# STC SH1523GL

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Shadin Company Inc, United States
- Description: Installation of Shadin engine trend monitor system.
- Status date: October 11, 1995
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H4SW](https://openairdocs.org/tcds/H4SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4FDC173BDAD30BC485256CC2005C2E9A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH1523GL

## ADs that name it (0)

None.

## Approved models (3)

- Bell Helicopter Textron 212 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))
- Bell Helicopter Textron 412 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))
- Bell Helicopter Textron 412EP ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.