15.14 Engine Indication Systems (Level 1, 3 Questions)

Question 1

Why is an exhaust gas temperature (EGT) indication required on all gas turbine engines?
A) To increase engine thrust
B) To monitor turbine speeds
C) To prevent thermal damage by monitoring high temperatures

Answer 1

C) To prevent thermal damage by monitoring high temperatures

Question 2

What does the EGT indication help identify in a turbine engine?
A) Fuel consumption rate
B) When a temperature limit has been exceeded
C) The airspeed of the aircraft

Answer 2

B) When a temperature limit has been exceeded

Question 3

What condition does the EGT indication help prevent?
A) Compressor stall
B) Electrical overload
C) Thermal damage to the engine

Answer 3

C) Thermal damage to the engine

Question 4

Why is it difficult to measure the Turbine Inlet Temperature (TIT) directly?
A) The temperature fluctuates too rapidly
B) The TIT is higher than 1400 °C, making it hard to measure accurately
C) Sensors cannot operate at low temperatures

Answer 4

B) The TIT is higher than 1400 °C, making it hard to measure accurately

Question 5

Where is the highest temperature in a gas turbine engine typically found?
A) In the exhaust nozzle
B) At the fan inlet
C) Directly behind the combustion chamber, hitting the high-pressure turbine

Answer 5

C) Directly behind the combustion chamber, hitting the high-pressure turbine

Question 6

What does TIT stand for in a turbine engine context?
A) Turbine Internal Thrust
B) Thrust Inlet Temperature
C) Turbine Inlet Temperature

Answer 6

C) Turbine Inlet Temperature

Question 7

Why can exhaust gas temperature (EGT) be measured at a colder location in the engine?
A) EGT sensors are only designed for low-pressure areas
B) EGT has a direct relationship to the Turbine Inlet Temperature (TIT)
C) TIT is not affected by exhaust gas flow

Answer 7

B) EGT has a direct relationship to the Turbine Inlet Temperature (TIT)

Question 8

Where is the EGT typically measured in a gas turbine engine?
A) In front of the combustion chamber
B) Between the high- and low-pressure turbine or behind the low-pressure turbine
C) At the engine intake

Answer 8

B) Between the high- and low-pressure turbine or behind the low-pressure turbine

Question 9

Why do maximum EGT readings vary between 600 °C and 900 °C?
A) Because of varying fuel qualities
B) Due to differences in airflow rates
C) Because of different measuring points in the engine

Answer 9

C) Because of different measuring points in the engine

Question 10

Which temperature is measured directly at the entry point of hot gases into the high-pressure turbine?
A) Exhaust Gas Temperature (EGT)
B) Turbine Inlet Temperature (TIT)
C) Turbine Outlet Temperature (TOT)

Answer 10

B) Turbine Inlet Temperature (TIT)

Question 11

What does Exhaust Gas Temperature (EGT) typically monitor?
A) The temperature of fuel entering the combustion chamber
B) The temperature of gases after passing through the turbine
C) The temperature of air entering the compressor

Answer 11

B) The temperature of gases after passing through the turbine

Question 12

Which temperature is measured between stages of a multi-stage turbine?
A) Interstage Turbine Temperature (ITT)
B) Turbine Gas Temperature (TGT)
C) Turbine Outlet Temperature (TOT)

Answer 12

A) Interstage Turbine Temperature (ITT)

Question 13

Which term refers to the temperature of gases as they leave the turbine section?
A) TIT
B) TGT
C) TOT

Answer 13

C) TOT

Question 14

What does Turbine Gas Temperature (TGT) generally represent?
A) The lowest recorded engine temperature
B) A general term used for turbine section gas temperatures
C) The fuel temperature in the turbine

Answer 14

B) A general term used for turbine section gas temperatures

Question 15

Where are thermocouples typically placed to provide a relative indication of turbine inlet temperature?
A) At the engine intake
B) At the turbine discharge
C) Inside the combustion chamber

Answer 15

B) At the turbine discharge

Question 16

Why is the turbine discharge temperature used to estimate turbine inlet temperature?
A) Because it is the hottest point in the engine
B) Because it is easier to measure and still provides a reliable relative indication
C) Because thermocouples cannot withstand high inlet temperatures

Answer 16

B) Because it is easier to measure and still provides a reliable relative indication

Question 17

Compared to the turbine inlet temperature, the turbine discharge temperature is:
A) Much higher
B) About the same
C) Much lower

Answer 17

C) Much lower

Question 18

What does the EGT indicator in the flight deck display?
A) The temperature of the engine oil
B) The highest temperature measured by a single thermocouple
C) The average temperature measured by the individual thermocouples

Answer 18

C) The average temperature measured by the individual thermocouples

Question 19

Why are multiple thermocouples used in turbine engines?
A) To detect vibration levels
B) To calculate average temperature more accurately
C) To control the speed of the turbine

Answer 19

B) To calculate average temperature more accurately

Question 20

Why are several thermocouples used to measure EGT, TIT, or similar parameters in a gas turbine engine?
A) To reduce engine noise
B) To improve temperature accuracy through multiple data points
C) To increase fuel efficiency

Answer 20

B) To improve temperature accuracy through multiple data points

Question 21

Which of the following parameters can be measured using thermocouples in a gas turbine engine?
A) Oil pressure
B) Turbine blade angle
C) Exhaust Gas Temperature (EGT)

Answer 21

C) Exhaust Gas Temperature (EGT)

Question 22

What is the purpose of the power off warning flag on the EGT indicator?
A) To show when engine temperature exceeds limits
B) To indicate the unit is not receiving power
C) To display temperature in Fahrenheit

Answer 22

B) To indicate the unit is not receiving power

Question 23

What is the temperature range displayed on the EGT indicator?
A) 0 °C to 900 °C
B) 0 °F to 1650 °F
C) 0 °C to 1200 °C

Answer 23

C) 0 °C to 1200 °C

Question 24

What does a TIT indicating system display?
A) The temperature of gases leaving the turbine
B) The temperature of gases entering the turbine
C) The average engine exhaust temperature

Answer 24

B) The temperature of gases entering the turbine

Question 25

What is the purpose of using dual thermocouples in a TIT system? A) To measure oil temperature and pressure B) To provide redundancy and signal separation C) To cool the turbine blades

Answer 25

B) To provide redundancy and signal separation

Question 26

How is the signal from one set of dual thermocouples used? A) To activate the ignition system B) To transmit signals to the fuel control unit C) To transmit signals to the flight deck indicator

Answer 26

C) To transmit signals to the flight deck indicator

Question 27

What is the purpose of the feedback potentiometer in the motor system? A) To measure fuel flow to the engine B) To generate a humming signal that stops the drive motor at the correct pointer position C) To regulate the exhaust gas temperature automatically

Answer 27

B) To generate a humming signal that stops the drive motor at the correct pointer position

Question 28

When does the over temperature warning light in the TIT indicator illuminate? A) When the turbine inlet temperature falls below a safe limit B) When the turbine inlet temperature reaches a predetermined high limit C) When the exhaust gas temperature drops suddenly

Answer 28

B) When the turbine inlet temperature reaches a predetermined high limit

Question 29

Engine indications are generally divided into which three groups? A) Pressure readings, temperature readings, and vibration analysis B) Performance indications, system indications, and engine trend monitoring C) Fuel flow, oil pressure, and exhaust gas temperature

Answer 29

B) Performance indications, system indications, and engine trend monitoring

Question 30

What types of displays are commonly used for engine indications on an Electronic Centralised Aircraft Monitoring (ECAM) system? A) Only digital readouts B) Only gauge-type analogue displays C) A combination of gauge-type analogue displays and digital readouts

Answer 30

C) A combination of gauge-type analogue displays and digital readouts

Question 31

Why can’t the thrust of a turbojet engine be measured directly? A) Because thrust is produced at the propelling nozzle, which is difficult to measure directly B) Because thrust is measured in horsepower instead of thrust units C) Because thrust is not related to engine power

Answer 31

A) Because thrust is produced at the propelling nozzle, which is difficult to measure directly

Question 32

What are the two common indications used to give an equivalent value of turbojet engine thrust? A) The rotational speed of the fan (N1) and Engine Pressure Ratio (EPR) B) Exhaust Gas Temperature (EGT) and Turbine Inlet Temperature (TIT) C) Fuel flow rate and oil pressure

Answer 32

A) The rotational speed of the fan (N1) and Engine Pressure Ratio (EPR)

Question 33

What is the primary purpose of secondary engine indications? A) To monitor engine thrust directly B) To monitor the correct operation of engine systems C) To measure fuel consumption

Answer 33

B) To monitor the correct operation of engine systems

Question 34

Which of the following conditions will cause a warning or caution to be displayed on the ECAM/EICAS page? A) Normal engine temperature B) A clogged filter C) Engine running at idle speed

Answer 34

B) A clogged filter

Question 35

What is the purpose of engine trend monitoring? A) To control the engine thrust during flight B) To alert the operator early about potential engine problems C) To display fuel consumption rates

Answer 35

B) To alert the operator early about potential engine problems

Question 36

Which of the following is NOT one of the three usual analyses performed in engine trend monitoring? A) Thermodynamic analysis B) Hydraulic pressure analysis C) Oil consumption analysis

Answer 36

B) Hydraulic pressure analysis

Question 37

What does the thermodynamic analysis in engine trend monitoring primarily check? A) Oil consumption levels B) Pressures and temperatures along the gas flow path C) Failures in the rotor system

Answer 37

B) Pressures and temperatures along the gas flow path

Question 38

The mechanic-dynamic analysis in engine trend monitoring is mainly used to check for: A) Oil consumption levels B) Failures in the rotor system C) Temperatures in the combustion chamber

Answer 38

B) Failures in the rotor system

Question 39

What does the Engine Pressure Ratio (EPR) indicator measure? A) The rotational speed of the turbine blades B) The ratio of turbine discharge pressure to ram air pressure at the engine inlet C) The temperature of gases entering the turbine

Answer 39

B) The ratio of turbine discharge pressure to ram air pressure at the engine inlet

Question 40

The EPR gauge is primarily used to indicate: A) Engine oil pressure B) Engine thrust being developed C) Engine fuel flow rate

Answer 40

B) Engine thrust being developed

Question 41

The Engine Pressure Ratio (EPR) compares: A) Compressor inlet and outlet temperatures B) Turbine discharge pressure and ram air pressure at the inlet C) Exhaust gas temperature and turbine inlet temperature

Answer 41

B) Turbine discharge pressure and ram air pressure at the inlet

Question 42

How is the Engine Pressure Ratio (EPR) determined? A) By measuring temperatures at the compressor and turbine exhaust B) By measuring pressures at the engine inlet and turbine exhaust using probes C) By measuring the rotational speed of the turbine blades

Answer 42

B) By measuring pressures at the engine inlet and turbine exhaust using probes

Question 43

What is the alternate method to limit engine thrust besides using EPR? A) Monitoring exhaust gas temperature B) Measuring compressor/fan speed known as N1 C) Monitoring fuel flow rate

Answer 43

B) Measuring compressor/fan speed known as N1

Question 44

Probes used to determine EPR are located at: A) The engine inlet and the turbine exhaust B) The combustion chamber and turbine inlet C) The fan blade tips and compressor outlet

Answer 44

A) The engine inlet and the turbine exhaust

Question 45

On the EPR display, what does the AMBER or RED line indicate? A) The current engine temperature B) The EPR for the maximum available thrust C) The fuel flow rate

Answer 45

B) The EPR for the maximum available thrust

Question 46

What does the BLUE circle on the EPR display represent? A) The EPR corresponding to the actual throttle position B) The engine oil pressure C) The average turbine temperature

Answer 46

A) The EPR corresponding to the actual throttle position

Question 47

Which color on the EPR display shows the maximum available thrust limit? A) Blue B) Green C) Amber or Red

Answer 47

C) Amber or Red

Question 48

What is the standard take-off thrust setting used on Airbus aircraft under normal conditions? A) TOGA (full thrust) B) FLEX (assumed temperature thrust reduction) C) Idle thrust

Answer 48

B) FLEX (assumed temperature thrust reduction)

Question 49

When is TOGA (full thrust) used instead of FLEX on Airbus aircraft? A) During routine flights on dry runways B) When departing from contaminated runways or with performance constraints C) For taxiing on the ground

Answer 49

B) When departing from contaminated runways or with performance constraints

Question 50

What term does Boeing use for the FLEX take-off thrust reduction? A) Thrust reserve B) Assumed temperature derate C) Power tapering

Answer 50

B) Assumed temperature derate

Question 51

What does the oil pressure indicator in a turbine engine usually show? A) Oil temperature B) Engine oil pump discharge pressure C) Oil consumption rate

Answer 51

B) Engine oil pump discharge pressure

Question 52

What happens if the oil temperature exceeds safe operating limits in a turbine engine? A) The engine automatically shuts down B) An over-temperature warning is triggered C) The oil pressure increases

Answer 52

B) An over-temperature warning is triggered

Question 53

Which types of warnings can be triggered by an oil over-temperature condition? A) Visual only B) Audible only C) Both visual and audible

Answer 53

C) Both visual and audible

Question 54

How does a strain gauge measure mechanical strain? A) By detecting changes in temperature B) By measuring proportional changes in electrical resistance C) By recording sound vibrations

Answer 54

B) By measuring proportional changes in electrical resistance

Question 55

What does a strain gauge detect on an object? A) Electrical current B) Mechanical strain or deformation C) Pressure changes

Answer 55

B) Mechanical strain or deformation

Question 56

What is the purpose of the additional pressure switch in the engine oil system? A) To increase oil flow B) To initiate a low oil pressure warning C) To regulate oil temperature

Answer 56

B) To initiate a low oil pressure warning

Question 57

What happens when the oil pressure decreases below the limit? A) The low oil pressure switch opens B) The low oil pressure switch closes and sends a signal to the flight warning computer C) The engine shuts down automatically

Answer 57

B) The low oil pressure switch closes and sends a signal to the flight warning computer

Question 58

Which system receives the signal from the low oil pressure switch when oil pressure is low? A) The fuel control system B) The flight warning computer C) The autopilot system

Answer 58

B) The flight warning computer

Question 59

What does the engine oil's ability to lubricate and cool depend on? A) The color of the oil only B) The temperature of the oil and the amount supplied to main components C) The speed of the engine only

Answer 59

B) The temperature of the oil and the amount supplied to main components

Question 60

Where is the oil inlet temperature measured? A) At the engine exhaust B) As the oil enters the oil pressure pump C) In the oil reservoir tank

Answer 60

B) As the oil enters the oil pressure pump

Question 61

What does the oil inlet temperature indicator show? A) The pressure of the oil B) The temperature of the oil entering the oil pressure pump C) The amount of oil remaining in the system

Answer 61

B) The temperature of the oil entering the oil pressure pump

Question 62

What is the most common type of oil temperature sensor used in aircraft engines? A) Pressure switch B) Resistance Temperature Detector (RTD) or Thermocouple C) Strain gauge

Answer 62

B) Resistance Temperature Detector (RTD) or Thermocouple

Question 63

The Resistance Temperature Detector (RTD) is used to detect what parameter in aircraft engines? A) Oil flow rate B) Oil temperature C) Oil pressure

Answer 63

B) Oil temperature

Question 64

Where is the low-pressure sensor usually positioned in most engines? A) Before the fuel pump B) After the outlet from the low-pressure filter C) Inside the fuel tank

Answer 64

B) After the outlet from the low-pressure filter

Question 65

What can cause low fuel pressure in an engine fuel system? A) Excessive fuel flow B) Cavitation caused by high fuel pump demand C) Fuel filter clogging only

Answer 65

B) Cavitation caused by high fuel pump demand

Question 66

What type of sensor is fitted across the fuel filter to monitor pressure differences? A) Temperature sensor B) Differential pressure sensor C) Flow sensor

Answer 66

B) Differential pressure sensor

Question 67

What are the two indications provided by the fuel flow indicating system? A) Engine oil pressure and temperature B) Actual fuel flow to the engines and fuel used since engine start C) Fuel pressure and fuel temperature

Answer 67

B) Actual fuel flow to the engines and fuel used since engine start

Question 68

What does the fuel flow indication allow the flight crew and maintenance to monitor? A) Engine oil consumption B) Performance and economic operation of the engines C) Exhaust gas temperature

Answer 68

B) Performance and economic operation of the engines

Question 69

Who typically performs the fuel flow calculations in modern systems? A) The flight engineer B) The FADEC system computer C) The cockpit crew

Answer 69

B) The FADEC system computer

Question 70

Where does the fuel flow transmitter measure the mass flow of fuel? A) Between the fuel pump and fuel tank B) Between the fuel control unit and the fuel nozzles C) After the fuel has exited the combustion chamber

Answer 70

B) Between the fuel control unit and the fuel nozzles

Question 71

Which types of fuel flow meters are commonly used today? A) Hydraulic and pneumatic B) Digital and analog C) Synchronous mass flow and motorless mass flow

Answer 71

C) Synchronous mass flow and motorless mass flow

Question 72

In a synchronous mass flow transmitter, what causes the turbine to turn? A) Electrical current B) Air pressure C) Fuel mass

Answer 72

C) Fuel mass

Question 73

What opposes the movement of the turbine in a synchronous mass flow transmitter? A) Gravity B) A spring C) Magnetic resistance

Answer 73

B) A spring

Question 74

What must happen to the fuel in order to measure force in a synchronous mass flow transmitter? A) It must be cooled B) It must be filtered C) It must be accelerated

Answer 74

C) It must be accelerated

Question 75

What is a key characteristic of modern motorless mass flow fuel transmitters? A) They require an external motor B) They do not need an electric motor or power supply C) They are powered by the aircraft's battery system

Answer 75

B) They do not need an electric motor or power supply

Question 76

Which component is not required in a motorless mass flow fuel transmitter? A) Fuel nozzle B) Electric motor C) Flow channel

Answer 76

B) Electric motor

Question 77

How are engine rotor speed indications expressed? A) In revolutions per minute (RPM) B) As a percentage of a 100% design speed C) In pounds per square inch (PSI)

Answer 77

B) As a percentage of a 100% design speed

Question 78

What are the three main parts of a rotor speed indication system? A) Sensor, filter, igniter B) Sensor, data transmission, indication C) Sensor, power supply, cooling fan

Answer 78

B) Sensor, data transmission, indication

Question 79

What are the two types of sensors used to measure rotor speed on engines? A) Thermocouple and strain gauge B) Tachometer generator and variable reluctance sensor C) Pressure sensor and RTD

Answer 79

B) Tachometer generator and variable reluctance sensor

Question 80

What principle does a variable reluctance sensor operate on? A) Electrical resistance B) Magnetic reluctance C) Thermal conductivity

Answer 80

B) Magnetic reluctance

Question 81

What component in the tachometer generator produces a signal proportional to N2 rotor speed? A) Variable reluctance sensor B) Permanent magnet C) Strain gauge

Answer 81

B) Permanent magnet

Question 82

What type of electrical signal does the tachometer generator produce? A) Direct current B) Single-phase AC voltage C) 3-phase AC voltage

Answer 82

C) 3-phase AC voltage

Question 83

What is the frequency of the voltage generated by the tachometer generator proportional to? A) Oil pressure B) Input speed C) Exhaust gas temperature

Answer 83

B) Input speed

Question 84

What type of voltage does the tachometer generator send to the FADEC computer? A) DC voltage B) Single-phase AC voltage C) 3-phase AC voltage

Answer 84

C) 3-phase AC voltage

Question 85

What is another name for the tachometer generator due to its additional function? A) Signal amplifier B) Control alternator C) Voltage regulator

Answer 85

B) Control alternator

Question 86

Which aircraft computer uses the speed signal from the tachometer generator? A) EICAS B) FADEC C) ECAM

Answer 86

B) FADEC

Question 87

Which of the following is not one of the three types of rotor speed indication? A) Digital-only numeric display B) Clock-type scale display C) Moving vertical bar display

Answer 87

A) Digital-only numeric display

Question 88

What type of rotor speed indication uses a traditional needle over a circular scale? A) Electromechanical indicator B) Clock-type scale display C) Moving vertical bar display

Answer 88

B) Clock-type scale display

Question 89

Which rotor speed indicator combines mechanical components with electrical signals? A) Moving vertical bar B) Digital LED display C) Electromechanical indicator

Answer 89

C) Electromechanical indicator

Question 90

What color is typically used to indicate the maximum permitted rotor speed on a speed indicator? A) Green B) Yellow C) Red

Answer 90

C) Red

Question 91

What is the purpose of the speed limit indication on the rotor speed display? A) To show the average rotor speed B) To protect the engine from overspeed C) To indicate the minimum rotor speed

Answer 91

B) To protect the engine from overspeed

Question 92

The red line on the rotor speed indicator represents: A) The idle speed B) The cruise speed C) The maximum permitted rotor speed

Answer 92

C) The maximum permitted rotor speed

Question 93

What happens if the engine speed exceeds the N1 redline limit on modern engines? A) The engine shuts down immediately B) The N1 speed and duration of the overspeed are recorded and reported by engine trend monitoring C) The engine speed is automatically reduced to idle

Answer 93

B) The N1 speed and duration of the overspeed are recorded and reported by engine trend monitoring

Question 94

What does the engine vibration indication help to identify? A) Fuel flow problems B) Rotor imbalance C) Oil temperature variations

Answer 94

B) Rotor imbalance

Question 95

What do the vibration sensors in an engine vibration monitoring system do? A) Measure fuel flow rate B) Deliver electrical signals to a computer C) Control engine speed

Answer 95

B) Deliver electrical signals to a computer

Question 96

What is the computer that collects and filters engine vibration data sometimes called? A) Electronic Control Unit (ECU) B) Engine Vibration Monitoring Unit (EVMU) C) Flight Control Computer (FCC)

Answer 96

B) Engine Vibration Monitoring Unit (EVMU)

Question 97

What type of sensors are used to measure engine vibration? A) Gyroscopes B) Accelerometers C) Thermocouples

Answer 97

B) Accelerometers

Question 98

How many vibration sensors are usually installed on each engine? A) One B) Two C) Three

Answer 98

B) Two

Question 99

Where is one of the vibration sensors typically located on a turbine engine? A) Near the fuel pump B) Near the N1 rotor shaft in the compressor area C) Inside the cockpit

Answer 99

B) Near the N1 rotor shaft in the compressor area

Question 100

What are the two common types of accelerometers used to measure engine vibration? A) Electromagnetic and piezoelectric-crystal types B) Magnetic and optical sensors C) Thermocouples and strain gauges

Answer 100

A) Electromagnetic and piezoelectric-crystal types

Question 101

What component does the electromagnetic vibration sensor have held in the center by two springs? A) A permanent magnet B) A rotating shaft C) A piezoelectric crystal

Answer 101

A) A permanent magnet

Question 102

What surrounds the permanent magnet in an electromagnetic vibration sensor? A) A fixed coil B) A spring mechanism C) A temperature sensor

Answer 102

A) A fixed coil

Question 103

What does a piezoelectric crystal generate when a force is applied to it? A) Current B) Voltage C) Resistance

Answer 103

B) Voltage

Question 104

What controls the vibration indication on modern aircraft? A) Pilot manual input B) Engine vibration monitoring unit C) Hydraulic system

Answer 104

B) Engine vibration monitoring unit

Question 105

What system on most modern aircraft helps to reduce engine vibration? A) Engine Cooling System B) Engine Balancing System C) Fuel Control System

Answer 105

B) Engine Balancing System

Question 106

What can the Engine Balancing System perform to correct high engine vibration? A) Fuel mixture adjustment B) Balance calculation C) Temperature regulation

Answer 106

B) Balance calculation

Question 107

What are systems that measure engine torque called? A) Speed Sensors B) Torque Meters C) Pressure Gauges

Answer 107

B) Torque Meters

Question 108

What components typically make up an electrical torque meter system? A) Torque meter assembly, phase detector, and indicator B) Speed sensor, pressure gauge, and display C) Thermocouple, amplifier, and warning light

Answer 108

A) Torque meter assembly, phase detector, and indicator

Question 109

What does the torque meter assembly consist of? A) Two concentric shafts, with twist in the inner shaft proportional to torque B) A single shaft with variable diameter C) Multiple gears measuring speed only

Answer 109

A) Two concentric shafts, with twist in the inner shaft proportional to torque

Question 110

What happens to the output shaft as torque is applied and increased? A) It shortens along its length B) It twists along its length C) It remains stationary

Answer 110

B) It twists along its length

Question 111

How is the torque meter operated? A) By engine oil pressure metered through a valve controlled by a helical ring gear B) By electrical signals from the rotor speed sensor C) By fuel flow rate adjustments

Answer 111

A) By engine oil pressure metered through a valve controlled by a helical ring gear

Question 112

What is the purpose of the power assurance test? A) To check that the engine can accelerate from idle to a given EPR value within a specific time and de-accelerate back to idle within a specific time period B) To measure the engine oil temperature during operation C) To verify the fuel flow rate at cruising altitude

Answer 112

A) To check that the engine can accelerate from idle to a given EPR value within a specific time and de-accelerate back to idle within a specific time period

Question 113

Before carrying out the power assurance test, where must the aircraft be positioned? A) In an engine run-up enclosure or dedicated engine run-up area, pointing into the wind with wheel chocks in place B) Anywhere on the apron, with the aircraft facing away from the wind C) At the gate with engines running at full power

Answer 113

A) In an engine run-up enclosure or dedicated engine run-up area, pointing into the wind with wheel chocks in place

Question 114

How long should the engine be operated at idle before starting the power assurance test? A) 2 minutes B) 5 minutes C) 10 minutes

Answer 114

B) 5 minutes

Question 115

What should the engine anti-ice and engine-bleed air switches be set to during the power assurance test? A) On B) Off C) No setting needed

Answer 115

B) Off

Question 116

How long should it take to increase engine speed from idle to maximum EPR during the test? A) 10 seconds B) 30 seconds C) 60 seconds

Answer 116

B) 30 seconds

Question 117

What is the maximum time allowed for the engine to accelerate to the required speed during the power assurance test? A) 5 seconds B) 7 seconds C) 10 seconds

Answer 117

B) 7 seconds

Question 118

After operating above 70% N1, how long should the engine be run at minimum idle before shutdown? A) 5 minutes B) 10 minutes C) 15 minutes

Answer 118

B) 10 minutes