The venerable TPE331 (né 1965) now manufactured by Honeywell is for the first time to power the also venerable Cessna Caravan (né 1984), as Alaska's Aero Twin has secured a Supplemental Type Certificate for retrofits using the TPE331-12JR version of the powerplant. The 800-shp ­12 retrofit will make for a takeoff distance nearly 11% shorter than the existing Caravan 208B's, a 60% better rate of climb, improved payload range, lower fuel burn for the same mission profile, lower operating cost, longer inspection intervals, and improved anti-ice engine performance, Honeywell says.