# STC SH509NE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: MSI, United States
- Description: Installation of Sperry Model MLZ-910, microwave landing system.
- Status date: July 27, 1989
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H2SW](https://openairdocs.org/tcds/H2SW)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/62D4633CD56342F285256CC2005C32C8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH509NE

## ADs that name it (0)

None.

## Approved models (1)

- Bell Helicopter Textron (Canada) 206L-3 ([TCDS H2SW](https://openairdocs.org/tcds/H2SW))

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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.