The engine's fan has approximately a 5 to 1 bypass ratio for improved fuel efficiency and low acoustic signature. Another first for Cessna is the inclusion of powered controls in the Citation X. The controls are powered by dual-hydraulic systems for redundancy. There are two elevators and the tailplane is all-moving for trim. The rudder is in two pieces: the lower portion is hydraulically powered and the upper portion is electrically powered. Each wing has five spoiler panels, to be used both for roll control (in addition to the ailerons) and as speed brakes. One of the major challenges of the Citation X design was finding enough space in the wing to run all the necessary hydraulic lines. As Paul Kalberer, the chief engineer of the Citation X program, explained, the Citation X needs just as many hydraulic pumps and actuators as a large airliner, but has much less space inside the wings. Honeywell provides the avionics system for the glass cockpit. The Honeywell Primus 2000 EFIS flight director system is composed of five 7-inch × 8-inch CRT screens. Dual flight management systems with GPS are standard. In Citation X+, avionics was upgraded to Garmin 5000. In 2008, Winglet Technology, with the help of Cessna, began flight testing epoxy/graphite elliptical winglets on a Citation X. Flight testing was nearing completion in late 2008, with FAA supplemental type certification expected in 2009. The winglets increase range by 150 nm, lower fuel burn by 4–5%, improve hot and high performance as well as climb rate, permitting a climb to flight level 430 in 22 minutes, as opposed to 26 minutes without the modification. Climb to flight level 450 at maximum takeoff weight is possible without a step climb. Cruise speed at altitude is expected to increase by 15 knots, and maximum takeoff weight will increase by 1200 lbs (545 kg). Excluding installation, the kit's projected cost is $395,000. Elliptical winglets were made standard on Citation X+. Multiple companies bought it: Waitt Media, Honeywell, Target Corporation, Townsend Engineering, General Motors and Schweitzer Engineering Laboratories since 2002. Private owners included film director Sydney Pollack, attorney Fred Furth, Oracle's Larry Ellison, entrepreneur Steve Fossett, Formula One driver Nelson Piquet, Donald Trump and golfer Arnold Palmer. NetJets ordered 60 then another 21, at the standard 10.5% discount, flying it 1,100 to 1,200 hr. per year, and XOJET, started in 2006, operates 20 jets.