# STC SH593NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Columbia Helicopters Inc, United States
- Description: Installation of in-flight blade monitoring system.
- Status date: April 27, 1978
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H8WE](https://openairdocs.org/tcds/H8WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/62012F9C7F30EF6885256CC200622141.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH593NW

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company Vertol (Army) CH-21C ([TCDS H8WE](https://openairdocs.org/tcds/H8WE))

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