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Airframe > Aircraft Fuel Systems > Flashcards

Aircraft Fuel Systems Flashcards

1
Q

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?

A

Zero

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2
Q

The primary purpose of a fuel tank sump is to provide a

A

Place for contaminants and water to settle, with a drain valve to remove the umpurities.

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3
Q

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

A

Observing the pressure gauge and operating the selector valves.

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4
Q

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

A

Fuel and air in the tank.

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5
Q

Fuel system components must be bonded and grounded in order to

A

Drain off static charges.

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6
Q

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

A

Capacitor with fuel and air acting as a dielectric.

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7
Q

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,

A

Both no.1 and no.2 are true

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8
Q

Before fueling an aircraft by using the pressure fueling method, what important precaution should be observed?

A

The truck pump pressure must be correct for that refueling system.

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9
Q

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?

A

The tank airspaces must be interconnected.

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10
Q

When an aircraft is fueled from a truck or fuel farm that has not been contaminated, daily draining

A

Of strainers and sumps is combined with periodic filter changes and inspection to ensure fuel is contaminant free.

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11
Q

Fuel is moved overboard in most fuel jettison systems by

A

Boost pumps

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12
Q

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

A

The word ‘AVgas’ and the minimum fuel grade.

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13
Q

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

A

It ha no moving parts in the tank.

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14
Q

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

A

Pressure-sensitive mechanism

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15
Q

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

A

Centrifugal-type pump

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16
Q

When installing a rigid fuel line, 1/2 inch diameter, at what intervals should the line be supported?

A

16 inches

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17
Q

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

A

The manufacturer’s maintenance manual

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18
Q

The presence of fuel stains around a fuel nozzle would indicate

A

Clogged fuel nozzle

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19
Q

The vapor pressure of aviation gasoline is

A

Lower than the vapor pressure of automotive gasoline.

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20
Q

1) The fuel jettison 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,

A

Both no.1 and no.2 are true.

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21
Q

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 some advantages to a pressure fueling system in light aircraft.
Regarding the above statements,

A

Only no.1 is true.

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22
Q

Why are integral fuel tanks are used in many large aircraft?

A

To reduce weight.

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23
Q

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

A

By the pump’s design and internal clearances.

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24
Q

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?

A

Federal Aviation Regulation part 23,35, and CAM 4b

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25
Q

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

A

Ice crystals.

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26
Q

Some turbine powered aircraft have a fuel temperature indictor located in the cockpit to

A

Monitor the fuel temperature during high altitude flight.

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27
Q

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

A

In the tank that moves a connecting arm to the wiper on a variable resistor in the tank.

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28
Q

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

A

Riveting and resealing.

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29
Q

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

A

The fuel pressure drops below specified limits.

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30
Q

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

A

Reduces the chances for fuel contamination.

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31
Q

Select one means of controlling the fuel temperature on turbine-powered aircraft.

A

Engine bleed air to a heat exchanger.

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32
Q

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?

A

Anti-icing fuel additives and fuel heater.

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33
Q

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

A

CO2

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34
Q

Why is the main fuel strainer located at the lowest point in the fuel system?

A

it traps any small amount of water that may be present in the fuel system.

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35
Q

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

A

An amplifier, an indicator, and a tank unit.

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36
Q

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.

A

1,2,3,4

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37
Q

If it is necessary to enter an aircraft’s fuel tank, which procedure should be avoided?

A

Conduct the defueling and tank purging operation in an air-conditioned building.

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38
Q

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

A

Pressurize the tank with air and brush with soapy water.

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39
Q

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

A fuel pressure warning signal system.

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40
Q

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

A

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

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41
Q

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

A

Varies with temperature change.

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42
Q

A typical large transport aircraft fuel manifold systems 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.

A

1,2,3, and 4

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43
Q

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

A

Two separate independent systems.

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44
Q

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

A

Only no.2 is true

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45
Q

How many vents, arranged so that they are not likely to become plugged at the same time, must be used in multi-engine fuel systems?

A

Two

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46
Q

The purpose of a diaphragm in a vane-type fuel pump is to

A

Compensate fuel pressures to altitude charges.

47
Q

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

A

It sends an electrical signal to the fuel quantity indicator.

48
Q

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

A

Fuel pressure line of the carburetor.

49
Q

Flapper valves are used in fuel tanks to

A

act as check valves

50
Q

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

A

To prevent fuel from flowing away from the boost pumps.

51
Q

What is the primary purpose of the crossfeed system?

A

It allows any tank to supply fuel to any engine.

52
Q

A transducer in a fuel pressure system serves what function?

A

Converts fluid pressure directly through a transmitter to the indicator.

53
Q

What is one purpose of a fuel tank vent?

A

To maintain atmospheric pressure.

54
Q

Why is it necessary to vent all aircraft fuel tanks?

A

To limit pressure differential between the tank and atmosphere.

55
Q

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

A

Capacitor

56
Q

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

A

Electronic

57
Q

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

A

Capacitor

58
Q

Pressure fueling of aircraft is usually accomplished through

A

At least one single point connection.

59
Q

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

A

Sliding vane

60
Q

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

A

Jet fuel has a higher viscosity than gasoline.

61
Q

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

A

Dump limit valves or a low-level circuit.

62
Q

Why is the capacitance fluid quantity indicating system more accurate in measuring fuel level than a mechanical type?

A

It measures by weight instead of volume.

63
Q

A drip gauge may be used to measure

A

The amount of fuel in the tank.

64
Q

Fuel boost pumps are operated

A

To provide a positive flow of fuel to the engine.

65
Q

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

A

To supply fuel under pressure to engine-driven pumps.

66
Q

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

A

Fuel to be used must be appropriately identified.

67
Q

Aircraft pressure fueling systems instructional procedures are normally placarded on the

A

Fuel control panel access door.

68
Q

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.

A

Flapper

69
Q

How may the antiknock characteristics of a fuel be improved?

A

By adding a knock inhibitor.

70
Q

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

A

Resist fuel surging within the fuel tank.

71
Q

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

A

Steam clean the tank interior.

72
Q

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

A

Can be located any distance from the tank (s).

73
Q

What method would be used to check for internal leakage of a fuel valve without removing the valve from the aircraft?

A

Place the valve in the OFF position, drain the strainer bowl, and with boost pump on, watch to see if it flows to the strainer bowl.

74
Q

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

A

Lower landing weight

75
Q

When moving the mixture control on a normally operating engine into the idle cut off position, engine RPM should

A

Slightly increase before the engine starts to die.

76
Q

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

A

Engine oil

77
Q

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

A

5 percent solution of nitric or sulfuric acid.

78
Q

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

A

Maintenance manual diagrams and descriptions.

79
Q

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

A

Operating

80
Q

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

A

Microbial contaminants.

81
Q

1) A fuel pressure gauge is a differential pressure indicator.
2) A fuel pressure gauge indicates the pressure of the fuel entering the carburetor.
Regarding the above statements

A

Both no.1 and no.2 are true

82
Q

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

A

Converts fluid pressure to an electrical signal.

83
Q

What method is used on turbine-powered aircraft to determine when the condition of the fuel is approaching the danger of forming ice crystals?

A

Fuel temperature indicator.

84
Q

Integral fuel tanks on transport aircraft are

A

Supported by the aircraft structure.

85
Q

Fuel jettisoning is usually accomplished

A

Through a common manifold and outlet in each wing.

86
Q

one advantage of electrical and electronic fuel quantity indicating systems is that

A

Several fuel tank levels can be read on one indicator.

87
Q

How does temperature affect fuel weight?

A

Cold fuel is heavier per gallon.

88
Q

A digital fuel totalizer automatically indicates the amount of fuel used, fuel remaining, current rate of consumption, and fuel

A

Weight, aboard at takeoff.

89
Q

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

A

One fuel pump for each engine.

90
Q

1) The function of a fuel heater is to protect the engine fuel system from ice formation.
2) An aircraft fuel heater cannot be used to thaw ice in the fuel screen.
Regarding the above statements,

A

Only no.1 is true.

91
Q

A capacitance-type fuel quantity indicating system measures fuel in

A

Pounds

92
Q

Which of the following would give the first positive indication that a change-over from one fuel tank to another is needed?

A

Fuel pressure warning

93
Q

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 boost pump.
Regarding the above statements,

A

Only no.1 is true

94
Q

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

A

Pressure-sensitive mechanism

95
Q

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

A

Use anti-icing and antibacterial additives.

96
Q

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

A

Booster pumps

97
Q

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

A

7 PSI

98
Q

What is one disadvantage of using aromatic aviation fuels?

A

Deteriorates rubber parts.

99
Q

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?

A

Boost pumps

100
Q

Which aircraft fuel quantity indicating system incorporates a signal amplifier?

A

Electronic

101
Q

An aircraft’s integral fuel tank is

A

A part of the aircraft structure.

102
Q

Normal fuel crossfeed system operation in multiengine aircraft

A

Provides a means to maintain a balanced fuel load condition.

103
Q

Which procedure must be followed when defueling aircraft with swept back wings?

A

Defuel the outboard wing tanks first.

104
Q

A fuel totalizer is a component which indicates the

A

Amount of fuel in all tanks.

105
Q

Fuel baffles are installed in tanks to prevent ___ caused by changes in the altitude of the aircraft.

A

Surging.

106
Q

(Refer to Figure 17.) What is the purpose of the pump crossfeed valve?

A

Allow operation of engines from one tank.

107
Q

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,

A

Both no.1 and no.2 are true.

108
Q

When defueling an aircraft, which of the following must be accomplished?

A

Always defuel outside the hangar.

109
Q

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 ina rubber tank?

A

1,2,4

110
Q

Which gas is used for purging an aircraft fuel tank?

A

Carbon dioxide

111
Q

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

A

The word ‘Avgas’ and the minimum fuel grade.

112
Q

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

A

Lightning

113
Q

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

A

Have at least one bend between such fittings.

114
Q

What is the minimum distance allowed between a fuel tank and the fire wall separately from the engine?

A

One-half inch.

Airframe (17 decks)

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