# STC SA4743NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aero Air Inc, United States
- Description: Installation of two Hartzell HC-B3TN-3B/T10178B-10Q propellers on airplanes equipped with P&W PT6A-135 engines.
- Applied: February 28, 1989
- Status date: July 21, 1989
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A8EA](https://openairdocs.org/tcds/A8EA)
- Certificate PDF: https://openairdocs.org/files/sha256/92/a2/92a2c65129f778e1fc5ad833d4fb2fed3b58ceb34784cf4319c6d33f58856191
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8632DAFFE079DBE785256CC2000E3E55.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4743NM

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-31T2 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SAA7431M This certificate issued to:

Aero Air, Inc.

Certifies that the change in the type design for the following product with the linitations and conditions therefor as specified heronmeels the airsonthiness reguirements of Purt 3 of the CiVil Air Regulations Original Product -Type Certificate Number: A8EA Make:

Model: Piper PA-31T2 Description of Type Design Change: Installation of two Hartzell HC-B3TN-3B/T10178B-100 propellers on Piper Model PA-31T2 airplanes equipped with Pratt & Whitney of Canada Ltd. PT6A-135 engines in accordance with an FAA approved copy of Aero Air, Installation instructions No. AA32, pages 1 through 6, dated April 12, 1989, or later FAA approved revision.

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 aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft.

(See Continuation Sheet No. SA4743NM)

Date of Application: February 28, 1989 Sate issued:

Date of Issuance: July 21, 1989 I ate unended:

FEDERAL ANITATION By Direction of the Administrator Starst Khillen TOMINISTRATO Assistant Manager, Aircraft Certification Office ( Signature Seattle (Title)

47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SAA743NM Limitations and Conditions: (continued) Airplanes equipped with this modification must be operated in accordance with FAA Approved Pilot's Operating Handbook Supplement, dated July 21, 1989, or later FAA approved revision. A copy of this Certificate, Continuation Sheet and FAA Approved Pilot's Operating Handbook must be maintained as part of the permanent records for the modified aircraft.

This propeller modification results in no acoustical change from the originally approved airplane configuration.

No determination has been made by the FAA that the noise levels of this airplane are or should be acceptable or unacceptable for operation at, into, or out of, any airport.

- END -

**FAA FORM 8110-2-1 (10-69)**

**PAGE OF PAGES**

## Every issue (1)

- July 21, 1989: Issued, Current. [certificate](https://openairdocs.org/files/sha256/92/a2/92a2c65129f778e1fc5ad833d4fb2fed3b58ceb34784cf4319c6d33f58856191)

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