation of Hartzell HC-B3TN-3Z/T10282N(K)+4 or HC-B3TN-3Z/T10282N+4 propeller in accordance with John Downs, Inc. Maintenance Manual Supplement, dated October 31, 1996, or later FAA approved revision.

FAA 8110-2 ( 10/24) Page 2 of __

SA8954SW 12/17/2025 3

SA8954SW 12/17/2025 Date Reissued:

12/17/2025

Limitations and Conditions (Continued);

Maximum engine horsepower is 675 HP for this STC. 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 a product, the holder must give the other person written evidence of that permission.

-END- 3 3

## Every issue (3)

- December 17, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/45/c9/45c94183600d24d5f4512f6c761080e2435e59d39fed2f8ce1316397c0f1e5c0)
- November 18, 2015: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/eb/73/eb73aa18a7326f3b20f912ed883854fcb16fa486a81c7eabbadf1c1e983bb4b2)
- June 30, 2015: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/28/57/28576fe560ac45dbdbc38620bb7f94c4335045054d55c26c8c3fc88dd3b2c81f)

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