# STC SA1275NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Bob or Barbara Williams, United States
- Description: Installation of a Hartzell HC-C2YL-1BF/F7663A-4 propeller on a Lycoming O-320-E2A engine
- Applied: June 11, 1981
- Status date: August 31, 1988
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A19](https://openairdocs.org/tcds/3A19)
- Certificate PDF: https://openairdocs.org/files/sha256/18/55/185552df144826002cff83c061c51de7c7819fb70fc432d07485409348ca17c5
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2EC06478A902EF70862580530073FC2D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1275NW

## ADs that name it (0)

None.

## Approved models (1)

- Textron Aviation Inc. 150H ([TCDS 3A19](https://openairdocs.org/tcds/3A19))

## 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: SA1275NH This certificate issued to: Bob and Barbara Wi111ams Part 3 of the CIVIL AIT Pugulations? May 15, 1956, as amended by 3-4.

Original Product - Type bertificate Number: 3A19 Make: Cessna Model: 150H Description of Type Design Change: Insta1lation Of a Hartzell HC-C2YL-1BE/F7663A-4 propeller on a Lycoming 0-320-E2A engine in accordance with Norman L. Peterson photographs 1 and 2.

NOTE: The Lycoming 0-320-E2A is installed on this aircraft in accordance with STC SA572CE. This propeller installation is applicable only to this aircraft with this engine installation.

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 model 150H aircraft, Serial Number 15068333 only. A copy of this Certificate and Continuation Sheet shall be maintained as part of the permanent records for the modified aircraft.

FAA FoR 8110-2 (10-68)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA1275NH Limitations and Conditions: (continued) The conditions and limitations of Type Certificate Data Sheet Number 3A19 apply except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of STC SA1275NW, prescribes the conditions and limitations under which the STC was issued meets the airworthiness requirements of the Civil Air Regulations.

Supplemental Type Certificate HOLDER: Bob and Barbara Williams Cessna 150H 2PCL-SM (Utility Category) as modified by STC SA1275NW NOTE 2: Placards Add this placard in full view of the pilot adjacent to the airspeed indicator:

**MAXIMUM CLIMB SPEED FOR ENGINE COOLING - 90 MPH IAS**

- END -

**FAA FORM 8110-2-1 (10-69) PAGE 3OF 3 PAGES FAA AC 82-03578**

## Every issue (1)

- August 31, 1988: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/18/55/185552df144826002cff83c061c51de7c7819fb70fc432d07485409348ca17c5)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.