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Bell 407 > Fuel > Flashcards

Fuel Flashcards

1
Q

Total capacity of the fuel system

gallons and pounds

A

130 total gallons/127.8 usable gallons

869 total pounds

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2
Q

How many fuel tanks do we have and what type are they?

A

2 crash-resistant, bladder type fuel cells

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3
Q

What is the capacity of the forward fuel cell?

A

37.6 gallons usable

256 pounds

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4
Q

What is the capacity of the main fuel cell?

A

90.2 gallons usable

626 pounds

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5
Q

How are the fuel cells connected?

A

1 gravity line

1 pressure transfer line

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6
Q

Describe the fuel transfer pumps

A

2 electrically operated fuel transfer pumps

Mounted on the sump plate of the forward cell

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7
Q

Describe the fuel boost pumps

A

2 electrically operated fuel boost pumps

Mounted on the sump plate of the main cell

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8
Q

Describe the drain valves

A

2 electrically operated fuel drain solenoid valves
Mounted on the sump plate of the forward and main cell, 1 each

1 Airframe Fuel Filter drain, must have boost pumps and fuel valve on to have fuel flow to that filter sump

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9
Q

Describe the fuel shutoff valve

A

1 electrically operated fuel shutoff valve

Located above the main cell

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10
Q

Describe the fuel quantity indicating system

A

3 fuel quantity probes: 1 in forward cell, 2 in main cell

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11
Q

Describe the low fuel detection system

A

Activates CAS message: LOW FUEL when fuel reaches:
100 +/- 10 pounds for 13 +/- 3 seconds continuous
Mounted on the main cell sump plate

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12
Q

Describe the Airframe Fuel Filter

A

Airframe mounted fuel filter on right side
Has a CAS message light test button
Activates CAS message: Fuel Filter when the filter is in impending bypass
Must be cleaned prior to next flight

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13
Q

Describe the Engine Mounted Fuel Filter

A

Engine mounted, CEFA fuel filter, on left side of engine
Outboard portion being the fuel filter portion
LRB extends at pressure differential of 2.5 +/- 0.5 PSID
Filter bypasses at 3.4 PSID

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14
Q

Generally, describe the 4 fuel system components that come after the Airframe Fuel filter.

A
  1. CEFA: filters fuel on the outboard portion of the filter assembly prior to entering the HMU
  2. ECU: part of the FADEC system, monitors engine power demands and signals HMU metering valve to provide proper amount of fuel to combustion chamber
  3. HMU: a fuel pump provides high pressure fuel to the fuel control assembly that sends the correct amount to the combustion chamber, as directed by the ECU
  4. Fuel Nozzle: atomizes and injects fuel to combustion liner at proper spray angle to support combustion
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15
Q

Fuel system amount, in pounds, at which the system is at full capacity

A

869 pounds

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16
Q

Fuel system amount, in pounds at which transfer from the forward to the main cell begins.

A

770 pounds

17
Q

What occurs when the fuel system reaches 770.0 pounds total?

A

Transfer from forward to main cell begins
Fuel is continued to be drawn from main cell
CG moves forward during this portion of fuel burn.

18
Q

Fuel system amount, in pounds, at which fuel is consumed equally from the forward and main cell.

A

508.6 pounds

19
Q

What occurs when the fuel system reaches 508.6 pounds total?

A

Fuel is consumed equally from both the forward and main cell

CG is at its most forward point during fuel burn

20
Q

Fuel system amount, in pounds, at which fuel is consumed from the forward cell until it is depleted

A

344.1 pounds

21
Q

What occurs when the fuel system reaches 344.1 pounds total?

A

Fuel is consumed from the forward cell until the forward cell is depleted
CG moves aft during this portion of fuel burn.

22
Q

Fuel system amount, in pounds, at which the forward cell is empty.

A

193.1 pounds

23
Q

What occurs when the fuel system reaches 193.1 pounds total?

A

The forward fuel cell is empty

CG is at its most aft position during fuel burn

24
Q

Fuel system amount, in pounds, at which the Low Fuel CAS is displayed

A

100 +/- 10 pounds

25
Q

What occurs when the fuel system reaches 100 +/- 10 pounds total?

A

If held for 13 +/- 3 seconds continuously, the Low Fuel CAS will display
CG will shift forward during this stage of fuel burn

26
Q

What is the procedure if both transfer pumps fail?

A
  1. Hold down the Forward Fuel Quantity Button until Forward Fuel Quantity is displayed.
  2. Subtract that amount, or 151.0 pounds, whichever is less, from the total
  3. Plan landing accordingly
27
Q

Fuel pressure range

A

8-25 PSI

Bell 407 (19 decks)

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