# STC SA921NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Dale J Blomquist, United States
- Description: Installation of a Lycoming O-320-B2A engine, a Sensenich 74DM-O-56 propeller, and 8:50 x 6:00 tires with 2-puck Cleveland brakes
- Applied: January 30, 1980
- Status date: April 29, 1980
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-780](https://openairdocs.org/tcds/A-780)
- Certificate PDF: https://openairdocs.org/files/sha256/ec/6e/ec6ebb52151ca599d1ef2859da12488148d3abfd855f442e41779a68164b483f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/66285E771CDCD2D286257A3F005377F5.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA921NW

## ADs that name it (0)

None.

## Approved models (1)

- FS 2003 Corp. PA-12 ([TCDS A-780](https://openairdocs.org/tcds/A-780))

## 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: SA921NW This certificate issued to: Dale J. Blomquist Part 3 of the Civil Air Regulations.

Original Product -TypeCertificate Number: A-780 Make: Piper Model: PA-12 Description of Type Design Change: Installation of a Lycoming 0-320-BZA engine, a Sensenich 74DM6-0-56 propeller, and 8:50 X 6:00 tires with 2-puck Cleveland brakes in accordance with Dale J. Blomquist 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 Piper PA-12, Serial Number 12-1507 only. A copy of this Certificate and Addendum No. SA921NW shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: January 30, 1980 Date Reissued:

Date of Issuance: . April 29, 1980 Date Amended:

FEDERAL AVIATION Charles Eithveder (Signature ) TAMIN STRATOS Chief, Engineering and Manufacturing Branch (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) April 29, 1980 Number: SA921NW Supplemental Type Certificate ADDENDUM NO. SA921NW The conditions and limitations of Type Certificate Data Sheet Number A-780 apply except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of STC SA921NW, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations.

Supplemental Type Certificate HOLDER: Dale J. Blomquist I. PIPER PA-12 (LANDPLANE-NORMAL CATEGORY) AS MODIFIED BY STC SA921NW Engine: Lycoming 0-320-B2A Engine Limits: 160 Hp at 2700 rpm Fuel: 80/87 octane aviation gasoline Propeller and Propeller Limits: Sensenich 74DM6-0-56 165 Hp @ 2800 rpm Diameter 74"; Pitch 56" Wheels and Brakes: Cleveland 2-puck brakes with 8:50 X 6:00 wheels *All else is the same as Type Certificate Data Sheet A-780.

- END -

**FAA FORM 8110-2-1 (10-69) PAGE3 OF 3 PAGES C FAA AC 73-2651**

## Every issue (1)

- April 29, 1980: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ec/6e/ec6ebb52151ca599d1ef2859da12488148d3abfd855f442e41779a68164b483f)

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