The flaps are hydraulically operated. FAA certified on September 4, 1970.

The necessary fuel for the craft and its contents will further increase the weight, and therefore the fuel burn. The fuselage tank can be filled by the wing boost pumps through the transfer line and the fuel transfer valve. This excellent throttle response enables rapid acceleration and precise power settings. In 1970 the Learjet 25B was produced along with the Learjet 25C in the same year. Each wing tank extends from the centre bulkhead outboard to the wing tip and provides separate fuel for each engine. The electrically operated RPM tachometer consists of a signal generator on the engine and an indicator located in the centre of the instrument panel. During ground operations, a solenoid limits the pressure differential to 0.25 psi in order to ensure normal functioning of the door and emergency exit. The airplane had reportedly departed Belém, Brazil without a flight plan and with the transponder turned off. Type development continued with the Models 25D and 25G, which included more advanced CJ610-8A engines and a ceiling increase to 51,000 feet. When aircraft manufacturers quote fuel burn numbers they will nearly always show the assumptions that they make eg 6 occupants @ 200 lb (91 kg) each, Long Range Cruise speed, ISA en-route, NBAA IFR reserves with 100 nm alternate, takeoff @ Sea Level.

Average fuel burn was 670-680pph each engine at .65G cruise. The angle-of-attack transducer supplies a proportional voltage to the angle-of-attack of the aircraft. Fuel can also flow via the flapper check valves into the wing tanks, but the lower half of the fuel in the tip tanks must be transferred with the jet pump.

Phantom Aero Technical – ATTC034, (1998), Johannesburg, This page was last edited on 8 October 2020, at 12:15. The hydraulically retractable landing gear is of conventional tricycle configuration with air-hydraulic shock-type nose and main gear. The aircraft is equipped with AC (Alternating Current) and DC (Direct Current) electrical systems. When averages are stated, it is important to remember that the first hour fuel usage will be significantly higher. The steering system on aircraft without variable authority nose wheel steering requires the pilot to select master or primary steering mode. Passengers or owners, on the other hand, tend to think in terms of gallons since this is how fuel is priced. A plane carrying two passengers with light carry-on bags and two crew will use less fuel than the same craft when loaded with ten passengers and a week's worth of baggage for all of them. During fuel transfer, the fuselage tank transfer pump pumps fuel into the both wing tanks. 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. Landed at KLAS with 186.3 gallons total fuel on board. I just completed the flight KDEN to KLAS 1/2 tanks, a total of 448.1 Gallons. Oxygen is contained in a pressurized bottle located in the dorsal fin of the aircraft. Similarly, the Embraer website offers hourly fuel burn rates for the Phenom 300 as a means of demonstrating typical burn during take-off and ascent, as compared with during subsequent flight time. On April 10, 2014, a privately owned Learjet 25D was destroyed on the ground by Venezuelan forces. The refrigeration system consists of a compressor, receiver dehydrator and evaporative cooler located above the baggage compartment. By 2018, 1970s Learjet 25s were sold for under $200,000.

Even then we've seen different people calculate the average differently - there are just so many variables. The pressure differential at final cruising altitude will be maintained at 8.7 psi difference between pressure altitude and cabin altitude. A tank cross-flow valve is installed to prevent fuel transfer between wing tanks. Prices today are around $3,500,000 with 8 currently advertised for sale. The vanes provide regulated voltage input to the angle-of-attack transducers, modified by a stall warning bias box to compensate for flap position. 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. In 2013, the FAA modified 14 CFR part 91 rules to prohibit the operation of jets weighing 75,000 pounds or less that are not stage 3 noise compliant after December 31, 2015. The heavier the aircraft, the more fuel it will need to fly. The amount of bleed air cooling at the heat exchanger can be controlled by the hot air bypass valve (H-valve). For the chart below we've used a fuel density of 6.7 lb per US gallon (= 0.803 kg/l). The first Model 25 flew on August 12, 1966, and the first delivery was in November 1967.[1]. In master mode, 10 degrees of steering is possible.

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. A fuel control metering system selects the rate of fuel flow to the engine combustor.[3]. 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. Instead, one must do some digging to find various estimates. Other reports average the numbers out. The rudder pedals mechanically operate the rudder for directional yaw control. When the angle-of-attack transducer vanes decrease below the stall point, the nose down command is removed. 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. A pre-charged accumulator dampens and absorbs pressure surges. Used 261.8 Gallons for the flight. As the wheel rotation speed accelerates to normal tolerance limits, normal braking pressure is restored. On aircraft 25-181 and subsequent the variable volume engine driven pump delivers fluid under a pressure of 1450 psi to the system and static pressure is maintained at 1500 to 1550 psi. The brake valves are controlled via the rudder pedal toe brakes through mechanical linkages. When the tank is full, a float switch de-energizes the wing boost pumps and closes the valve. The fuel flow through a rotor-turbine at each engine causes the rotor to spin and a pickup coil emits pulses as the rotor blades pass through the coil field. Fuel costs will account for as much as 70 percent of your variable operational costs.

The Learjet 25 is a challenging aircraft to fly in comparison with most general aviation aircraft and more modern light jets. Four additional shuttle valves connect the pneumatic system to the brake system for emergency braking. In 1974 the Peruvian Air Force purchased two 25Bs with a belly pod that contained an aerial survey camera. Taxi operations are accomplished using the electronic nose wheel steering. The valves are controlled by the FIRE switch and activation of these valves are indicated with pinhead lights located in the cockpit next to the FIRE switch. The indicator face is divided into green (safe), yellow (caution) and red (danger) segments. When buying a car, the fuel efficiency is easily determined and stated in the vehicle specifications. The Learjet 25 cabin is pressurized to enable high altitude operations without the use of supplemental oxygen. There is no standardization within the industry as to how fuel consumption should be stated or measured, and it's a figure that many OEMs do not provide.

The control wheels operate the elevator and ailerons mechanically through a system of cables, pulleys, push-pull tubes and bell cranks.

The large markings are graduated in 2% increments from 0% to 100% and the small dial is graduated in 1% increments from 0% to 10% to allow the pilots to accomplish more precise engine speed settings. For aircraft, it is not so simple. A duty cycle of 3 minutes on and a cooling period of 20 minutes off is required to avoid overheating the pump motor. If you buy a jet card membership, some of the cards fully include the cost of fuel in the price.

As always please feel free to contact us with any comments or questions on this article. This is a glide ratio 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. Fuel flow is indicated via a fuel flow system.

The necessary fuel for the craft and its contents will further increase the weight, and therefore the fuel burn. Improved version. Starting ignition is provided by a dual output capacitor-discharge system. Two motor-driven shutoff valves will stop hydraulic flow to the engine-driven pumps in case of an emergency. is a key factor in any flight plan. If the yellow disc is ruptured, either or both containers have been discharged into the engine nacelle.

The landing gear, brake, flap and spoiler systems are hydraulically operated. For more information on this aircraft, please visit our website at the link. The greater the altitude, the greater the fuel efficiency of a jet engine. 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. It is possible for gravel from an improperly packed gravel runway to be sucked into the engines causing "foreign object damage", thus the need for the kit.

An oxygen rupture disc will relieve oxygen pressure if the oxygen cylinder pressure reaches 2700 to 3000 psi. By GreenMachine in forum MSFS Screen Shot Forum, FAQ - Frequently Asked Questions - DreamFleet 727, FAQ - Frequently Asked Questions - DreamFleet General Aviation & 737-400 Products, DreamFleet General Aviation Support Forum. For example, in the table above, the Gulfstream G550 shows statistics for the 1st and 2nd hours of a long-range flight. We discuss the costs of ownership, with a breakdown of fixed and variable costs including the fuel costs, in the following articles: Cost for a Embraer Phenom 300  Cost for a Challenger 605. The Venezuelan armed forces forced the Learjet to land on suspicion the aircraft was being used for "illicit activities," possibly involving drugs smuggling. 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. Many Learjet 25 aircraft remain in regular use today, particularly in the United States, Mexico, and Canada. The Learjet 25 is listed explicitly in Federal Register 78 FR 39576. The report then shows lower fuel usage for the subsequent hours.

The bleed air is cooled in the heat exchanger by ram air entering the dorsal fin inlet and passing through the heat exchanger. Two disc-type indicators are flush mounted under the left engine.

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".

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