# STC SA594WE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Western Airlines Inc, United States
- Description: Audible mach airspeed warning system.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A22](https://openairdocs.org/tcds/4A22)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BD80F2242AE185FA862570D1006F5885.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA594WE

## ADs that name it (0)

None.

## Approved models (1)

- Lockheed Aircraft Corporation 188A ([TCDS 4A22](https://openairdocs.org/tcds/4A22))

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