Fuel System Part 1

What is the maximum vapor pressure allowable for an aircraft fuel?. 7 psi. 5 psi. 3 psi.

What is the primary purpose of the crossfeed system?. It allows any tank to supply fuel to any engine. It bypasses the engine shutoff valve if it fails. It divides the fuel and sends it to the injectors.

In some aircraft with several fuel tanks, the possible danger of allowing the fuel supply in one tank to become exhausted before the selector valve is switched to another tank is prevented by the installation of. a fuel pressure warning signal system. a fuel pressure relief valve. an engine fuel pump bypass valve.

When moving the mixture control on a normally operating engine into the idle cutoff position, engine RPM should. slightly increase before the engine starts to die. slightly decrease and then drop rapidly. remain the same until the cutoff is effected, then drop rapidly.

Pressure fueling of aircraft is usually accomplished through. pressure connections on individual fuel tanks. at least one single point connection. individual fuel tank overwing and/or fuselage access points.

Normal fuel crossfeed system operation in multiengine aircraft. calls for jettisoning of fuel overboard to correct lateral instability. reduces contamination and/or fire hazards during fueling or defueling operations. provides a means to maintain a balanced fuel load condition.

Fuel jettisoning is usually accomplished. through a common manifold and outlet in each wing. by gravity flow into the outboard wing tanks and overboard through a common outlet in each wing. through individual outlets for each tank.

Fuel 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). dump limit valves or a low-level circuit. standpipes in the fuel tanks.

What can be done to eliminate or minimize the microbial growth problem in an aircraft jet fuel tank?. Use anti-icing and antibacterial additives. Add CO(2) as a purgative. Keep the fuel tank topped off.

A fuel totalizer is a component which indicates the. total amount of fuel being consumed by all engines. amount of fuel in any given tank. amount of fuel in all tanks.

When an aircraft is fueled from a truck or fuel farm that has not been contaminated, daily draining. is not required because fuel trucks and fuel farms may make use of laser contaminant identification technology. of strainers and sumps is combined with periodic filter changes and inspection to ensure fuel is contaminant free. is only required if the fuel truck or farm has not been in continuous service.

A fuel jettison system is required under certain conditions if the maximum takeoff weight exceeds the maximum landing weight. What regulations cover the requirements of fuel jettisoning?. 14 CFR Parts 43 and 91. 14 CFR Parts 23 and 25 and CAM 4b. 14 CFR Parts 21 and 43 and CAM 8.

Fuel-boost pumps are operated. to provide a positive flow of fuel to the engine. primarily for fuel transfer. automatically from fuel pressure.

How does temperature affect fuel weight?. Cold fuel is heavier per gallon. Warm fuel is heavier per gallon. Temperature has no effect.

What are the four general types of fuel quantity gauges?. Sight glass, mechanical, electrical, and electronic. Electrical, electronic, bourbon tube, and litmus indicator. Electrical, direct reading static pressure type, sight glass, and litmus indicator.

When defueling an aircraft, which of the following must be accomplished?. Defuel inside the hangar when fire suppression is available. Defuel outside the hangar when possible. Always defuel outside the hangar.

The probe of a capacitance-type fuel level gauge is essentially a. float-actuated variable capacitor. capacitor with fuel and air acting as one plate. capacitor with fuel and air acting as a dielectric.

Flapper valves are used in fuel tanks to. reduce pressure. prevent a negative pressure. act as check valves.

What is one disadvantage of using aromatic aviation fuels?. A fuel intercooler is required. Deteriorates rubber parts. Results in low fuel volatility.

When inspecting a fuel system, the aviation mechanic should check all valves located downstream of boost pumps with the pumps. at idle. dormant. operating.

Aircraft pressure fueling systems instructional procedures are normally placarded on the. fuel control panel access door. lower wing surface adjacent to the access door. aircraft ground connection point.

A probe or a series of probes is used in what kind of fuel quantity indicating system?. Selsyn. Capacitor. Synchro.

Why is it necessary to vent all aircraft fuel tanks?. To ensure a positive head pressure for a submerged boost pump. To exhaust fuel vapors. To limit pressure differential between the tank and atmosphere.

Why is the capacitance fluid quantity indicating system more accurate in measuring fuel level than a mechanical type?. Only one probe and one indicator are necessary for multiple tank configurations. It measures in gallons and converts to pounds. It measures by weight instead of volume.

Which of the following statements is true?. A fuel pressure gauge is not a differential pressure indicator. A fuel pressure gauge indicates the pressure of the fuel entering the carburetor. A fuel pressure gauge indicates the pressure of the fuel entering the combustion chamber.

What method would be used to check for internal leakage of a fuel valve without removing the valve from the aircraft?. Place the valve in the OFF position, drain the strainer bowl, and with boost pump on, watch to see if fuel flows to the strainer bowl. Remove fuel cap(s), turn boost pump(s) on, and watch for bubbling in the tanks. Apply regulated air pressure on the downstream side of the fuel pump and listen for air passing through the valve.

Select one means of controlling the fuel temperature on turbine-powered aircraft. Engine bleed air to the fuel filter. Engine bleed air to the fuel tank. Engine bleed air to a heat exchanger.

One advantage of electrical and electronic fuel quantity indicating systems is that the indicator. can be located any distance from the tank(s). has no movable devices. always measures volume instead of mass.

An aircraft's integral fuel tank is. usually located in the bottom of the fuselage. a part of the aircraft structure. a self-sealing tank.

Why is the main fuel strainer located at the lowest point in the fuel system?. It traps any small amount of water that may be present in the fuel system. It is near the fuel tank heater to help prevent vapor lock in the system. It filters and traps all micro-organisms that may be present in the fuel system.

The function of a fuel heater is to. protect the engine fuel system from ice formation. protect the fuel from freezing. heat the fuel to combustion temperature.

Which of the following statements is true?. A fuel heater cannot use engine bleed air as a source of heat. A fuel heater can use engine lubricating oil as a source of heat. A fuel heater cannot use engine lubricating oil as a source of heat.

A drip gauge may be used to measure. the amount of fuel in the tank. system leakage with the system shut down. fuel pump diaphragm leakage.

Which of the following would give the first positive indication that a change-over from one fuel tank to another is needed?. Fuel pressure warning. Fuel pressure gauge. Fuel quantity indicator.