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Part 121 - CRJ 701/900 > Fuel > Flashcards

Fuel Flashcards

1
Q

FQGC

A

Fuel Quantity and Gauging Computer

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2
Q

How many fuel tanks?

A

5 in total

Left Wing
Center
Right Wing
Left Collector
Right Collector
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3
Q

Where are the ducts that vent and pressurize the fuel tanks?

A

Underneath the wings

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4
Q

What is the purpose of relief valves?

A

Eliminate possibility of excessive pressures building up within the tanks

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5
Q

How many fuel cross-flow systems and what powers each?

A

2 systems. 1 gravity, 1 powered.

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6
Q

What does the FQGC do?

A

Automatically controls refueling, powered fuel cross-flow and fuel transfer

It measures fuel quantity and temperature for display on EICAS

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7
Q

How does the FQGC calculate fuel quantity?

A

Quantity probes in fuel tank

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8
Q

How does the FQGC know if it’s on the ground or in flight?

A

Weight on Wheels signal

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9
Q

What does the FQGC do in flight to ensure accurate fuel quantity?

A

Takes into account effects like Pitch

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10
Q

How will you know if the FQGC loses attitude data?

A

Status message

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11
Q

What do compensator probes do?

A

Supply FQGC data which computes fuel density.

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12
Q

Where is the fuel temperature sensor?

A

In the right wing tank

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13
Q

When will fuel indication change to amber on ED1?

A
  1. Excess fuel imbalance
  2. Wing tanks less than 600lbs
  3. Total fuel is less than 1200lbs
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14
Q

When is a LO FUEL caution displayed?

A
  1. Fuel quantity in either wing tank is less than 600lbs
  2. Fuel quantity is less than 1,200 lbs
  3. Both collector tanks are low
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15
Q

What temperature is indicated by the fuel temperature probe?

A

Bulk fuel temperature in the right wing tank

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16
Q

When will bulk fuel temperature turn amber on the synoptic page?

A

When the temperatures are colder than -40

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17
Q

When will the temperature of the fuel being delivered to the engines turn amber on the synoptic page?

A

When the temperature of the fuel is colder than 5 degrees C.

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18
Q

What does it indicate if the fuel filter on the fuel synoptic page is amber?

A

A fuel filter bypass condition exists

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19
Q

Describe the normal flow of fuel in the fuel system.

A

Center Tank -> Wing Tank -> Collector Tank -> Engine

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20
Q

How is fuel transferred from center tank to the wing tanks?

A

Transfer Ejectors

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21
Q

Describe how the FQGC controls the transfer of fuel from the center tank to the wing tanks.

A

FQGC will automatically open and close Two transfer shutoff valves.

It will open them when wing tank quantity is 94% and close when 97%

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22
Q

Difference between Transfer Ejector, Scavenge Ejector and Main Ejector.

A

All move fuel from one place to another

Transfer = Center -> Wing
Scavenge = Wing -> Collector
Main = Collector -> Engine
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23
Q

How is fuel supplied to the engine before start and after start?

A

Before start: Boost Pump

After start: Main Ejector

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24
Q

By selecting the L boost pump Switchlight ON, _________ to operate if a low pressure condition is sensed.

A

Both pumps are armed

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25
Q

What does the fuel pass through after the main ejector?

A

The engine shutoff valve -> Fuel filter -> engine

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26
Q

What will close the fuel shut-off valves?

A

Pressing an ENG FIRE PUSH Switchlight

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27
Q

Where does the fuel come from for the APU?

A

The left collector tank

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28
Q

If the APU pump fails, but the APU is running, can it still get fuel?

A

Yes, it will still draw fuel into the system using suction feed

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29
Q

How can you close the APU SOV?

A

APU FIRE PUSH switchlight

30
Q

What is the purpose fo the X-flow pump?

A

Allows transfer between the wing tanks to correct a fuel imbalance and maintain lateral stability.

31
Q

If the FQGC detects a fuel imbalance, what will it do?

A

As long as the XFLOW switch is AUTO, it will activate cross-flow fuel pump to transfer fuel where it needs to go.

32
Q

What does selecting MAN on XFLOW AUTO OVERRIDE do?

A

Allows you to manually transfer fuel by using the L/R switchlight.

33
Q

How would you manually transfer fuel from the left to the right tank.

A

Press XFLOW AUTO OVERRIDE to MAN, then press the “R” switchlight.

34
Q

If the cross-flow pump fails, can we still transfer fuel?

A

Yes, through gravity.

35
Q

How do we open the gravity cross-flow valve?

A

By selecting the GRAVITY XFLOW switchlight

36
Q

How can gravity cross-flow e improved?

A

Sideslip

37
Q

Where is the refuel-refuel control panel?

A

Right wing leading edge root

38
Q

Why should we never remove gravity filler caps for the wing tanks if the tanks are full or fuel quantity is unknown?

A

Because the gravity filler caps are located below the maximum fuel lever. Removing them would cause fuel to spill out of the cap

39
Q

How can the fuel quantity be measured if fuel indicating system is inoperative?

A

Magnetic level indicators (MLS)

40
Q

MLS

A

Magnetic level indicators

41
Q

How much fuel in:

Each Main Tank: ?

Center Tank: ?

A

Each Main Tank: 7,492lbs

Center Tank: 4,610lbs

42
Q

The APU fuel shut-off valve is controlled by?

A

Manually with the APU FIRE PUSH switchlight

Manually with the APU PWR RUEL switchlight

43
Q

Can fuel flow from the wing to the center tank?

A

Nope

44
Q

What are NACA vents for?

A

They provide static and dynamic venting of the tanks and help maintain constant positive pressure

45
Q

FCC

A

Fuel Control Computer

46
Q

How does the FCC keep fuel quantity indications accurate when in changing attitudes?

A

By making corrections based on AHRS information

47
Q

Where are the collector tanks located?

A

In the center section of the fuselage near the wing root at the lowest point of the fuel system

48
Q

Do we have bladder tanks in the CRJ?

A

No

49
Q

Where are the pressure relief valves and their purpose?

A

On the lower wing. They relieve over pressure in the fuel tank at approximately 5 psi

50
Q

How many ejector pumps?

A

8

51
Q

How many scavenge ejector pumps?

A

4; synoptic page is not updated from the old 200

52
Q

When is the center tank used?

A

Normally only when on extended flights

53
Q

Minimum Limit for bulk fuel on takeoff:

A

-28C

54
Q

Limit for fuel entering the fuel filter

A

5 degrees celsius

55
Q

Difference between transfer and Cross-Flow

A

Transfer moves fuel from the center tank to the wings

Cross-flow is used to correct for a fuel imbalance

56
Q

What does hitting the MAN X-FLOW switch do?

A

Prevents the automatic X-flow of fuel by the pump. It will turn the pump off if it’s on and prevent it from coming on in the future.

57
Q

When is XFLOW pump automatically de-energized?

A

When the lower tank that is being filled exceeds the other by 50lbs.

58
Q

When using the MAN XFLOW, what tank do you select?

A

The low one. The tank that will be receiving fuel.

59
Q

What Items are on the APU DIR BUS?

A

APU Starter

Refuel/Defuel Control Panel.

60
Q

The ______ status message appears if the fuel service panel is switched on.

A

“AUTO XFLOW INHIBIT”

61
Q

The Fuel Check Valve check conducted on the first flight of the day ensures fuel pressure from the ______ cannot supply fuel to the opposite side engine.

A

Operating engine’s main ejector.

62
Q

Aside from the scavenge ejectors, how does fuel enter the collector tanks?

A

One way flapper valves allow fuel to move by gravity into the collector tank

63
Q

What prevents outward flow of the fuel during wing low maneuvers?

A

One-way flow valves attached to the internal wing ribs

64
Q

Purpose of NACA vents:

A

provide positive header pressure on the fuel in the tanks

65
Q

When do the DC electric boost pumps operate?

A

During engine start sequence and/or when a main ejector fails

66
Q

FSC

A

Fuel System Computer

67
Q

Purpose of FSC

A

Controls and monitors operation of the fuel system.

68
Q

How many channels in the FSC and how many are active?

A

2 channels, 1 at a time, the other standby.

69
Q

Scavenge Ejectors

A

Transfer from wings to collectors

70
Q

Transfer ejectors

A

Transfer fuel from the center to the wing tanks

Part 121 - CRJ 701/900 (25 decks)

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