Two Honeywell TFE731-20-AR turbofan engines are pylon-mounted at the rear of the fuselage and provide a takeoff thrust of 3,500 lbs. for the Learjet 45.
The Learjet 45 has an overall fuselage length of 57.6 feet with a wingspan of 47.8 feet. The wing area is 311.6 square feet with an overall height from level ground to the top of the tail of 14.13 feet. Internally the aircraft has a cabin length of 19.75 feet, measured from the cockpit divider to the pressurized compartment bulkhead. The cabin has a maximum width at the horizontal centerline of the fuselage tube of 5.12 feet and a width of 3.1 feet at the floor line. The total height of the cabin is 4.92 feet.
The maximum allowable weight on the ramp is 20,750 lbs. while the maximum takeoff weight is 20,500 lbs. This allows for 250 lbs. of fuel consumption while performing run-up and ground maneuvering. The maximum landing weight of the aircraft is 19,200 lbs. and the maximum zero fuel weight, or the total allowable weight of the aircraft without any fuel, is 16,000 lbs. The maximum allowable weight of fuel is 6,062 lbs. The aircraft's maximum payload is 2,305 lbs. Maximum payload with full fuel is 993 lbs. and the maximum fuel weight with full payload is 4,750 lbs.
The Lear 45 with full fuel capacity, while maintaining regulation fuel reserves, has a maximum range of 2,102 nautical miles based on four passengers and two crew. The aircraft is capable of a high-speed cruise of mach 0.81, or 464 mph, although the typical cruise speed will be mach 0.79, or 457 mph, and the long-range cruise speed is mach 0.75, or 430 mph. On a flat dry runway at sea level at maximum gross take-off weight, the aircraft requires a ground roll of 4,350 feet. The distance required to land at maximum landing weight is 2,660 feet. The Learjet 45 has a maximum operating ceiling altitude of 51,000 feet. At maximum gross takeoff weight, the aircraft can climb to 43,000 feet in 23 minutes and 6 seconds.
Because of variations in available options and applications from one plane to another in this model line, performance specifications and weights may differ slightly.
