# STC SA273WE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Harms Industries, United States
- Description: Vacuum system 121A.
- Status date: January 1, 1960
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A23](https://openairdocs.org/tcds/3A23)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D1597A36AFB350C6862570C9005E38C2.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA273WE

## ADs that name it (0)

None.

## Approved models (1)

- Maule Aerospace Technology Inc. Bee Dee M-4 ([TCDS 3A23](https://openairdocs.org/tcds/3A23))

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