# STC SA3991SW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Raytheon Aircraft Company, United States
- Description: Installation of single SFENA H341AGM standby attitude instrument.
- Status date: March 20, 1986
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A21EA](https://openairdocs.org/tcds/A21EA)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9BA41C136302FBE585256CC2000C5C58.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3991SW

## ADs that name it (0)

None.

## Approved models (2)

- Bombardier Inc. CL-600-1A11 (CL-600) ([TCDS A21EA](https://openairdocs.org/tcds/A21EA))
- Bombardier Inc. CL-600-2A12 (CL-601) ([TCDS A21EA](https://openairdocs.org/tcds/A21EA))

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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.