The main gear is enclosed by two doors after retraction. The cabin temperature is controlled by regulating the temperature of the pressure bleed air that is routed through the cabin. The H-valve position can be adjusted by the crew to increase or reduce the amount of bleed air cooling at the heat exchanger. A parked Learjet 25B. A pressure switch will energize the pump if hydraulic pressure falls below a preset level and de-energize the pump when pressure returns to normal. Two 24 Volt batteries provide standby power for the DC system and are used for engine starting.
A tank cross-flow valve is installed to prevent fuel transfer between wing tanks.
When the tank is full, a float switch de-energizes the wing boost pumps and closes the valve.
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. The Learjet 25 offers an ideal high speed platform for business travel for six to eight passengers. Typischerweise werden jedoch nur 7 Sitze eingebaut. Primary flight control is achieved by use of dual control wheels and rudder pedals.
The time required to accelerate from idle to 100% RPM is approximately four seconds. The H-valve position can be adjusted by the crew to increase or reduce the amount of bleed air cooling at the heat exchanger.A refrigeration-type cooling system is used for cooling and dehumidification while the aircraft is on the ground or operating at altitudes below 18 000 feet.
Dial markings are based on percent of maximum allowable engine speed.
The DC system is powered from two 28 Volt, 400 Amperes, engine-driven starter-generators.
The pressure differential at final cruising altitude will be maintained at 8.7 psi difference between pressure altitude and cabin altitude. This frequency is compared to a normal deceleration curve and if it deviates it activates a small torque motor in the affected wheel control valve which shunts braking pressure to the return line by means of a spool valve. The brake valves are controlled via the rudder pedal toe brakes through mechanical linkages.
The Learjet 25 also requires long runways at high altitude or ambient temperature. When both angle-of-attack transducer vanes increase to 5% above stall, the pitch servo commands an aircraft nose down attitude. The CJ610-6 engines fitted to the Learjet 25 have very low inertia and accelerate rapidly.
In master mode, 10 degrees of steering is possible.
The Learjet 40 is a light business jet produced by Bombardier Learjet. The engine pressure ratio (EPR) system enables the pilot to obtain power required to meet certified aircraft performance without exceeding engine limitations.
The best glide distance with engines windmilling is obtained with a clean airplane configuration and with a glide speed of 160 to 170 knots.
Oxygen is always available for the crew and can be made available to the passengers manually or automatically. Das Flugzeug verfügt über ein 2-Personen-Cockpit und über eine Kabine für bis zu 10 Passagiere, die in der Sitzanordnung 1+1 untergebracht sind. Manufactured by Learjet as a stretched version of the Learjet 24.. Development. The brake valves are controlled via the rudder pedal toe brakes through mechanical linkages.
Hydraulic pressure for retraction and extension of the gear is transmitted by a system of tubing, hoses and actuating cylinders and is electrically controlled by limit switches and solenoid valves. Introduced September 23, 1980.
Received from an old man that passed away. Each wing tank extends from the centre bulkhead outboard to the wing tip and provides separate fuel for each engine. Von der Learjet 25 wurden seit dem Jahr 1966 373 Serienmaschinen gebaut. The tip tanks provide additional fuel capacity to enable longer times aloft. Condition is New as seen. The drag chute is attached to the aircraft with a lanyard system that releases it from the aircraft should an inadvertent deployment be made while airborne. If the red disc is ruptured, either or both the containers have been discharged overboard as a result of an overheat condition causing excessive pressure within the containers.A drag chute is fitted as optional equipment on some Learjet 25 aircraft. The indicator face is divided into green (safe), yellow (caution) and red (danger) segments. A duty cycle of 3 minutes on and a cooling period of 20 minutes off is required to avoid overheating the pump motor.The hydraulically retractable landing gear is of conventional tricycle configuration with air-hydraulic shock-type nose and main gear. 373 aircraft were built.
The nose wheel has a specially moulded tire to prevent water splashing into the engines. The vanes provide regulated voltage input to the angle-of-attack transducers, modified by a stall warning bias box to compensate for flap position. Four additional shuttle valves connect the pneumatic system to the brake system for emergency braking. Description.
The stall warning system utilizes a stall warning vane on each side of the nose. The fuselage tank can be filled by the wing boost pumps through the transfer line and the fuel transfer valve.
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