FAA · Supplemental Type Certificate
STC ST01523WI
Model Westwind Astra 1125 (S/N -004 thru -041)Installation of Universal Avionics EFI-890R Flat Panel EFIS System with Optional Vision 1 Synthetic Vision 1 System, Optional Universal Avionics Application Server Unit, Optional WSI AV300/350 Weather Data Link System, and Thommen AC-32 Air Data Computer
What is an STC?
A Supplemental Type Certificate authorizes a major modification or alteration to an FAA-certificated aircraft. STCs are how operators legally install new avionics, change fuel systems, add floats, swap engines, etc. — every change beyond a minor modification needs one.
Applicable aircraft (1)
Specific sections
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗