# STC SA685WE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Pacific Southwest Airlines, United States
- Description: Aural warning signal when Vmo/Mmo is exceeded.
- 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/86C5DB7E7D955B42862570D20057D78A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA685WE

## ADs that name it (0)

None.

## Approved models (2)

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

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