Engine Indication Flashcards
What are performance indicators
Monitor performance limits on engines and set thrust flight phases
What are system indicators
Monitor operation of engine systems such as oil or fuel
Detect malfunctions
What is engine trend monitoring
Done on ground to detect engine problems at every stage
What does an engine trend monitoring system use
Parameter’s automatically recorded by Acms
Is it possible to measure thrust directly
No
2 ways we find the value of thrust
Rotational speed of fan (N1)
Engine pressure ratio
What do engine system indicators do
Monitor correct operation of engine systems
What do the indications for oil system monitor
Oil quantity , oil pressure and oil temperature
Where are warnings and cautions showed
Displayed on ECAM/EICAS
How is engine trend monitoring showed
ACMS provides print-out for cockpit printer
Transmit the data via ACARS
What does thermodynamic analysis check
Pressured and temps along gas flow path
What failures does mechanic dynamic check
Failures in rotor system , does this by checking vibration and rotor speed signals
What does the oil consumption analysis do
Generates signal when oil consumption reaches a certain level
What’s the N1 indication
Low pressure rotor
N2 indication
High pressure rotor
N3 indication
Engine has 3 rotors
How are engine rotor speed indications expressed
Percentage of 100% design speed
Speed indication parts
Sensor
Data transmission
Indication
3 parts of epr indication
Indicator in cockpit
Computer
Two pressure pickups connected by tubes with computer
Max EGT indications
600-900 degrees C
Where is highest EGT temp
Directly behind combustion chamber
Turbine inlet temperature
Higher then 1400 degrees C
Why is EGT measured from colder location
turbine inlet temperature can be too hot
What gears are in a hydraulic torque meter
Sun and planet gears in epicyclic gear assembly
What do helical cut teeth do in a hydraulic torque meter
Transmit increasing axial thrust
Where are two concentric shafts in electronic torque meter
Between engines & gear box
What does the inner shaft do in electronic torque meter
Powers transmitting shaft
Where is outer shaft connected to in electronic torque meter
Attached to inner shaft at rear end
What’s the 3 clock types
Clock type scale
Moving vertical bar
Electromechanical indicator
What do the clock type indicators do
Show EGT in degrees C in analog and digital
What is a red line
Max EGT that shouldn’t be exceeded
What is amber line
Max EGT for max continuous thrust setting , can only be exceeded during take off and go around thrust
What is the relationship between EGT AND TIT
Direct relations
What indication is vibration
Secondary indication
How does the cockpit show vibration
Vibration level in Units 0-6
What is EVMU
Engine vibration monitoring unit aka the computer
What’s component is a vibration sensor
Accelerometer that measures radial acceleration of rotor system
Where are the two vibration sensors
One in compressor
Seconds in turbine area
How is vibration indication controlled
Automatically by monitoring unit
How does ECAM generate 2 indications
From single sensor
What happens when fwd sensor fails on ECAM
Switches to aft
How many modes of indication does EICAS use
4 modes
What is BB
broadband which is a unfiltered vibration signal
How is actual fuel flow measured (unit)
Kg or tons per hour
How is fuel used since engine started measured
Kg or tons
What generates fuel flow and fuel used
Fuel flow transmitter
What does a fuel flow transmitter do
Measures mass flow of fuel between control unit and fuel nozzles
How does fuel flow transmitter get its force measurement
Acceleration of fuel done by an impeller
Two types of oil quantity transmitter
Capacitance and reed switch
Where is oil pressure transmitter connected to
Oil supply line & oil tank vent line
Two types of oil pressure sensor
Bourbon tube and strain gauge
What is engine low oil pressure warning accompanied with
Acoustic warning
Two types of oil temperature sensor
Thermo couple
Thermistor
Where is oil temperature sensor found
Scavenge system
What does scavenge system check
Hot oil temperature upstream of oil cooler
What does pressure system check
Temperature of cooled oil
What is soap
spectrometric oil analysis program
What size particles does soap find
0.001-0.02mm
