# STC SA558CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: National Flight Services, Inc, United States
- Description: Installation of circuit breaker in windshield de-ice low system.
- Status date: October 15, 1996
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/71709F8B6C0C7AC185256CC200122A0E.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA558CH

## ADs that name it (0)

None.

## Approved models (2)

- Twin Commander Aircraft Corporation 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690B ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

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