# STC SA4-171

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Garside's Aircraft & Engine Parts & Svc Inc, United States
- Description: Approval to use 1,350 hp for takeoff with Wright R1820-56A, -66 and -72A engines and 1,300 hp, with Wright R-1820-56 and -72 engines with Hamilton Standard33D50/6511-12 and -12S propellers.
- Status date: February 1, 1984
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-723](https://openairdocs.org/tcds/A-723)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/883E70B3FD3CEC6385256CC2000C5DF1.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-171

## ADs that name it (0)

None.

## Approved models (1)

- Lockheed Aircraft Corporation Lockheed 18 ([TCDS A-723](https://openairdocs.org/tcds/A-723))

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