# STC SA372NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Harbord, Robert S., United States
- Description: Installation of a Wright R-975-30 engine; a Hamilton Standard 2D30/6167A-15 propeller; a  inch Harrison oil cooler with ducting; and a modified Twin Beech (AT-11) cowl
- Applied: September 4, 1975
- Status date: November 1, 1976
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS TC 603](https://openairdocs.org/tcds/TC%20603)
- Certificate PDF: https://openairdocs.org/files/sha256/08/c8/08c8f081c280e810b1e5a1b3a79b40b921b310d6ad5c6488c83decef7e482154
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04237CA4639B65E186257AE80071BDE4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA372NW

## ADs that name it (0)

None.

## Approved models (1)

- Fairchild Industries Inc. F-45 (Army UC-80) ([TCDS TC 603](https://openairdocs.org/tcds/TC%20603))

## What the certificate says

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

Hanited States of 2lmerica STe Beek Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA372NW This certificate issued to: ROBERT S. HARBORD Certifies that the change in the type design for the filling praduct with the limitations and conditions therefor us speciful heren mets the airerhiness requirements f Purt TA of the AerO BUIletin Regululivns., Effective January 17, 1935.

Original Product -Type Bertificates Aumter: 603 Make: Fairchild Model: F-45 Jescriplin/ Type Fei»Shange: Installation of a Wright R-975-30 engine;

a Hamilton Standard 2D30/6167A-15 propeller; a 7 inch Harrison oil cooler with ducting; and a modified Twin Beech (AT-11) cowl in accordance with Robert S. Harbord photographs 1 through 28.

fimillions andbendils: Data pertaining to this modification are considered inadequate for duplication on other aircraft. This approval is limited to the installation in Fairchild Model F-45, Serial Number 4014 only. A copy of this Certificate and Addendum Number SA372NW shall be maintained as part of the permanent records for the modified aircraft.

Tales/ applation: September 4, 1975 Date Reissued:

Date of Issuance: November 1, 1976 Date Amended:

EDERAL AVIATION by direction of the MISTRATIOD Chief, Engineering and Manufacturing Branch ¡ itte tie SA372NW The conditions and limitations of Type Certificate Data Sheet Number 603 apply except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of STC SA372NW prescribes the conditions under which the product for which the STC was issued meets the airworthiness requirements of the Federal Aviation Regulations.

Supplemental Type Certificate Holder: Robert S. Harbord I. FAIRCHILD F-45 (LANDPLANE - NORMAL CATEGORY) AS MODIFIED BY STC SA372NW Engine: Wright R-975-30 Fuel: 80 octane minimum grade aviation gasoline Engine Limits: Takeoff - 450 HP at 2250 rpm & 36.5" HG - 5 min. Maximum continuous - 420 HP 2200 rpm & 34.8" HG @ sea level Propeller: Hamilton Standard 2D30/6267A-15 Propeller Limits: 550 HP at 2400 maximum continous Serial Number Eligible: 4014 only Airspeed Limits: Same as specified in Data Sheet # 603 Maximum Weight: 4000 pounas Powerplant Instrument Markings:

NOISE CERTIFICATION PROCEDURE:

Compliance with FAR 36, Appendix F, was shown with the following procedures: Level flyover at 1000 AGL at 2200 engine rpm full throttle manifold pressure. The certificated noise level is data to a standard 70 dB(1) credit resulting from aircraft takeoff and climb characteristics. Maximum allowable: 82 dB(A).

**FAA FORM 8110-2-1 (10-69) PAGE 3 OF 3 PAGES C FAA AC 73-2651**

## Every issue (1)

- November 1, 1976: Issued, Current. [certificate](https://openairdocs.org/files/sha256/08/c8/08c8f081c280e810b1e5a1b3a79b40b921b310d6ad5c6488c83decef7e482154)

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