FAA · Supplemental Type Certificate
STC ST00021SE
B737-300/400/500: Installation of HUD Guidance System (HGS), Model 2300, 'partial provisions only'. B737-600/-700/-700IGW/-800: Installation of HUD Guidance System (HGS) Model 2350, 'partial provisions only'. B737-600/-700/-700IGW/-800/-900: Installation of HUD Guidance System (HGS) Model 4000, 'partial provisions only'.
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 (7)
Certification basis — 14 CFR
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗