# STC SA423NE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: MSI, United States
- Description: Installation of Bendix Model MLS-20A, microwave landing system.
- Status date: February 23, 1987
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5597EAB0D7E6577C85256CC2000E3ABD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA423NE

## ADs that name it (0)

None.

## Approved models (1)

- Raytheon Aircraft Company F33 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

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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.