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M15✅ > 15.14 EXHAUST GAS TEMP/INTERSTAGE TURBIE TEMPN > Flashcards

15.14 EXHAUST GAS TEMP/INTERSTAGE TURBIE TEMPN Flashcards

1
Q

Why do gas turbine engines require an exhaust gas temperature (EGT) indication

A

Monitor high temp experienced by turbine engines to prevent thermal damage

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2
Q

Where is the highest temperature located

A
  • directly behind combust chamber
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3
Q

Explain turbine inlet temp

A
  • hot gas hits high pressure turbine
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4
Q

Explain the exhaust gas temperature (EGT) indicator

A
  • shows average temp measured by the individual thermocouples
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5
Q

Explain turbine inlet temperature

A
  • visual indication at instrument panel of the temperature of gases entering the turbine
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6
Q

Explain performance indications

A
  • also known as primary indications
  • monitor performance, limits of engine, and set thrust for different flight phases
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7
Q

Explain system indications

A
  • also called secondary indications
  • monitor oil or fuel systems
  • also used to detect malfunctions quickly
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8
Q

Explain engine trend monitoring

A
  • done on ground to detect engine problems at an early stage
  • Uses engine parameters that are automatically recorded by aircraft condition monitoring system (ACMS)
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9
Q

What are the 2 engine performance indications

A
  • rotational fan speed (N1)
  • Engine pressure ratio (EPR)
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10
Q

Explain engine system indications (secondary engine indications)

A
  • monitor correct operation of engine systems
    E.g. for oil system -> monitors quantity,pressure temp etc
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11
Q

Advantage of engine trend monitoring

A

Alerts operator to a problem at an early stage

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12
Q

To determine EPR, where are the measurements taken from

A
  • engine inlet
  • and turbine exhaust
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13
Q

What does it mean if there is a AMBER/RED line indication on EPR DISPLAY

A
  • shows maximum available thrust
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14
Q

What does the BLUE circle show on EPR display

A
  • corresponds to the actual throttle position
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15
Q

Explain flexible take-off

A
  • uses minimum thrust possible to take off depending on ambient temperature
  • reduces engine wear
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16
Q

What does the oil pressure indicator show

A
  • engine oil pump discharge pressure
17
Q

Why is it important to have a oil pressure indicator

A
  • prevent engine failure from inadequate lubrication and cooling
18
Q

What are the main 2 types of oil pressure transmitters

A
  • Bourdon tube type
  • Strain gauge type
19
Q

Explain low oil pressure switch

A
  • oil pressure under limit
  • low oil switch closes
  • signal sent to flight display as a warning
20
Q

Explain oil inlet temperature indicator

A
  • Used to indicate the temperature of oil as it enters the oil pressure pump
21
Q

What is the primary component responsible for measuring engine oil temperature

A
  • oil temperature sensor
  • Resistance temperature detector (RTD) most common in aircraft engines
22
Q

Most turbine powered aircraft use a low pressure warning switch which is located where

A

Outlet of each fuel boost pump

23
Q

A low fuel temperature can be corrected with the use of what component

A
  • fuel heater
24
Q

The fuel flow indicating system provides 2 different indications to the flight crew which are

A
  • actual fuel flow to engines
  • fuel used since engine was started
25
Q

Explain fuel flow transmitter

A

Measures mass flow of fuel between fuel control unit and fuel nozzle

26
Q

Explain synchronous mass flow (fuel flow transmitter)

A
  • turns turbine against spring and deflection angle is measured
  • impeller rotates continuously by electric motor
27
Q

Explain motorless mass flow

A
  • do not require electric motor
  • use fuel itself to generate acceleration
  • fuel flow turns small turbine
28
Q

How is the engine rotor speed expressed

A
  • as a percentage of a 100% design speed
29
Q

Each rotor speed indication has 3 main parts

A
  • sensor
  • data transmission
  • indication
30
Q

Explain variable reluctance sensor

A
  • known as magnetic reluctance sensor / magnetic pickup
  • detects change in magnetic flux
  • phonic wheel/fan blades alter magnetic circuit
31
Q

Explain tachometer generator

A
  • has permanent magnet that is driven by gearbox with speed proportional to N2
  • generates 3-phase AC voltage
32
Q

What are the 3 different types of rotor speed indications

A
  • display with clock-type scale
  • display with moving vertical bar
  • classical electromechanical indicator
33
Q

What occurs if N1 redline limit is exceeded on modern engines

A
  • speed and duration of overspeed is recorded and initiates a report from engine trend monitoring
34
Q

What are the main parts of the engine vibration monitoring system

A
  • FD indication 0-6
  • 1 or 2 vibration sensors
  • computer that collects and filters vibration data for indicating
35
Q

Explain vibration sensors (accelerometer)

A
  • measure the radial acceleration of the rotor system
  • 2 sensors ( one located in compressor, another in turbine area)
36
Q

What are the 2 types of accelerometers used on engines to measure vibration

A
  • electromagnetic accelerometer
  • piezoelectric- crystal type sensor
37
Q

What are the 2 types of accelerometers used on engines to measure vibration

A
  • electromagnetic accelerometer
  • piezoelectric- crystal type sensor
38
Q

Hello

A

M15✅ (16 decks)

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