All electrical switches must be in OFF position.īefore fueling an aircraft by using the pressure fueling method, what important precaution should be observed? The truck pump pressure must be correct for that refueling system. Fuel to be used must be appropriately identified. Which of the following precautions is most important during refueling operations? All outside electrical sources must be disconnected from the aircraft. What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure? Air-fuel separators. One of these problems is increasing viscosity of fuel as fuel temperature lowers at altitude. The use of turbine fuels in aircraft has resulted in some problems not normally associated with aviation gasolines. Converts fluid pressure directly through a transmitter to the indicator. Transmits electrical signal proportional to the fluid pressure. moisture ice crystals contamination.Ī transducer in a fuel pressure system serves what function? Transmits an electrical signal to the transmitter for fluid pressure. flapper check dump.įuel heaters are used with fuel systems for turbine engines to prevent _ in the fuel from clogging system filters. Many fuel tanks incorporate _ valves to prevent fuel from flowing away from the boost pump or tank outlet when the aircraft is in a high 'G' maneuver. Two inches.įuel baffles are installed in tanks to prevent _ caused by changes in the attitude of the aircraft. What is the minimum distance allowed between a fuel tank and the fire wall separating the engine? One-half inch. 1, 2, 3, and 4.Ī fuel system must be designed to prevent fuel-vapor ignition caused by over-heating. A damaged tank can be isolated from the rest of the fuel system. All engines can be fed from all tanks simultaneously.Ĥ. All tanks can be serviced through a single connection.ģ. Two fuel pumps for each engine.Ī typical large transport aircraft fuel manifold system allows how many of the following?ġ. How many engine driven fuel pumps per engine are required for engines requiring fuel pumps? Two engines can share one fuel pump. It divides the fuel and sends it to the injectors.įuel system components must be bonded and grounded in order to drain off static charges. It bypasses the engine shutoff valve if it fails. What is the primary purpose of the crossfeed system? It allows any tank to supply fuel to any engine. How many vents, arranged so that they are not likely to become plugged at the same time, must be used in multiengine fuel systems? Two. provides a means to maintain a balanced fuel load condition. reduces contamination and/or fire hazards during fueling or defueling operations. Normal fuel crossfeed system operation in multiengine aircraft calls for jettisoning of fuel overboard to correct lateral instability. Allow operation of the left engine when the right fuel-boost pump is inoperative. Allow operation of engines from one tank. (Refer to Figure 17.) What is the purpose of the pump crossfeed valve? Balance the fuel in the tanks. Which procedure must be followed when defueling aircraft with sweptback wings? Defuel all the tanks at one time. dump limit valves or a low-level circuit. gravity and engine-driven fuel pumps.įuel jettisoning past the limits prescribed by Federal Aviation Regulations is usually prevented by closely monitoring the fuel quantity and turning off the fuel dump switch(es). Federal Aviation Regulation Part 21, 43 and CAM 8.įuel is moved overboard in most fuel jettison systems by boost pumps. Federal Aviation Regulation Part 23, 25 and CAM 4b. What regulations cover the requirements of fuel jettisoning? Federal Aviation Regulation Part 43 and 91. Two interconnected systems.Ī fuel jettison system is required under certain conditions if the maximum takeoff weight exceeds the maximum landing weight. Which of the following is employed to maintain lateral stability when jettisoning fuel? Two separate independent systems. (2) During the fuel jettisoning operation, the fuel must discharge clear of any part of the airplane. (1) The fuel jettison valve must be designed to allow flight personnel to close the valve during any part of the jettisoning operation. The primary purpose of an aircraft's fuel jettison system is to quickly achieve a lower landing weight. through individual outlets for each tank. by gravity flow into the outboard wing tanks and overboard through a common outlet in each wing. Fuel jettisoning is usually accomplished through a common manifold and outlet in each wing.
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