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ATR type Rating > skyblue CBT oil and fuel > Flashcards

skyblue CBT oil and fuel Flashcards

1
Q

what does the engine oil system provide?

A

lubrication of bearings and gearboxes

supplies oil pressure for prop actuation

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2
Q

what is the capacity of the main oil tank?

A

14.4L

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3
Q

what is the oil system pressure maintained by the regulator?

A

55-65 psi

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4
Q

where is the oil tank?

A

intergral with the rear inlet casting

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5
Q

what does the single system provide oil to?

A

reducton gearbox and turbo machinery

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6
Q

what are the 2 subsystems that make up the oil system?

A

presure system and scavenge system

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7
Q

what does the gear pump do?

A

pressurises the system and routes it to a cooler

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8
Q

what does the low temperature valve by the pressure gear pump do?

A

returns oil to the tank to prevent a pressure surge during cold start

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9
Q

where is the oil cooler located?

A

the engine inlet

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10
Q

how does the oil cooler cool oil?

A

inlet air, if a clog develops there is a bypass valve

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11
Q

where does oil flow to from the oil cooler?

A

pressure regulating valve

pressure filter

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12
Q

what does the pressure regulating valve do?

A

maintains a constant oil pressure in relation to the air pressure

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13
Q

what opens if the pressure filter gets clogged?

A

bypass valve

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14
Q

what 8 components is oil fed to after the pressure filter?

A
  1. fuel heater
  2. fuel cooled oil cooler
  3. reduction gearbox
  4. oil low pressure switch
  5. pressure transducer

6 temp sensor

  1. accesory gearbox
  2. engine bearing cavitys
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15
Q

what does the low pressure switch do?

A

feeds pressure info to the FWS and EWD

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16
Q

when will we get a LO OIL warning?

A

when oil pressure drops below 40 psi

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17
Q

when is the oil pressure switch inhibited?

A

for 30 seconds during start

18
Q

what does the pressure transducer do?

A

sends pressure info to the MFD

19
Q

when will be get a OIL TEMP L caution?

A

when temp is below 0 on the ground

or below 45 when the engine is running with PL greater than 30 degrees

20
Q

when will we get an OIL TEMP H caution?

A

temp between 125 and 140C

21
Q

when will we get an OIL OVHT?

A

oil temp greater than 140C

22
Q

what does oil flow through to get to the reduction gearbox?

A

fuel heater and the fuel cooled oil cooler into the pressurised auxiliary oil tank

23
Q

where does oil flow to after the auxiliary oil tank?

A
  • reduction gearbox
  • propeller valve module (PVM)
  • electrical feathering pump
  • reduction gear train and bearings
24
Q

where is the chip detector installed?

A

gearbox cavity

25
Q

where does the scavenge pump draw oil to?

A

anti icing front inlet case and another filter

26
Q

what engine parts are lubricated?

A

7 bearing cavitys and the engine gearbox

27
Q

how is engine oil scavenged from the engine part?

A

by gravity from the accesory gearbox and bearing cavitys (cavity 2 is assisted by a jet pump, 6,7 is driven by a scavenge pump)

28
Q

what does the fuel go through prior to the HMU?

A

fuel heater

29
Q

how is the fuel heated through the heater?

A

transfers heat from the oil through a heat exchanger. heat is thermostatcally controlled

30
Q

where does the fuel go after the heater and filter?

A

hp pump

31
Q

what does an ENG FUEL CLOG caution mean?

A

clog in the high pressure pump filter

32
Q

what are the 2 functions of the HMU?

A
  1. deliver metered pressurised fuel to the engine
  2. provide high pressure motive flow to the engine jet pump
33
Q

where is excess fuel sent back to by the HMU?

A

high pressure pump

34
Q

where is fuel flow sensed?

A

after the HMU

35
Q

what does the fuel cooled oil cooler do prior to the flow divider?

A

cools oil via a heat exchanger

36
Q

where does the fuel flow after the fuel cooled oil cooler?

A

flow divider and nozzles

37
Q

what normally schedules fuel flow

A

electronic engine control (EEC)

38
Q

what 4 inputs from the flight deck does the EEC use to schedule fuel?

A
  1. power lever angle
  2. power management selector
  3. position of bleed air valves
  4. engine sensor information
39
Q

how is ambient conditions sent to the EEC?

A

from the ADC

40
Q

what feeds info to the HMU in manual mode when the EEC is unavailable?

A

power levers through a metering valve assembly

41
Q

how does the EEC command fuel flow to the HMU?

A

through a stepper motor

ATR type Rating (22 decks)

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