Fuel Flashcards

0
Q

Backup to scavenge pumps?

A

Gravity flapper valves

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1
Q

Left fuel boost pump… What bus?

A

Dc batt bus

Therefore left eng start if battery start

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2
Q

Backup to main ejectors?

A

Fuel pumps

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3
Q

Qty MLI’s?

A

Left wing…2
Right wng..2
Ctr ……….1

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4
Q

Fuel temp sensor located?

A

Right wing

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5
Q

Scavenge ejector?

A

Wing to collector tank

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6
Q

Main ejector?

A

Collector to engine

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7
Q

Transfer ejector?

A

Center to wing

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8
Q

Apu fuel pump location?

A

Left collectot tank

If failure of pump?

APU has suction feed capability

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9
Q

What provides fuel to respective side engine?

A

Main ejectors

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10
Q

When is fuel transferred

Center to wing?

A

When wing is less than 93%

Transfer ejector opens

Closes when 97%

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11
Q

Bulk fuel temp read from?

A

Rt wing tank

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12
Q

How many scavenge ejectors/ tank

A

2

Only 1 shown on synop

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13
Q

NACA scoops?

A

Vents tanks to atmosphere

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14
Q

Fuel transfer is from_____to______

Provided by_____?

A

Fuel”transfer”is from center to wing

By transfer ejectors

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15
Q

Powered crossflow?

A

Wing tank 200 low

Until 50 over

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16
Q

What’s automatically controls refueling powered fuel crossflow and fuel transfer

A

FQFC

fuel quantity gauging computer

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17
Q

What calculates fuel quantity in each tank

A

Fuel quantity gauging computer(FQGC)

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18
Q

How many fuel probes?

A

Six probes in each tank

One probe in each collector tank

Three probes in the center tank

19
Q

Fuel temperature is continuously monitored by a sensor installed in the?

A

Right wing tank

20
Q

Where are the collector tanks located?

A

Two collector Tank’s are located in the forward section of the center wing tank

21
Q

Capacity of collector tank?

A

10 gallons

22
Q

Function of the NACA scoops?

A

Vents the tanks to the atmosphere to prevent pressure buildup caused by refueling

Ram air slightly pressures the wing tanks Inflight

23
Q

What supplies fuel to the collector tanks?

A

Scavenge ejectors

24
What supplies fuel to the engines?
Main ejectors
25
In the event of an APU pump failure?
A negative gravity relief valve allows fuel The valve opens when a negative gravity condition exists or when the APU pump fails
26
How is the fuel heated?
Via the fuel oil heat exchanger Hot engine oil heats the fuel
27
Fuel imbalance?
300 pounds on takeoff 800 pounds other phases
28
Powered crossflow?
200 pounds low to 50 pounds over
29
How many MLI's?
Two in each wing tank One in the center tank
30
Pressing in the fuel pump switches?
Arm the fuel pumps
31
Center tank fuel limitation?
4400 4400 500 If more than 500 in the. Center tank we must have more than 4400 in the Wing tanks
32
Below what engine fuel temperature is take off prohibited?
+5c
33
The engine fuel SOV is controlled by?
The ENG FIRE PUSH button
34
The APU fuel SOVis controlled by?
PWR FUEL SWITCH APU FIRE PUSH
35
Which fuel boost pump is operational during a battery start?
The left boost pump
36
Are there any EICAS messages When there is fuel transfer from the center to the wing tanks?
No
37
What is reqd ( elec system)for pressure fueling?
DC PWR
38
Fuel pumps operate when?
Low fuel pressure Engine starts
39
Where are the collector tanks located
In the center tank at a point that is lower than the left or right wing tanks
40
The Apu pump take fuel from where for the APU
From the left collector tank
41
What supplies fuel to the engine’s when a main ejector pressure is low
DC electric boost pumps
42
The fuel system computer controls the operations of the fuel system
..
43
Apu and engine sovs are electric
..
44
Anytime the crosstie closes?
All ties close
45
QRH??Priority of multiple messages?
Electrical Hydraulics Pneumatics Other