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E175 Systems > Fuel > Flashcards

Fuel Flashcards

1
Q

How many fuel tanks are there, where are they located?

A

2; 1 in each wing

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2
Q

What is the purpose of the collector box?

A

Keeps the primary ejector pump submerged to ensure constant fuel flow to respective engine

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3
Q

Where is the collector box located?

A

The inboard section of each wing

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4
Q

What is the purpose of the tank vent system?

A

Ensures pressure between tank and ambient remains within structural limits

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5
Q

What is the total fuel quantity?

A

20,935 lbs

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6
Q

When does the Fuel Low Level caution EICAS indication (gauge indications turn yellow) occur?

A

1320 lbs in respective tank

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7
Q

When does the Fuel Low Level warning occur?

A

660 lbs in respective tanks

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8
Q

Where is the fuel temperature measurement taken from? What is the minimum temperature?

A

Left wing; -37 degrees C

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9
Q

How many fuel pumps are there?

A

13

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10
Q

What fuel pumps are on the aircraft?

A

2 engine-driven pumps; 2 primary (main) ejector pumps; 6 scavenge ejector pumps; 2 AC electric pumps; 1 DC electric pump

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11
Q

What is the primary fuel source to the engine?

A

The engine-driven fuel pumps

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12
Q

What is the purpose of the engine-driven fuel pumps?

A

To provide motive flow to the primary ejector pumps

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13
Q

What provides the pressure for motive flow to the scavenge pumps?

A

Engine-driven pumps

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14
Q

Where are the ejector pumps located?

A

In the collector tanks

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15
Q

How do the ejector pumps work?

A

Venturi-type/motive flow; maintains head pressure in the fuel line going to the respective engine

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16
Q

What is the purpose of the scavenge pumps?

A

To maintain adequate fuel level in the collector tanks

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17
Q

What is the purpose/uses of the AC fuel pumps?

A

Back-up for the ejector pumps; used for engine starts; used during crossfeed operations

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18
Q

What provides fuel to the APU when the engine-driven pump EDP is not running?

A

AC Pump 2

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19
Q

Where is the DC fuel pump installed?

A

Only in the right wing

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20
Q

What is the purpose of the DC fuel pump?

A

Provides pressurized fuel to APU start when AC power to the AC fuel pump 2 is not available AND WORKS FOR ENGINES

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21
Q

What is the purpose of the fuel crossfeed?

A

Allows fuel to both engines from one tank, thus equalizing the fuel quantity in each tank

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22
Q

What is the max fuel imbalance?

A

794 lbs; CAS message appears at about 800 lbs

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23
Q

When does the max fuel imbalance CAS message disappear?

A

When fuel is within 100 lbs balanced

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24
Q

What happens when LOW 1 is selected?

A

Right wing tank electric pump turns ON and X-FEED valve opens

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25
Q

What happens when LOW 2 is selected?

A

Left wing tank electric pump turns ON and X-FEED valve opens

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26
Q

When are the Engine Fuel Shutoff Valves used, why?

A

When there is a fire, the fire handles will close the respective shutoff valves

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27
Q

Where is the refueling and refueling panel?

A

Single-point or over wing

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28
Q

How is refueling or defueling powered?

A

DC Bus 1 and 2 when the batteries are on and the HOT BAT BUS 2 when the aircraft is off

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29
Q

What is the Primary ejector pump?

A

It is a venturi pump with no moving parts and no electrical power used by the respective engine - powered by motive flow

30
Q

What pump(s) is used once an engine is started?

A

Primary (main) ejector pump

31
Q

What is the surge/vent tank?

A

Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level; equalizes tank pressure with atmosphere in flight during refueling

32
Q

Can fuel be transferred from the tank-to-tank or be dumped overboard?

A

No

33
Q

What happens when the crossfeed switch is selected to LOW 1?

A

Crossfeed valve is opened; commands the ACMP 2 to ON to provide fuel from the right tank to both engines

34
Q

What is the only way to close the engine fuel SOV?

A

Pull the associated engine fire extinguishing handle

35
Q

When will the FUEL 1(2) LO LEVEL EICAS be presented?

A

660 lbs of fuel remaining in the associated tank; fuel low level caution occurs at 1320 lbs in the associated tank (which is just amber on the EICAS fuel indication, no EICAS message)

36
Q

When might the Fuel 1 (2) lo level message be indicated, beside low fuel?

A

Engine failure may cause scavenge pump to stop fuel transfer to the Collector Box (loss of motive flow to the scavenge pumps). The loss of fuel transfer system to the Collector Box may trigger the EICAS WARNING message FUEL 1 (2) LO LEVEL. The EICAS message may display even though fuel quantity indication on the EICAS or MFD FUEL System Synoptic Page is up to 3970 lb in that tank. So there is fuel, just not as much as usual in the collector box.

37
Q

When can the DC fuel pump be used and where is it located?

A

It can be used on the ground and in flight for the engines or the APU and is in the right fuel tank

38
Q

To correct any lateral imbalances using the crossfeed function, the pilot must select the XFEED to ____ while the two AC aux pump switches remain in _____

A

Low 1 or Low 2 and Auto

39
Q

With the engines running, through which pumps are the engines and the APU fed?

A

The primary ejector pumps

40
Q

What provides fuel to the APU when the engines are running? What if they aren’t running?

A

The primary ejector pumps, or when not running the AC and DC pumps

41
Q

Where can the aircraft be pressure refuled and defuled? Where are the gravity refuel ports?

A

On the right leading edge fuel panel, gravity fed are on both wing tanks above the wing

42
Q

What is the purpose of the baffle and flap check valves?

A

To prevent fuel from flowing from the collector tank to the surge tank when in a turn or uncoordinated flight.

43
Q

Where will water collect in the fuel tank?

A

There are 2 drain valves that drain water for the surge tank and the collector tank, by gravity. One is next to the AC auxillary fuel pump. The other is close to the wing junction. These are on the preflight slides under the wings and fuselage.

44
Q

What are the parts of the fuel indication system?

A

Electrical fuel quantity, mechanical fuel quantity, fuel temperature, and fuel low level indication

45
Q

Is the fuel low level probe independent from the fuel quantity probe?

A

Yes. They are separate.

46
Q

How is fuel quantity measured electronically? Mechanically?

A

There is a capacitance-type electrical fuel indicating subsystem consisting of a probe and a FMU fuel metering unit. If the electrical system fails, the mechanical MLI Magnetic Level Indicators (external) allow the aircraft to be dispatched.

47
Q

When is the temperature of the fuel shown in green?

A

As long as the temperature is above -37deg C. Below temperature that it is amber.

48
Q

Where is the fuel temperature sensor located?

A

In the left wing tank only.

49
Q

How do the MLIs work?

A

There is a float attached to the drip stick that is at the fuel level, and that shows on the MLI

50
Q

In case of electical emergency, which ACMP fuel pump will be powered by the RAT?

A

ACMP 2 via the AC ESS BUS (ACMP 1 is powered via AC BUS 1)

51
Q

When is the DC pump used?

A

For APU or engine start in the air, or on the ground if the ejector pumps and ACMPs are not available

52
Q

What supplies power to the DC fuel pump?

A

DC ESS BUS 2

53
Q

When will the Fuel Pumps turn on while in AUTO?

A

The ACMPs will turn on via the SPDA if there is an ejector pump failure.

54
Q

What monitors the output of the electrical pumps?

A

Pressure switches, which send the information to the MAUs and ASCB to display on EICAS

55
Q

What are the 2 green circles on the fuel synoptic page? How do they close?

A

They are the fuel SOVs which can colse via the fire handles, preventing fuel from entering the fire zones.

56
Q

What happens if the fuel pressure transducer senses low pressure?

A

The signal will be sent to the MAU and then the ACSB commanding the ACMP to turn ON (when in AUTO)

57
Q

If the APU is inop and AC ground power (GPU) is not available, what will provide fuel for engine start?

A

The DC fuel pump will initially supply fuel until the primary ejector pump works via motive flow

58
Q

Can the APU be fed fuel from the left tank?

A

Yes. Select Crossfeed Low 2 with AC power available. If the left engine is operating, the left ejector pump will also supply fuel to the APU.

59
Q

Where should the fuel truck be grounded to the aircraft prior to pressurized refueling?

A

To the right landing gear

60
Q

Where should the fuel truck be grounded to the airplane for gravity refueling?

A

To the right landing gear AND the fueling nozzle should be grounded to the grounding points below the wings (placarded)

61
Q

What does the power selection switch on the refueling/defueling panel do?

A

Selects either normal electrical source (DC BUS 1 and 2) to the refuel control solenoids and the FCU fuel control unit

OR battery source powered by HOT BATT BUS 2 which allows fueling with the APU not running and no extenral power connected.

62
Q

How does the refueling switch on the refueling/defueling panel work?

A

The Refueling switch opens or closes the refuel SOV. Closed closes the SOV in both auto and manual modes. Open allows the FCU to control the refuel SOV via the refuel control solenoid. The FCU will close the valves to stop refueling when the preselected quantity is reached.

63
Q

How does the refuel selection switch work on the refuel/defuel panel?

A

The switch operates in AUTO or Manual modes. AUTO allows the FCU to control the refuel SOV. In Manual mode, the fueler has to manually stop the fuel flow by selecting the refueling switch to the closed position or stoping the external fuel supply.

64
Q

How does the DEFUELING switch work on the refuel/defuel panel?

A

The defueling switch is either open or closed. To start defueling, the switch must be in the open position. All switches are guarded so they return to the normal or closed positions when the access door is closed.

65
Q

What to the (left hand tank) closed and (right hand tank) closed indicator lights mean on the refuel/defuel control panel? What about the defuel open light?

A

They indicate the refuel SOV is closed.

The defuel open light indicates the defuel SOV is open.

66
Q

How do the fuelers select the fuel quantity on the refuel/defuel panel?

A

Use the increase/decrease toggle switch to change the fuel selected.

67
Q

What is the TKSEL switch on the refuel/defuel panel?

A

It changes the top line (above the fuel amount selected) to indicate the total fuel in both tanks or left or right tanks. When moved to TEST, the fuel quantity subsystem is tested and FAIL will illuminate on the panel if failed.

68
Q

How does defueling work?

A

Suction is either provided by the outside source or inside by the aircraft fuel pumps, or can be used together. To begin, the APU or AC power must be available. Then ACMP 1 and 2 would be on. Then select low 1 or low 2. And stop defueling by turning all back OFF and closing the defuel switch. If suction defueling, use the crossfeed knob but not the ACMPs, unless desired

69
Q

FCU

A

Fuel Conditioning Unit

70
Q

FMU

A

Fuel Metering Unit

E175 Systems (18 decks)

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