increased fuel capacity including saddle tanks in the rear of the aircraft; new undercarriage for a higher takeoff and landing weight; structural improvements to wings and tail; and a new Rockwell Collins ProLine 4 avionics system. CL-604 MMA (Multi-Mission Aircraft), militarized version, developed by Field Aviation, in Danish service. The aircraft are employed on maritime patrol and search and rescue missions. They are capable of landing on the short, rough, gravel airstrips common in the Arctic. C-143A A single Challenger 604 aircraft was acquired by the United States Coast Guard in December 2005 as its new medium-range command-and-control aircraft. Built from 1996 through 2006, over 360 were delivered; early ones were selling for $4.0–$4.5 million and late models for less than $8 million in 2016. With operating empty weights, it carries six or seven passengers and full fuel with the increased MTOW, is able to cruise 7.5–8.0 hr at Mach 0.80 and to fly five passengers 4,000 nm at Mach 0.74 up to FL 410. Thrust lapse as altitude increases, hefty power, and wing loadings affects hot-and-high performance; it takes off in for under missions, in at MTOW and sea level, but in at ISA+20C and altitudes, TOW is reduced to to meet climb requirements. Pro Line 4 avionics include six cathode ray tubes and dual Flight management systems. It burns in the first hour, in the second hour, in the third hour then /hr. Scheduled maintenance is done every 200 h or six months, and major inspections are made every 96 months, and includes $110,000 landing-gear overhauls, the CF34-3B turbofans cost $375 per engine per hour. CL-605 Following a first flight on January 22, 2006, the Challenger 605 was certified and introduced in early 2006. Compared to the Challenger 604, the airframe was updated with larger cabin windows and a new tail cone, and the flight deck was updated with the Collins Pro Line 21 avionics and "electronic flight bag" capability. The 200th Challenger 605 entered service in October 2012. CL-605 MSA A maritime patrol aircraft design under development by Boeing. Boeing has proposed a repackaging of some of the Boeing P-8 Poseidon sensors but not weapons into a less expensive airframe, the Bombardier Challenger 605 business jet. This aircraft is named Maritime Surveillance Aircraft (MSA) and has been depicted with the AN/APY-10 radar, an electro-optical sensor in a retractable turret, and a magnetic anomaly detector. On February 28,