# STC ST425CH

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Canard Aerospace Corporation, United States
- Description: Installation of three Trimble TNL8100 GPS navigation systems and three Sperry/Honeywell Attitude Hearing Sensing Units.
- Applied: June 16, 1995
- Status date: May 19, 2004
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4176ED591FD42C3D86256F34005A5044.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST425CH

## ADs that name it (0)

None.

## Approved models (8)

- The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-100B SUD Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-100B Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200B Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200C Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200F Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-300 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747SP Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

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