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M15 New > 15.14 > Flashcards

15.14 Flashcards

1
Q

Where is the hottest temperature

A

Directly behind the combustion chamber is where the gas hits the HPT

Called (TIT)

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2
Q

Temperature of TIT

A

Higher then 1400 degrees C

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3
Q

What has a direct relationship to the TIT

A

EGT

(Max can be 600-900 degrees C )

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4
Q

Where is EGT taken from

A

Between high and low pressure turbine or behind the low pressure turbine

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5
Q

What part of the engine is temperature taken from

A

First stage turbine inlet guide vanes

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6
Q

What component measures temperature

A

Thermocouples

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7
Q

How are thermocouples placed

A

Around the permitter of the engine turbine casing or exhaust duct

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8
Q

What are the parts of the dual thermocouple

A

Two electrically independent junctions within a single probe

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9
Q

What are primary indicators

A

Performance indications which monitor performance and set thrust for flight phases

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10
Q

What are secondary indications

A

System indications which measure operation of the engine and detect malfunctions

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11
Q

What is engine trend monitoring

A

Done on ground to detect engine problems at an early stage

Uses parameters recorded by ACMS

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12
Q

What is the ACMS

A

Aircraft condition monitoring system

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13
Q

What two parameters give us thrust

A

Rotational speed of the fan , N1

Engine pressure ratio

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14
Q

What does the oil system monitor

A

Oil quantity

Oil pressure

Oil temperature

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15
Q

3 analyses of engine trend monitoring

A

Thermodynamic - pressure and temperature along gas flow path

Mechanic dynamic - failure in rotors

Oil consumption

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16
Q

What is compared to get epr

A

Engine turbine discharge pressure to the pressure of the ram air at the inlet of the engine

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17
Q

What does the amber or redline show for EPR

A

Maximum thrust available

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18
Q

What’s the blue circle in an epr indication

A

Actual throttle position

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19
Q

What’s flexible take off

A

Standard take off thrust setting used on airbus

Boeing is (assumed temperature derate)

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20
Q

When is full thrust (TOGA) used

A

Wet/icy condition or short runway / hot and high

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21
Q

What pressure does oil pressure indicator show

A

Engine oil pump discharge pressure

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22
Q

Oil pressure transmitters

A

Bourdon tube type

Strain gauge

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23
Q

Shape and material of bourdon tube

A

C shaped or helical with oval cross section

Made of copper , brass , aluminium or nickel alloy (money)

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24
Q

How does a strain gauge work

A

When object undergoes strain resistance changes proportionally

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25
Q

Shape and material of strain gauge

A

Small rectangular shape

Made of foil , metal wire or semiconductor materials

26
Q

How does a low oil pressure switch work

A

When pressure is below a limit switch closes and signal sent to computer as a warning

27
Q

What are the two types of oil temperature sensor

A

Resistance temperature detector

Thermocouple ( 2 dissimilar metals )

28
Q

How is cavitation caused

A

High fuel pump demand

29
Q

What kind of warning do fuel sensors give

A

Impeding blockage and risk of cavitation

30
Q

When an auxiliary pump on an aircraft is off how is pressure created

A

Pressure created by the engine driven pump

31
Q

What warning switch is used on turbine powered aircraft

A

Low pressure warning switch at the outlet of each fuel boost pump

32
Q

Where is the announciator for each switch located

A

Adjacent to the boost on/off switch on fuel panel in flight deck

33
Q

What two indications for fuel flow is there

A

Actual fuel flow

Fuel used since engine start

(Indicated in kg , lbs , tons)

34
Q

What’s measured on synchronous mass flow

A

Deflection angle

35
Q

How does motorless mass flow generate acceleration

A

Fuel flow

36
Q

How is rotor speed indicated

A

Percentage of 100% design speed

37
Q

Rotor speed indication main parts

A

Sensor

Data transmission

Indication

38
Q

What are the other names for a variable reluctance sensor

A

Magnetic reluctance sensor

Magnetic pickup

39
Q

How does a variable reluctance sensor work

A

Detects change in a magnet and ferromagnetic target

40
Q

What affect does the target have to do with the magnet and air gap

A

As the target moves closer to the magnet the air gap decreases which reduces magnetic reluctance and vice versa

41
Q

How does a tachometer generator work

A

Generates 3 phase ac voltage which is sent to the FADEC to generate speed signal

42
Q

Why is the tachometer called dedicated engine

A

Supplies electrical power to the computer

43
Q

3 types of rotor speed indication

A

Clock type scale

Moving vertical bar

Classical electromechanical indicator

44
Q

What colour is the over speed indicator line

A

Red

If engine exceeds for the duration of the overspeed it’s recorded and initiates report from engine trend monitoring

45
Q

What does vibration indicate

A

Rotor imbalance

46
Q

What the range of vibration units

A

0-6

47
Q

How many vibration sensors

A

1 or 2

48
Q

What’s the vibration computer called

A

Engine vibration monitoring unit (EVMU)

49
Q

What do accelerometers do

A

Measure the radial acceleration of the rotor system

50
Q

Where are the 2 vibration sensors located

A

Compressor area and turbine area

51
Q

What’s the electromagnetic accelerometer

A

Magnet with two springs

When vibration occurs the coil moves up and down with the sensor housing

52
Q

How does a piezoelectric crystal sensor work

A

Voltage is generated when you apply a force to the crystal

53
Q

What’s shown when n1 or n2 speed signal fails

A

Broadband (BB) vibration

54
Q

What does a electrical torque meter system consist of

A

Torque meter assembly

Phase detector

Indicator

55
Q

How is a hydraulic torque meter operated

A

By engine oil metered through a valve that is controlled by a helical ring gear that moves in response to the applied torque

56
Q

Why is a power assurance test needed

A

Check that the engine can accelerate and decelerate to and from idle with a given epr within a specific time period

57
Q

During a power assurance test which way is the plane placed

A

Into the wind with chucks in front and behind the wheels

58
Q

How quickly should the engine accelerate and decelerate during a power assurance test

A

Accelerate to given speed - 7s or less

Decelerate to idle - 8s or less

59
Q

After n1 operating above 70% how do you shut down

A

Run at idle for 10m to decrease engine temp and safely shutdown the engine

60
Q

Where is low pressure sensor in the fuel system

A

After the outlet from the low pressure filter

M15 New (18 decks)

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