Compressor
Describe indications of a compressor stall.
Depends on severity of the stall. Mild pulsation, aircraft vibration, loud bangs
What are the two types of electric current
Alternating current (AC) and direct current (DC)
The tendency of a fuel to vaporize refers to its:
Volatility
What is Pascal's Law
Pressure applied to an enclosed or confined liquid is transmitted equally in all directions without loss and acts with equal force on equal surfaces.
What are the different types of starters?
DC electric motor and air turbine
List the 4 mechanical malfunctions
1. Variable inlet guide vane and stator vane. 2.Fuel control Unit 3. Foreign Object Damage 4. Variable exhaust nozzle
Transformer rectifiers produce what type of electric current?
DC from an AC input
What type of fuel is used during shipboard operations? Why?
JP-5, it is less volatile and has a higher flashpoint.
What do hydraulic systems multiply?
Force.
Where would you fine the hottest air (high pressure or low pressure compressor)?
HIGH PRESSUREEEEEEEEE
Talk through relative wind and AOA in terms of compressors
Relative wind is formed by combining RPM and inlet airflow. AOA for the compressor is this relative wind and rotor blade's chord line. ANything that decreases inlet airflow or increases compressor RPM will increase AOA. Too high AOA can cause a stall
What provides a constant rotational input to the generator regardless of engine RPM?
Constant speed drive (CSD)
What part does the FCU play during engine starts?
Sends pressure signal to close the dump valve at engine start
What are the two types of power pumps used to generate fluid pressure in hydraulic systems?
Constant displacement and variable displacement pumps.
What is the most common type of large gas generator starter?
Air turbine starter
What automatically compensates for acceleration and deceleration schedules to help prevent stalls?
Fuel control unit
If equipped, what does an APU provide?
Emergency power on or power during ground operations
What cuts off fuel flow during engine shutdown
The FCU
Why is a relief valve included in a hydraulic system?
As a safety backup in case of over pressurization of the hydraulic system.
What type of igniter plugs are used in gas turbine engine ignition systems?
Annular gap and constrained gap
Describe airflow distortion
Most common cause of compressor stall. At high AOA. air entering inlet slows and becomes turbulent. If the the velocity of incoming air changes or the speed of rotor blades changes, AOA changes and may become excessive, increasing risk of compressor stall. Instances: Abrupt change in aircraft attitude, air turbulence, rapid throttle movement, deficiency of air velocity or volume.
Distribution of electrical energy is accomplished by a system?
Bus
What component measures the proper amount of fuel flow to the afterburner?
Afterburner fuel control unit
What is the purpose of the actuating cylinder?
Converts fluid energy into mechanical motion.
How many igniter plugs does each engine utilize?
2