Learjet 25 - Flight Characteristics

Flight Characteristics

Taxi operations are accomplished using the electronic nose wheel steering. The steering system on aircraft without variable authority nose wheel steering requires the pilot to select master or primary steering mode. In master mode, 10 degrees of steering is possible. This mode is suitable for straight taxi, takeoff and gentle turns. Primary steering mode allows up to 45 degrees angle of turn and is suitable for slow speed aggressive steering maneuvers. On aircraft equipped with variable authority steering, the steering authority varies with ground speed. The CJ610-6 engines fitted to the Learjet 25 have very low inertia and accelerate rapidly. The time required to accelerate from idle to 100% RPM is approximately four seconds. This excellent throttle response enables rapid acceleration and precise power settings. Single engine performance is good with the single engine rate of climb approximately 1700 feet per minute at gross weight at sea level and a single engine service ceiling of approximately 21500 feet.

The spoilers provide an effective means of increasing normal rates of descent and may be used as a drag device to achieve rapid airspeed deceleration.

The best glide distance with engines windmilling is obtained with a clean airplane configuration and with a glide speed of 160 to 170 knots. At this speed, the Learjet 25 glides approximately 26 nautical miles for each 10000 feet of altitude loss. This is a glide ration of 16 to 1 and is based on a wings level glide with gear and flap up and a gross weight of 11000 to 12000 pounds.

The Learjet 25 is a challenging aircraft to fly in comparison with most general aviation aircraft and more modern light jets. Pilot workload is high and approach, landing and takeoff speeds are above average for civilian aircraft. The Learjet 25 also requires long runways at high altitude or ambient temperature. At 6000 feet elevation, 50 degrees Fahrenheit and with an average load of 5 passengers, the Learjet 25B will require approximately 8000 feet of runway.