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M14 > 14.2 > Flashcards

14.2 Flashcards

1
Q

What is the engine indicating system that is named as primary indications?

A

Performance Indications

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2
Q

What is the engine indicating system that is named as secondary indications?

A

System Indications

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3
Q

This engine indicating system monitors the performance and the limits of the engine and sets the thrust for different flight phases.

A

Engine Trend Monitoring

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4
Q

This engine indicating system monitors the operation of engine systems such as the oil or fuel system. They are also used to detect malfunctions quickly.

A

System Indications

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5
Q

This is done on the ground to detect engine problems at an early stage. It uses engine parameters that are automatically recorded by ACMS.

A

Engine Trend Monitoring

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6
Q

Where can you find the engine indications which have a combination of gauge type analog display and digital readouts?

A

ECAM

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7
Q

What variables are indicated on the engine system indicator?

A

Fuel uses, oil temp, oil quantity, oil pressure, nacelle temperature, engine vibration

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8
Q

What variables are indicated on the engine performance indicator?

A

EPR, EGT, N1, N2

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9
Q

What are the warnings and cautions displayed on the CAM engine system indications?

A

Low oil pressure, system exceeds a limit, oil filter clog, thrust reverser unlocked

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10
Q

How does the ACMS provide the recorded engine data for engine trend monitoring?

A

print-out from cockpit printer and ACARS

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11
Q

What are the 3 diff. analyses done to indicate a trend towards a limit?

A

Thermodynamic analysis, mechanic-dynamic analysis, oil consumption analysis

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12
Q

This analysis checks the pressures and temperatures along the gas flow path. It also monitors VSV, VBV, active clearance control and fuel flow.

A

Thermodynamic Analysis

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13
Q

This analysis generates an alert when the oil consumption exceeds

A

Oil consumption Analysis

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14
Q

This analysis mainly checks for failures in the rotor system such as imbalances and bearing failures by checking engine vibration and rotor speed signals.

A

Mechanic-dynamic Analysis

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15
Q

What is the N1 and N2 indications for?

A

for low pressure rotor and high-pressure rotor indication

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16
Q

What type of sensor measures rotor speed for N1 which is located on the low-pressure driveshaft?

A

Variable Reluctance sensor

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17
Q

What type of sensor measures rotor speed for N2 which is located in HP rotor AGB?

A

Tachometer

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18
Q

What speed limit indication shows the maximum permitted rotor speed?

A

a red line

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19
Q

How can you reset the exceedance indication for modern aircraft?

A

Automatically done with the next engine start

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20
Q

What does the amber line indicate for the N1 indication?

A

Maximum available thrust

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21
Q

What does the blue circle or white line indicate for the N1 indication?

A

Actual throttle position

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22
Q

It corresponds to the engine thrust as it is the ratio of the total pressure at the turbine outlet (P5) to the total pressure at the fan inlet (P2).

A

EPR indication

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23
Q

What type of sensor is used for EPR?

A

Pressure sensor

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24
Q

For earlier types of computers, what type of EPR transmitter uses electromechanical pressure transducers?

A

Bourdon tube

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25
Q

It calculates the EPR for modern engines and uses electronic pressure transducers rather than electromechanical transducers.

A

FADEC

26
Q

What indication is necessary to monitor the high temperature in the engine exhaust to see when a limit is exceeded?

A

EGT indication

27
Q

This temperature is directly behind the combustion chamber where the hot gas hits the high-pressure turbine.

A

Turbine inlet temperature

28
Q

The highest temperature of the engine is directly behind the combustion chamber where the hot gas hits the high-pressure turbine. This temperature is called

A

Turbine Inlet Temperature

29
Q

TIT can be higher that 1400° C thus it is not easy to measure. What is the possible way of measuring the TIT?

A

EGT is measured at colder location between the high- and low-pressure turbine. This is possible because EGT has direct relationship with TIT

30
Q

What type of sensor is used for measuring the EGT?

A

Thermocouple

31
Q

How are thermocouples connected in order to measure the average exhaust gas temperature?

A

thermocouples are connected in parallel

32
Q

Why are thermocouples paralleled in groups in parallel junction boxes?

A

To make probe replacement easier

33
Q

In what condition is ET allowed to exceed the amber line value (maximum EGT)?

A

during take-off or go around

34
Q

It is a very important secondary engine indication that enables you to identify a rotor imbalance which can be the first sign of engine damage.

A

Vibration monitoring

35
Q

What type of sensors are used for measuring the radial acceleration of the rotor system which are located in the compressor and turbine area?

A

Accelerometers

36
Q

What are the two types of accelerometers used to measure engine vibration?

A

Electromagnetic accelerometer, piezoelectric-crystal type

37
Q

How does electromagnetic sensor function?

A

it has a permanent magnet and a fixed coil, the coil moves up and down with vibration and induces an AC voltage

38
Q

How does a piezoelectric crystal sensor function?

A

it generates a voltage when a force is applied to the crystal and presses against the base plate when the sensor is accelerated

39
Q

This mode of indication measures the vibration of the N1 rotor using the forward sensor.

A

FAN

40
Q

This mode of indication measures the vibration of the N1 rotor using the aft sensor.

A

Low Pressure Turbine

41
Q

This mode of indication measures the vibration of the N2 rotor using the aft sensor.

A

N2

42
Q

This mode of indication shows the unfiltered vibration from the aft sensor and is used when a rotor speed signal is not available.

A

BB

43
Q

What sensor is used for fan balancing?

A

Trim balance sensor

44
Q

What indications does fuel flow indicating system provides for the pilot?

A

Actual fuel flow to engines, fuel used

45
Q

What indication shows the mass of fuel which is burned since the last engine start on ground?

A

Fuel used

46
Q

What indication allows you to monitor the performance and economic operation of the engines?

A

Fuel flow indication

47
Q

What type of sensor is used to generate the fuel flow and fuel used indications which measures the mass flow of fuel between the fuel control unit and the fuel nozzles?

A

Fuel Flow Transmitter

48
Q

What system computer does the calculation for fuel flow and fuel used for modern aircrafts?

A

FADEC

49
Q

What component measures the oil quantity for engine oil monitoring system?

A

Oil quantity transmitter

50
Q

What unit is responsible for the measurement and display of the oil quantity?

A

EIU

51
Q

What are the two types of oil quantity transmitter used for oil quantity indication?

A

Capacitance type, reed switch type

52
Q

This type of oil quantity transmitter has a metal tube with a float assembly that contains permanent magnets inside and a multi switch assembly.

A

Reed Switch Type

53
Q

What type of sensor does oil pressure indicator have that senses the pressure difference between the total oil pressure in the oil supply line and the vent pressure in the oil tank?

A

Oil pressure transmitter

54
Q

What are the two main types of oil pressure transmitter?

A

Bourdon tube type, strain gage type

55
Q

What indications are provided in a low oil pressure situation?

A

Warning message and acoustic warning in cockpit

56
Q

What is the sequence of events that will occur in case of low oil pressure?

A

Low oil pressure switch closes, signal is sent to FC and warning message is displayed in the cockpit

57
Q

What are the 2 types of oil temperature sensors used for oil temp. indication?

A

Thermocouple, Thermistor

58
Q

This element catches larger particles which are 0.015mm in size.
The problem with this element is that it is not changed very often and each inspection takes time.

A

Scavenge oil filter

59
Q

This is used for oil contamination monitoring where it catches metal particles that are attracted to its magnet. It can be easily removed and checked.

A

Magnetic chip detector

60
Q

How does the magnetic chip detector function?

A

the resistance decreases when particles connect the 2 chip detector magnets, when the resistance gets below the limit, the ECU sends maintenance message to PFR

M14 (8 decks)

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