Honeywell’s second-generation HTF7000 series engines are more powerful and fuel efficient than the original powerplant that entered service in 2003, plus they have lower emissions. Aboard Longitude, they’re rated at 7,550 lb. thrust for takeoff.

The 16:1 compression ratio high pressure core of the engine has a four-stage axial flow compressor, with two stages of variable incidence stator vanes that help manage air flow, improve acceleration and increase stall margins, plus a single centrifugal flow compressor. Aft of the compressor, there is a low emissions annular combustor that, compared to the original HTF7000, emits 20% of the unburned hydrocarbons as well as reducing carbon monoxide, nitrous oxide and smoke emissions well below CAEP/6 standards.

The high pressure compressor is driven by a two-stage high-pressure turbine aft of the combustor. Exhaust gases then enter a three-stage low-pressure turbine section that powers the wide chord fan at the front of the engine. The modest 4.2:1 bypass ratio and deep fluted exhaust mixer nozzle enhanced high-altitude cruise thrust performance.

The engine uses an air turbine starter, controlled by a dual-channel FADEC and net weight (less accessories) is 1,534 lb. 

This article is a sidebar to "First Look: Cessna Citation Longitude" published in the March 2016 issue of Business & Commercial Aviation.