Denver-based JetTech received STC approval to install Garmin G600 avionics with dual flat-panel displays in the Piper Cheyenne III, IIIA and 400LS. The upgrade includes dual G600 RVSM primary instrumentation, with RVSM-capable air data computers. Touchscreen Garmin GTN 650 and 750 navcoms are also available as an additional installation. The company will begin initial installations at its Denver facilities, followed by kits available through JetTech-approved Garmin authorized dealers.