# STC ST449SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Avitas Engineering
- Description: Installation of air data computer with altitude display, altitude reporting, and altitude alerting capabilities.
- Status date: June 5, 1992
- Data sheets: 4A25, 4A25
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/73C553DB904FE2ED85256CC300036025.0001
- Page: https://openairdocs.org/stc/ST449SO

## ADs that name it

None.

## Approved models (2)

- McDonnell Douglas Corporation DC-8-21 (TCDS 4A25)
- McDonnell Douglas Corporation DC-8-51 (TCDS 4A25)

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From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.