# STC SA423NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Stewart E Westcott, United States
- Description: Conversion of a Lycoming O-320-E2C (150 HP @ 2700 rpm) to a O-320-D2A (160 HP @ 2700 rpm) with a Sensenich M74DM-0-58 propeller
- Applied: April 16, 1976
- Status date: April 14, 1977
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A1CE](https://openairdocs.org/tcds/A1CE)
- Certificate PDF: https://openairdocs.org/files/sha256/71/dc/71dcabfdcb0a6a6a96569b6f3f7863adb1d019b51b01ea0f191e214932b75a19
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/42A566CC5887986E86257A47005C1FF8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA423NW

## ADs that name it (0)

None.

## Approved models (1)

- Hawker Beechcraft Corporation A23-19 ([TCDS A1CE](https://openairdocs.org/tcds/A1CE))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- April 14, 1977: Issued, Current. [certificate](https://openairdocs.org/files/sha256/71/dc/71dcabfdcb0a6a6a96569b6f3f7863adb1d019b51b01ea0f191e214932b75a19)

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