The brake system utilizes hydraulic pressure for power boost. Unlike a car, a plane's burn rate is dependent upon a number of factors, including: A plane will burn more fuel during take-off and its initial ascent.
Most Learjet 25 aircraft were fitted with a fuselage tank. Any Learjet 25s that have not been modified by installing Stage 3 noise compliant engines or have not had "hushkits" installed for non-compliant engines will not be permitted to fly in the contiguous 48 states after December 31, 2015. The landing gear, brake, flap and spoiler systems are hydraulically operated. It is a stretched version of the Learjet 24. The brake valves are controlled via the rudder pedal toe brakes through mechanical linkages. The amount of bleed air cooling at the heat exchanger can be controlled by the hot air bypass valve (H-valve).
Dial markings are based on percent of maximum allowable engine speed. The Learjet 25 is an American ten-seat (two crew and eight passengers), twin-engine, high-speed business jet aircraft manufactured by Learjet.
A drag chute is fitted as optional equipment on some Learjet 25 aircraft. , Two General Electric CJ610-6 single-rotor axial-flow turbojet engines are pylon-mounted on each side of the aft fuselage. Conventional wing flaps are used to improve low speed flying characteristics and reduce landing and take-off speeds.
The use of oxygen is only required for emergency in case of depressurization of the cabin or contamination of the cabin air.
is a key factor in any flight plan. The Learjet 25 is similar to the Model 24 but is 1.27 m (4 ft 2 in) longer, allowing for three additional passengers. For more information on this aircraft, please visit our website at the link. The vanes provide regulated voltage input to the angle-of-attack transducers, modified by a stall warning bias box to compensate for flap position. Many Learjet 25 aircraft remain in regular use today, particularly in the United States, Mexico, and Canada.
The drag chute has been deployed in a crosswind of up to 20 knots under actual test conditions.
Engine bleed air is admitted through a flow control valve to a heat exchanger.
Each engine is rated at 2950 pounds of thrust at sea level.
Some aircraft have a 1000 VA auxiliary inverter that is used as an option for added system capacity. Mr Z, what was your cruise speed at 30K?
The Model 25C also has an optional two bed sleeping compartment.
A plane will burn more fuel during take-off and its initial ascent. When the aircraft speed is 7% above stall, the stall warning energizes a control column shaker that produces a low-frequency buffet signal through the control column to warn the crew. Used 261.8 Gallons for the flight. Interconnecting cables synchronize the flaps throughout their range of travel and a limit switch located on the left flap sector prevents over-travel. Flapper-type check valves, located in the various wing ribs, allow free fuel flow inboard but restrict outboard flow. Instead, one must do some digging to find various estimates. The inboard doors are hydraulically operated while the outboard doors are mechanically operated by linkage connected to the main gear struts. With a cruising speed of approximately Mach 0.76, passengers reach their destination in good time. Passengers or owners, on the other hand, tend to think in terms of gallons since this is how fuel is priced. The Learjet 25 is listed explicitly in Federal Register 78 FR 39576. Even then we've seen different people calculate the average differently - there are just so many variables. An audible waning horn warns of flap extension to more than 25 degrees if the landing gear is not down and locked.
The engine compartments consist of an eight-stage axial-flow compressor directly coupled to a two-stage turbine, a through-flow annular combustion system, variable inlet guide vanes, controlled compressor interstage bleed, exhaust nozzle and accessory drive system. 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. When buying a car, the fuel efficiency is easily determined and stated in the vehicle specifications. Once cruising altitude and speed are reached, the fuel burn drops off. The report then shows lower fuel usage for the subsequent hours. The pointer responds to the dynamic pressure from the pitot heads on the nose compartment. The Learjet 25 cabin is pressurized to enable high altitude operations without the use of supplemental oxygen.
In 1974 the Peruvian Air Force purchased two 25Bs with a belly pod that contained an aerial survey camera. Over pressurization is prevented by a pressure relief valve which opens at 1700 psi. The first Model 25 flew on August 12, 1966, and the first delivery was in November 1967.
Primary flight control is achieved by use of dual control wheels and rudder pedals. Emergency extension can be accomplished pneumatically in case of hydraulic or electrical system failure.
The cabin pressure is provided by the conditioned air entering the cabin through the distribution ducts and controlled by modulating the amount of air exhausted from the cabin. If you buy a jet card membership, some of the cards fully include the cost of fuel in the price.
A tank cross-flow valve is installed to prevent fuel transfer between wing tanks. The cabin temperature is controlled by regulating the temperature of the pressure bleed air that is routed through the cabin. In order to minimize heat build-up in the brakes and reduce brake wear, pilots are advised to deploy the spoilers upon touchdown. Airspeed indication is provided by a single pointer, dual scale airspeed/ mach meter. The stall warning system utilizes a stall warning vane on each side of the nose. An oxygen rupture disc will relieve oxygen pressure if the oxygen cylinder pressure reaches 2700 to 3000 psi.
Passengers are also influenced by car performance, again measured in gallons.
The two flight crew are then supplemented by either a doctor or flight nurse or both. If you plan to buy a plane, you should know that fuel will be the biggest variable cost. And yet, the fuel costs can be 50% or more of the annual operating costs, running from hundreds of thousands of dollars a year for a light jet, to millions of dollars a year for heavy jets. As the wheel rotation speed accelerates to normal tolerance limits, normal braking pressure is restored. Each wing tank extends from the centre bulkhead outboard to the wing tip and provides separate fuel for each engine. The brake system incorporates four power-boosted disc-type brakes with integral anti-skid system.
This excellent throttle response enables rapid acceleration and precise power settings. This mode is suitable for straight taxi, takeoff and gentle turns. Monobromotrifluoromethane (CF3BR) is used as extinguishing agent.
One of the world's largest, fastest, best selling and well known series of business jets, the Learjet family began with the original six to eight seat Lear Jet 23 which first flew on October 7 1963.
AC current is provided by two 1000 Volt-Amperes (VA) solid-state inverters. Two disc-type indicators are flush mounted under the left engine.
Both pilots died.
By 2018, 1970s Learjet 25s were sold for under $200,000. I was wondering if I'm the only one who pushes the speed envelope?
The Lear 45XR began production in June of 2004 and continued until 2013 with a … Table showing approximate fuel burn range by class of aircraft: Table showing approximate fuel burn by specific aircraft model: As you can see, fuel efficiency figures vary greatly, and for good reason. A jet pump installed in each tip tank transfers fuel into the wing tanks.
Speed and altitude of flight. The electrically operated RPM tachometer consists of a signal generator on the engine and an indicator located in the centre of the instrument panel. Despite being used at lower altitudes and equipped with small landing gear, the Learjet can land on gravel runways if it is fitted with a special "gravel kit". When chartering a plane, the fuel cost is typically included in the overall price quote. When the angle-of-attack transducer vanes decrease below the stall point, the nose down command is removed. Climb-out and descent were both at 1,200fpm. 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.
The nose wheel has a specially moulded tire to prevent water splashing into the engines. I just completed the flight KDEN to KLAS 1/2 tanks, a total of 448.1 Gallons.