LESSON # 3 Flashcards

1
Q

Fuel from the LP Fuel filter passes to the (?) depending on RPM and FCU in the region of 600-800 psi. This HP fuel is then fed to the fuel control unit (FCU).

A

HP Pump/ High Pressure Pump

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2
Q

The (?) will meter the engines fuel requirements based upon a given set of conditions at any given time.

A

FUEL CONTROL UNIT (FCU)

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3
Q

Engines fuel requirements based upon a given set of conditions at any given time:

A

A. Throttle position.
B. Ambient Pressure (Pamb)
C. Ambient Temperature (T12)
D. HP Compressor RPM (N2)
E. Compressor Discharge Pressure (CDP)

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4
Q

Fuel in excess of that required is returned to the (?) of the HP pump.

A

inlet side

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5
Q

Metered fuel is then fed to the (?) via a throttles and HP cock.

A

flowmeter

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6
Q

The (?) can be a combined throttle and HP cock
lever or separate levers.

A

Fuel Control Operating Levers

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7
Q

The position of the (?) determines the power required.

A

Throttle Lever

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8
Q

The (?) controls the supply of fuel from the FCU to the burners, when closed the engine will be shut down, when open fuel will be available to the burners.

A

HP Shutoff Cock/ High Pressure Shutoff Cock

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9
Q

2 TYPES OF HEAT EXCHANGER

A
  1. FUEL/AIR HEAT EXCHANGER
  2. FUEL/OIL HEAT EXCHANGER
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10
Q

Similar to the heat exchanger used to heat the fuel, this heat exchanger will use the HP fuel supply to cool the engine oil.

A

FUEL/OIL HEAT EXCHANGER

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11
Q

Prevent fuel flowing to the burners during the starting phase until such time as fuel pressure is sufficient to give good atomisation of the fuel thus ensuring good light-up.

A

PRESSURISING AND DUMP VALVE

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12
Q

Allow sufficient pressure to build up within the Fuel Control Unit (FCU) servo/hydraulic control systems ensuring correct metering of fuel supply is achieved during starting.

A

PRESSURISING AND DUMP VALVE

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13
Q

Enable a rapid dump of fuel remaining in the pipelines to the burners on shutdown.

A

PRESSURISING AND DUMP VALVE

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14
Q

From the fuel/oil heat exchanger HP metered fuel passes to the
pressurising and dump valve. Its function is to:

A. Prevent fuel flowing to the burners during the starting phase
until such time as fuel pressure is sufficient to give good
atomisation of the fuel thus ensuring good light-up.
B. Allow sufficient pressure to build up within the Fuel Control
Unit (FCU) servo/hydraulic control systems ensuring correct
metering of fuel supply is achieved during starting.
C. Enable a rapid dump of fuel remaining in the pipelines to the
burners on shutdown

A

PRESSURISING AND DUMP VALVE

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