Fuel system part 3

Microbial growth is produced by various forms of micro-organisms that live and multiply in the water interfaces of jet fuels. Which of the following could result if microbial growth exists in a jet fuel tank?. Interference with fuel flow, interference with fuel quantity indicators, and electrolytic corrosive action in a metal tank. Interference with fuel quantity indicators, engine seizure, or a lower grade rating of the fuel. Interference with fuel flow, lower grade rating of the fuel, or electrolytic corrosive action in a rubber tank.

The use of turbine fuels in aircraft has resulted in some problems not normally associated with aviation gasolines. One of these problems is. increasing viscosity of fuel as fuel temperature lowers at altitude. higher vapor pressure. microbial contaminants.

As a general rule, which statement is true regarding fuel leaks?. Stains, seeps, and heavy seeps are not flight hazards. All fuel leaks regardless of location or severity are considered a hazard to flight. Stains, seeps, and heavy seeps (in addition to running leaks), are considered flight hazards when located in unvented areas of the aircraft.

A fuel pressure warning switch contacts close and warning light is turned on when. a measured quantity of fuel has passed through it. the fuel flow stops. the fuel pressure drops below specified limits.

Fuel is moved overboard in most fuel jettison systems by. boost pumps. gravity. gravity and engine-driven fuel pumps.

What flight safety-related advantage does a pressure fueling system provide?. Keeps the aircraft within weight and balance limitations. Reduces the chances for fuel contamination. Reduces the time required for fueling.

Integral fuel tanks on transport aircraft are. easily removed for service or inspection. constructed of plastic or fiberglass. supported by the aircraft structure.

Which of the following precautions is most important during refueling operations?. All outside electrical sources must be disconnected from the aircraft. Fuel to be used must be appropriately identified. All electrical switches must be in OFF position.

The primary purpose of an aircraft's fuel jettison system is to quickly achieve a. lower landing weight. balanced fuel load. reduced fire hazard.

What is the minimum distance allowed between a fuel tank and the fire wall separating the engine?. One-half inch. One inch. Two inches.

When installing a rigid fuel line, 1/2 inch in diameter, at what intervals should the line be supported?. 24 inches. 12 inches. 16 inches.

What is one purpose of a fuel tank vent?. To maintain atmospheric pressure. To decrease fuel vapor pressure. To decrease tank internal air pressure.

If a bladder-type fuel tank is to be left empty for an extended period of time, the inside of the tank should be coated with a film of. engine oil. linseed oil. ethylene glycol.

When inspecting a removable rigid fuel tank for leaks, what procedure should be followed?. pressurize the tank with air and brush with soapy water. fill the tank with water and pressurize with air and brush with soapy water. pressurize the tank with air and submerge in water to locate leaks.

What type of fuel-booster pump requires a pressure relief valve?. Concentric. Sliding vane. Centrifugal.

Before 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. The truck pump pressure must be adjusted for minimum filter pressure. The aircraft's electrical system must be on to indicate quantity gauge readings.

How may the antiknock characteristics of a fuel be improved?. By adding a knock inhibitor. By adding a knock enhancer. By adding a fungicide agent.

Why are integral fuel tanks used in many large aircraft?. To reduce fire hazards. To facilitate servicing. To reduce weight.

What should be used to inert an integral fuel tank before attempting repairs?. CO(2). Water. Steam.

The vapor pressure of aviation gasoline is. lower than the vapor pressure of automotive gasoline. higher than the vapor pressure of automotive gasoline. approximately 20 psi at 100°F.

When fuel quantity is measured in pounds instead of gallons, the measurement will be more accurate because fuel volume. varies with temperature change. increases when temperature decreases. varies with changes in atmospheric pressure.

Which statement concerning an electronic capacitance-type fuel quantity indicating system is true?. It has no moving parts in the tank. It has two tubes separated by an electronic field in the tank. It utilizes a variable capacitor to indicate the fuel tank capacity.

What is the dielectric (nonconducting material) in a capacitance-type fuel quantity indicating system?. Outer shell of the capacitor. Fuel in the tank. Fuel and air in the tank.

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. Four. Six.

What is the purpose of flapper-type check valves in integral fuel tanks?. To allow defueling of the tanks by suction. To prevent fuel from flowing away from the boost pumps. To allow the engine-driven pumps to draw fuel directly from the tank if the boost pump fails.

On a large aircraft pressure refueling system, a pressure refueling receptacle and control panel will permit one person to. fuel or defuel any of the tanks on an aircraft. fuel any of the tanks on an aircraft. defuel any of the tanks on an aircraft.

Which of the following is necessary to effectively troubleshoot a fuel pressure warning system?. The manufacturer's maintenance manuals. AC 43.13-1, Acceptable Methods, Techniques, and Practices -- Aircraft Inspection and Repair. A set of Federal Aviation Regulations.

Fuel system components must be bonded and grounded in order to. drain off static charges. prevent stray currents. retard galvanic corrosion.

The type of fuel-boost pump that separates air and vapor from the fuel before it enters the line to the carburetor is the. gear-type pump. centrifugal-type pump. sliding vane-type pump.

Which of the following would be most useful to locate and troubleshoot an internal fuel leak in an aircraft fuel system?. Structural repair manual. Orthographic projection troubleshooting tree. Maintenance manual diagrams and descriptions.

What should be used to remove flux from an aluminum tank after welded repairs?. Soft brush and warm water. Five percent solution of nitric or sulfuric acid. Mild solution of soap and warm water.

What precautions must be observed if a gravity-feed fuel system is permitted to supply fuel to an engine from more than one tank at a time?. The tank airspaces must be interconnected. The fuel outlet ports of each tank must have the same cross-sectional area. Each tank must have a valve in its outlet that automatically shuts off the line when the tank is empty.

To prevent vapor lock in fuel lines at high altitude, some aircraft are equipped with. vapor separators. direct-injection-type carburetors. booster pumps.

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. Anti-foaming additives. Boost pumps.

A capacitance-type fuel quantity indicating system measures fuel in. pounds. pounds per hour. gallons.

The primary purpose of a fuel tank sump is to provide a. way to shut off fuel flow or to route the fuel to a desired location. place for contaminants and water to settle, with a drain valve to remove the impurities. way to manually operate valves on a fuel tank to isolate or direct fuel to a pump.

What method is used on turbine-powered aircraft to determine when the condition of the fuel is approaching the danger of forming ice crystals?. Fuel pressure warning. Fuel pressure gauge. Fuel temperature indicator.

What markings must be placed on or near each appropriate fuel filler cover on standard category aircraft?. The word 'Avgas' and the minimum fuel grade, and the total fuel tank capacity. The word 'Avgas' and the minimum fuel grade or designation for the engines, and the usable fuel tank capacity. The word 'Avgas' and the minimum fuel grade.

How is the outlet fuel pressure regulated on a submerged, single-speed, centrifugal-type fuel pump?. By the engine-driven pump's design and internal clearance. By the first check valve downstream from the pump. By the pump's design and internal clearances.

What unit would be adjusted to change the fuel pressure warning limits?. Fuel flowmeter bypass valve. Pressure-sensitive mechanism. Fuel pressure relief valve.