Avionics
Retrofit altimeter chosen for Challenger
Bombardier has selected Revue Thommen’s AD20 two-inch electronic standby altimeter as a retrofit option for the Challenger 601-3A/3R and 604.

Bombardier has selected Revue Thommen’s AD20 two-inch electronic standby altimeter as a retrofit option for the Challenger 601-3A/3R and 604. According to the Swiss avionics specialist, the AD20 is the first electronic standby altimeter designed to RTCA DO-178B standards with software level A required for installation on Part 25-certified jets.

The new altimeter promises operators enhanced features that are not available with mechanical standby instruments, as well as improved reliability. It provides both a dedicated digital liquid crystal display and an analog pointer, and features high-intensity backlighting for daylight conditions.