# STC SA955NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S Duke Teitzel, United States
- Description: Installation of a Continental E-225-4 engine using updraft cooling with a Hartzell HC-12X20-5/8433-O propeller
- Applied: March 31, 1980
- Status date: June 27, 1980
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-782](https://openairdocs.org/tcds/A-782)
- Certificate PDF: https://openairdocs.org/files/sha256/11/25/1125abd87917a70e77b2e791257a2ad0265427a14734275c93d5c971a843f63a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83AFE5DF5F8436F686257A3F005879EA.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA955NW

## ADs that name it (0)

None.

## Approved models (1)

- Sierra Hotel Aero Inc. Navion (Army L-17A) ([TCDS A-782](https://openairdocs.org/tcds/A-782))

## 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: SA955NW This certificate issued to: S. Duke Teitze] Part 3 of the CiViI Air Regulations.

Original Product -Type Certificate Number: A-782 Model: Navion Make: Navion Rangemaster Aircraft Corp. (North American updraft cooling with a Hartzell HC-12X20-5/8433-0 propeller in accordance with Description of Type Design Change: Installation of a Continental E-225-4 engine using photographs 1 through 3.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Navion Rangemaster Aircraft Corp. Navion, Serial Number NAV-4-362 records for the modified aircraft. A copy of this Certificate shall be maintained as part of the permanent

Date of Application: March 31, 1980 Date Reissued:

Date of Issuance: June 27, 1980 Date Amended:

EDERAL AVIATION Charles C tehroeder diction of the Adm (Signature ) *MINISTRATOR Chief, Engineering and Manufacturing Branch (Title)

47.

## Every issue (1)

- June 27, 1980: Issued, Current. [certificate](https://openairdocs.org/files/sha256/11/25/1125abd87917a70e77b2e791257a2ad0265427a14734275c93d5c971a843f63a)

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