The individual business-aircraft engines that take the trophies for most reliable and best supported are the Honeywell HTF7000-series turbofans and the Honeywell TPE331 turboprop, according to AIN’s readers in our 2013 Product Support Survey. But the engine manufacturers the readers chose for providing the best support overall are Williams for turbofans and Honeywell for turboprops.

Williams (turbofans) and Honeywell (turboprops/turboshafts) were also the only engine manufacturers to score more this year than they did last year; all the others either tied their last-year numbers or fell short.

As usual, we asked readers to single out specific people for providing exemplary product support, and we asked the manufacturers to shed light on what they have done in the past 12 months to beef up the product support they provide to their customers.