M15.14 Engine Indication Systems

Question 1

Why do we require exhaust gas temperature (EGT) indication?

Answer 1

To monitor temps experienced by the turbine engines to prevent thermal damage and indicate when a limit is exceeded

Question 2

What is the temperature called where the hot gas hits the high pressure turbine?

Answer 2

Turbine inlet temperature (TIT)

Question 3

What is the temperature called where the hot gas hits the high pressure turbine?

Answer 3

Turbine inlet temperature (TIT)

Question 4

Where is the exhaust gas temperature indicator?

Answer 4

In the flight deck

Question 5

What temperature does the EGT show?

Answer 5

The average temperatures measured by the individual thermocouples

Question 6

The EGT indicator is in what type of unit?

Answer 6

Hermetically sealed unit

Question 7

What do the sets of thermocouples do for the TIT?

Answer 7

One set is paralleled to transmit signals to the flight deck indicator
The other set provides temperature signals to engine monitoring and control systems

Question 8

Three groups of engine indications?

Answer 8

Performance indications
System indications
Engine trend monitoring

Question 9

What are system indications?

Answer 9

Also called secondary indications
Used to monitor the operation of engine systems such as oil and fuel
Detect malfunctions quickly

Question 10

What is engine trend monitoring?

Answer 10

Uses engine parameters that are automatically recorded by the aircraft condition monitoring system (ACMS)

Question 11

What two values are used to measure thrust?

Answer 11

The rotational speed of the fan (N1)
The engine pressure ratio (EPR)

Question 12

The engine system indications monitor what systems?

Answer 12

Oil quantity
Oil pressure
Oil temperature

Question 13

What type of warnings would appear on ECAM detected by the engine system indications?

Answer 13

When an indication exceeds a limit
When the system detects low pressure
When a filter becomes clogged
When an unlocked thrust reverser is detected

Question 14

Three types of engine trend monitoring analysis?

Answer 14

The thermodynamic analysis
The mechanic- dynamic analysis
The oil consumption analysis

Question 15

The engine pressure ratio (EPR) indicator gauge compares what?

Answer 15

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

Question 16

How is EPR determined?

Answer 16

Pressure measurements taken by probe installed in engine inlet and turbine exhaust

Question 17

Two displays on EPR display?

Answer 17

Amber or red line that shows maximum available thrust
Blue line that shows the actual throttle position

Question 18

What is FLEX?

Answer 18

An Airbus setting for the standard take off thrust setting.
Used to preserve engine wear and prolong engine life

Question 19

Two main types of oil pressure transmitters?

Answer 19

The bourdon tube type
The strain gauge type

Question 20

Strain gauges are often used in what type of circuit?

Answer 20

Wheatstone bridge circuit

Question 21

If the oil pressure decreases below a limit what does the low oil pressure switch do?

Answer 21

The switch closes and a signal is sent to the flight warming computer and a warning message appears on the display unit in the flight deck

Question 22

An oil inlet temperature indicator is used to indicate what?

Answer 22

Indicates the temperature of the oil as it enters the oil pressure pump

Question 23

How does the oil temperature sensor work?

Answer 23

Designed to respond to changes in temperature and convert them into an electrical signal

Question 24

Does fuel pressure require a warning if it falls outside normal operating range?

Answer 24

Yes

Question 25

The fuel flow indicating system provides what two different indications to the flight crew?

Answer 25

The actual fuel flow to the engines The fuel used since the engine was started

Question 26

3 parts of rotor speed indication?

Answer 26

The sensor The data transmission The indication

Question 27

Two types of sensors to measure rotor speed on engines?

Answer 27

Variable reluctance type sensor Tachometer generator type- located in gearbox

Question 28

What is a tachometer generator?

Answer 28

Has a permanent magnet that is driven by the gearbox Driven at a speed proportional to the n2 rotor speed.

Question 29

Where does the tachometer generator send the 3 phase AC voltage to?

Answer 29

FADEC computer

Question 30

Three types of rotor speed indications?

Answer 30

Display with clock type scale Display with moving vertical bar The classical electromechanical indicator

Question 31

On modern engines, if the engine speed exceeds the n1 redline, what happens?

Answer 31

The duration of the overspeed and the speed are recorded and reported to the engine trend monitoring

Question 32

Main parts of engine vibration monitoring system?

Answer 32

The indication in the flight deck shows the level of vibration One or two vibration sensors Computer collects and filters vibration data for indication and trend monitoring

Question 33

What are the engine vibration sensors?

Answer 33

Accelerometers that measure radial acceleration of the rotor system

Question 34

Where are the two engine vibration sensors located on the engine?

Answer 34

One in the compressor area, near the N1 shaft Second sensor is in the turbine area

Question 35

Two types of accelerometers?

Answer 35

Electromagnetic accelerometer Piezoelectric crystal type sensor

Question 36

What is vibration indication on modern aircraft automatically controlled by?

Answer 36

The engine vibration monitoring unit

Question 37

A typical electrical torque meter system consists of what?

Answer 37

A torque meter assembly, a phase director and an indicator