# STC SA632NW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Seaplane Flying Inc, United States
- Description: Installation of a Continental GO-300-E engine, McCauley 2A31C21/84S-0 propeller, Cessna 175C engine nacelle, engine mount, cowl flaps, and associated systems
- Applied: July 5, 1978
- Status date: July 30, 1979
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/6b/b3/6bb34d72aa9fa1bbf7580ec6c863103790c97f703b4add34345d56f01e373b47
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E2CF712A515D858F86257A4000625F85.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA632NW

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 175 ([TCDS 3A17](https://openairdocs.org/tcds/3A17))

## 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: SA632NW This certificate issued to: Seaplane Flying, InC.

Purt 3 of the CiviI Air Regulations:, dated May 15, 1956.

Original Product -Type Certificate Number: 3A17 Make: Cessna Model: 175 McCauley 2A31C21/84S-0 propeller, Cessna 175C engine nacelle, engine mount, Description of Type Design Change: Installation of a Continental 60-300-E engine, cowl flaps, and associated systems in accordance with Seaplane Flying, Inc.

Installation Instructions No. SF 5000, as amended July 30, 1979.

NOTE: This engine installation is also approved with the McCauley 2A31C21/84S-7 propeller.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Cessna 175, Serial Number 55092 only. A copy of this Certificate, Addendum No. SA632NW, and Installation Instructions SF 5000 shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: JUIY 5, 1978 Date Reissued:

Date of Issuance: . July 13, 1978 Take unended: July 30, 1979 FEDERAL AVIATION harle Cate rasoeder (Signature ) TO RAIO Chief, Engineering and Manufacturing Branch (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Amended July 30, 1979 e Number: SA632NW Supplemental Type Certificate ADDENDUM NO. SA632NW The conditions and limitations of the original specification apply except as follows:

This Addendum, which is part of the Supplemental Type Certificate No. SA632NW, prescribes the conditions and limitations under which the STC was issued and meets the airworthiness requirements of Civil Air Regulation Part 3. A copy of this Addendum shall be maintained as part of the modified aircraft permanent records.

Supplemental Type Certificate HOLDER: Seaplane Flying, Inc.

CESSNA 175, 4PCL-SM (NORMAL CATEGORY) AS MODIFIED BY STC SA632NW Engine: Continental G0-300-E Fuel: 80/87 minimum grade aviation gasoline Engine Limits: For all operations, 3200 rpm (175 Hp) Propeller and McCauley constant speed propeller Propeller Limits: McCauley 2A31C21/84S Diameter: Not Over 84"; Not Under 75" Governor: Garwin Hydraulic 34-827 Spinner: Cessna 0552016 Airspeed Limits (TIAS):

C. G. Range:

Maximum Weight:

Serial Number Eligible:

Same as Data Sheet 3A17 Same as Data Sheet 3A17 2350 pounds (same as Data Sheet 3A17) 55092 only

- END -

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

## Every issue (1)

- July 30, 1979: Amended, Current. [certificate](https://openairdocs.org/files/sha256/6b/b3/6bb34d72aa9fa1bbf7580ec6c863103790c97f703b4add34345d56f01e373b47)

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