Aircraft fuel system

100問 • 1年前

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To prevent vapor lock in fuel lines at high altitude, some aircraft are equipped with:

Booster pumps

(1) Gas-turbine engine fuel systems are very susceptible to the formation of ice in the fuel filters. (2)A fuel heater operates as a heat exchanger to warm the fuel. Regarding the above statements,

Both no.1 and no.2 are true

What minimum required markings must be placed on or near each appropriate fuel filler cover on utility category aircraft?

The word ‘Avgas’ and the minimum fuel grade.

A fuel system must be designed to prevent fuel-vapor ignition caused by:

lightning

What minimum required markings must be placed on or near each appropriate fuel filler cover on utility category aircraft?

The word ‘Avgas’ and the minimum fuel grade.

What are the four general types of fuel quantity gauges? 1. Sight glass 2. Mechanical 3. Electrical 4. Electronic 5. Bourdon tube 6. Vane-type transmitter 7. Litmus indicator 8. Direct-reading static pressure type

1,2,3,4

Which of the following is employed to maintain lateral stability when jettisoning fuel?

Two separate independent systems

Flapper valves are used in fuel tanks to:

act as check valves

A drip gauge may be used to measure:

the amount of fuel in the tank

The use of turbine fuels in aircraft has resulted in some problems not normally associated with aviation gasolines. One of these problem is

microbial contaminants.

Entrained water in aviation turbine fuel is a hazard because of its susceptibility to freezing as it passes through the filters. What are common methods of preventing this hazard?

anti-icing fuel additives and fuel heater.

Aircraft defueling should be accomplished

In the open air for good ventilation.

A fuel temperature indicator is located in the fuel tanks on some turbine-powered airplanes to tell when the fuel may be:

In danger of forming ice crystals.

(1) A fuel pressure relief valve is required on an aircraft positive-displacement fuel pump. (2) A fuel pressure relief valve is required on an aircraft centrifugal fuel boost pump. Regarding the above statements,

Only no.1 is true

The electronic-type fuel quantity indicating system consists of a bridge circuit,

An amplifier, an indicator, and a tank unit.

What precautions must be observed if a gravity-feed fuel system is permitted to supply fuel to an engine form more than one tank at a time?

The tank airspaces must be interconnected.

What is the recommended practice for cleaning a fuel tank before welding?

Steam clean the tank interior.

When installing a rigid fuel line, ½ inch in diameter, at what intervals should the line supported?

16 inches

How may the antiknock characteristics of a fuel be improved?

By adding a knock inhibitor.

What type of remote-reading fuel quantity indicating system has several probes installed in each fuel tank?

Electronic

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.

Which of the following would be most useful to locate and troubleshoot an internal fuel leak in an aircraft fuel system?

A fuel system schematic.

What is the purpose of flapper-type check valves in integral fuel tanks?

To prevent fuel from flowing away from the boost pumps.

What flight safety-related advantage does a pressure fueling system provide?

Reduces the chances for fuel contamination.

What type of fuel-booster pump requires a pressure relief valve?

Sliding vane

A fuel totalizer is a component which indicates the:

Amount of fuel in all tanks.

As a general rule, which statement is true regarding fuel leaks?

Stains, seeps, and heavy seeps (in addition to running leaks) are considered flight hazards when located in unvented areas of the aircraft.

The location of leaks and defects within the internal portions of the fuel system can usually be determined by:

Observing the pressure gauge and operating the selector valves.

Integral fuel tanks on transport aircraft are:

Formed by the aircraft structure.

What is the dielectric (nonconducting material) in a capacitance-type fuel quantity indicating system?

Fuel and air in the tank.

A transducer in a fuel pressure system serves what function?

Converts fluid pressure directly through a transmitter to the indicator.

Why are integral fuel tanks used in many large aircraft?

To reduce weight.

A capacitance-type fuel quantity indicating system measures fuel in:

Pounds

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

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

A fuel pressure warning switch contacts close and warning light is turned on when:

The fuel pressure drops below specified limits.

Which of the following is necessary to effectively troubleshoot a fuel pressure warning system?

The manufacturer’s maintenance manuals.

When routing a fuel line between two rigidly mounted fittings the line should:

Have at least one bend between such fittings.

When inspecting a fuel system, you should check all valves located downstream of boost pumps with the pumps:

Operating

An electrical-type fuel quantity indicating system consists of an indicator in the cockpit and a:

Float-operated transmitter installed in the tank.

The vapor pressure of aviation gasoline is:

Lower than the vapor pressure of automotive gasoline.

What can be done to eliminate or minimize the microbial growth problem in an aircraft jet fuel tank?

Use anti-icing and antibacterial additives.

What is the primary purpose of the crossfeed system?

To allow the feeding of engine from any tank.

Fuel-boost pumps are operated:

To provide a positive flow of fuel to the engine.

One advantage of electrical and electronic fuel quantity indicating systems is that:

Several fuel tank levels can be read on one indicator

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

Capacitor

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?

Federal Aviation Regulation Part 23, 25, and CAM 4b.

In an electronic-type fuel quantity indicating system, the tank sensing unit is a:

Capacitor

What should be used to remove flux from an aluminum tank after welded repairs?

5 percent solution of nitric or sulfuric acid.

What is the purpose of a float-operated transmitter installed in a fuel tank?

It sends an electric signal to the fuel quantity indicator.

Fuel jettisoning past the limits prescribed by Federal Aviation Regulations is usually prevented by:

Dump limit valves or a low-level circuit.

The type of fuel-boost pump that separates air and vapor from the fuel before it enters the line to the carburetor is the:

Centrifugal-type pump.

(1) If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause increased fuel flow. (2) A measure of a gasoline’s tendency to vapor lock is obtained from the Reid vapor pressure test. Regarding the above statements,

Only no. 2 is true

(1) On a large aircraft pressure refueling system, a pressure refueling receptacle and control panel will permit one person to fuel or defuel any or all fuel tanks of an aircraft. (2) Because of the fuel tank area, there are more advantages to a pressure fueling system in light aircraft. Regarding the above statements,

Only no.1 is true

The presence of fuel stains around a fuel nozzle would indicate:

Clogged fuel nozzle.

(1) A fuel heater can use engine bleed air as a source of heat. (2) A fuel heater can use engine lubricating oil as a source of heat. Regarding the above statements,

Both no.1 and no.2 are true.

How does temperature affect fuel weight?

Cold fuel is heavier per gallon.

Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?

Riveting and resealing.

Why are centrifugal-type boost pumps used in fuel systems of aircraft operating at high altitude?

To supply fuel under pressure to engine-driven pumps.

An aircraft’s integral fuel tank is:

A part of the aircraft structure.

One advantage of electrical and electronic fuel quantity indicating systems is that the indicator:

Can be located an distance from the tank/s.

When fuel quantity is measured in pounds instead of gallons, the measurement will be more accurate because fuel volume:

Varies with temperature change.

Which gas is used for purging an aircraft fuel tank?

Carbon dioxide.

What must each fuel quantity indicator be calibrated to read during level flight when the quantity of fuel remaining is equal to the unusable fuel supply?

Zero

What is the maximum vapor pressure allowable for an aircraft fuel?

7 PSI

When inspecting a removable rigid fuel tank for leaks what procedure should be followed?

Pressurize the tank with air and brush with soapy water.

Pressure fueling or aircraft is usually accomplished through:

At least one single point connection.

How many engine drive fuel pumps per engine are required for engines requiring fuel pump?

One fuel pump for each engine.

According to Part 23, what minimum required markings must be placed at or near each appropriate fuel filler cove for reciprocating engine-powered airplanes?

The word ‘Avgas’ and the minimum fuel grade.

The purpose of the baffle plate in a fuel tank is to:

Resist fuel surging within the fuel tank.

The probe of a capacitance-type fuel level gauge is essentially a:

Capacitor with fuel and air acting as a dielectric

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 temperature indicator.

What unit would be adjusted to change the fuel pressure warning limits?

Pressure-sensitive mechanism.

(1) The fuel jettison valve must be designed to allow flight personnel to close the valve during any part of the jettisoning operation. (2) During the fuel jettisoning operation, the fuel must discharge clear of any part of the airplane. Regarding the above statements

Both no.1 and no.2 are true.

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.

Why is it necessary to vent all aircraft fuel tanks?

To limit pressure differential between the tank and atmosphere.

Which of the following precautions is most important during refueling operations?

Fuel to be used must be appropriately identified.

A transmitter in a fuel pressure warning system serves what function?

Converts fluid pressure to an electrical signal.

What should be used to inert an integral fuel tank before attempting repairs?

Carbon dioxide

A typical large transport aircraft fuel manifold system allows how many of the following? 1. All tanks can be serviced through a single connection. 2. Any engine can be fed from any tank 3. All engines can be fed from all tanks simultaneously. 4. A damaged tank can be isolated from the rest of the fuel system.

1, 2, 3, and 4.

Which statement concerning an electronic capacitance- type fuel quantity indicating system is true?

It has no moving parts in the tank.

The primary purpose of an aircraft’s fuel jettison system is to quickly achieve a:

Lower landing weight.

How is the outlet fuel pressure regulated on a submerged, single-speed, centrifugal-type fuel pump?

By the pump’s design and internal clearances.

Aircraft pressure fueling systems instructional procedures are normally placarded on the:

Fuel control panel access door.

What is one disadvantage of using aromatic aviation fuels?

Deteriorates rubber parts.

Which aircraft fuel quantity indicating system incorporates a signal amplifier?

Electronic

Why are jet fuels more susceptible to water contamination than aviation gasoline?

Jet fuel has a higher viscosity than gasoline.

Fuel baffles are installed in tanks to prevent _________ caused by changes in the attitude of the aircraft.

Surging

Normal fuel crossfeed system operation in multiengine aircraft

Provides a means to maintain a balanced fuel load condition.

The primary purpose of a fuel tank sump is to provide

Place where water and dirt accumulations in the tank can collect and be drained.

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 OFF position, drain the strainer bowl and with the boost pump on, watch to see if fuel flows to the strainer bowl.

Fuel system components must be bonded and grounded in order to:

Drain off static charges.

Fuel is moved overboard in most fuel jettison systems by:

Boost pumps.

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.

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 jettisoning is usually accomplished:

Through a common manifold and outlet in each wing.

Where is fuel pressure taken for the pressure warning signal on most aircraft engines?

Fuel pressure line of the carburetor.

Microbial growth is produced by various forms of microorganisms 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 and is not corrected? 1. Interference with fuel flow. 2. Interference with fuel quantity indicators. 3. Engine seizure. 4. Electrolytic corrosive action in a metal tank. 5. Lower grade rating of the fuel. 6. Electrolytic corrosive action in a rubber tank.

1, 2, 4

What unit is generally used to actuate the fuel pressure warning system?

Pressure-sensitive mechanism.

100

Fuel heaters are used with fuel systems for turbine engines to prevent _________ In the fuel from clogging system filters.

Ice crystals.

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