# STC SA4-22

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Misevic Albert J, United States
- Description: Hartzell HC12X20-8D, B8428-6 propeller assembly.
- Status date: January 1, 1961
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 776](https://openairdocs.org/tcds/776)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FDB304E9F4671021862570D6005255E6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-22

## ADs that name it (0)

None.

## Approved models (1)

- Pirtle J. C. Johnson Rocket 185 ([TCDS 776](https://openairdocs.org/tcds/776))

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