# STC SA2687SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Quiet Technology Venture, Ltd, United States
- Description: Installation of Hush Kits.
- Status date: January 23, 1990
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A28](https://openairdocs.org/tcds/4A28)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EBE9D0392F9A564685256CC20008C756.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2687SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 720B ([TCDS 4A28](https://openairdocs.org/tcds/4A28))

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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.