# STC SA1-274

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Steve Pierce, United States
- Description: Installation of Lycoming O-320(150 hp) series engine and Sensenich M74DM propeller.
- Applied: April 28, 1958
- Status date: March 12, 2025
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS 1A6](https://openairdocs.org/tcds/1A6)
- Certificate PDF: https://openairdocs.org/files/sha256/20/89/208968d9bbfc6f8def9d2fc11fccebfc1eeacfe32389bf32a829a1d9da5759d3
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID143941891620250407154931.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1-274

## ADs that name it (0)

None.

## Approved models (2)

- The New Piper Aircraft Inc. PA-22 ([TCDS 1A6](https://openairdocs.org/tcds/1A6))
- The New Piper Aircraft Inc. PA-22-135 ([TCDS 1A6](https://openairdocs.org/tcds/1A6))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

SA1-274 Steve Pierce 196 US Hwy 380 East Graham, TX 76450 3 Civil Air Regulations.

1A6 Piper PA-22, PA-22-135

1. Original airspeed and gross weight limits must be maintained for the foregoing aircraft.

2. Airplane Flight Manual Supplement dated November 4, 1958, required with this installation.

(continued on Page 3) 4/28/1958 9/7/1976 3/12/2025 11/4/1958 12/30/1963 for Paul Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division

3 Installation of Lycoming Model 0-320 (150 hp.) series engines and Sensenich Propeller Model M74DM in accordance with J. Arlington Myers Instruction Manual Pages 1 through 5, dated April 28, 1958.

SA1-274 03/12/25 3

SA1-274 03/12/25 Limitations and Conditions (continued):

3. AFMS dated December 30, 1963, required for change in C. G. envelope from original aircraft limits.

4. This approval should not be extended to other specific airplanes of these models on which other previously approved modifications are incorporated unless it is determined that the inter-relationship between this change and any of those other previously approved modifications will introduce no adverse affect upon the airworthiness of that airplane. Compatibility of this modification with other previously approved modifications must be determined by the installer.

5. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

----------------------------------------------------------END---------------------------------------------------- 3 3 Add Page

## Every issue (1)

- March 12, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/20/89/208968d9bbfc6f8def9d2fc11fccebfc1eeacfe32389bf32a829a1d9da5759d3)

---
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.