15:10 Basic Lubrication Systems Flashcards
(39 cards)
What is the purpose of the lubrication system
To distribute oil to the engine bearing compartments and the gearboxes
What type of lubrication systems do most modern gas turbine engines use
A self contained dry sump lubrication system
The oil is recirculated through this system by pumps. The system keeps the oil in a fit condition to perform its tasks
What 4 subsystems does a basic lubrication system have
- An oil reservoir and supply system
- A scavenge system
- A vent system
- A monitoring system
What is the oil reservoir and supply system also called
The pressure oil system
What are the main components of the pressure oil system
- The oil tank
- The supply lines
- The supply pump
- The supply filter
Where is the oil stored
In the oil tank and pumped by the supply pump through the supply lines to the oil nozzles in the engine bearing compartments and the gearboxes
The oil is filtered before it reaches the nozzle
Where is the oil filter located
Downstream to the supply pump
What is the purpose of the scavenge system
It returns the oil from the bearing compartments and the gearboxes to the oil tank.
This prevents the accumulation of lubrication oil in the bearing compartments and gearbox
What is the purpose of the vent system
It releases air from the lubrication system to the atmosphere
How does the vent system release air to the atmosphere
Bearing compartments have a vent line to release the sealing air and maintain the airflow across the seals
Vent air leaves the shaft at the rear of the engine
What is the purpose of the oil monitoring system
The oil monitoring system measures and indicates oil quantity, oil pressure and oil temperature
What sensors does the oil monitoring system use
- The oil quantity sensor
- The oil pressure sensor
- The oil temperature sensor
- The low oil pressure switch
- The filter clogging switch
What is used to indicate a blocked filter
Mechanical clogging indicators are used to indicate a clogged filter when the engine is stopped. They are also called pop out indicators
Why would you need to check a magnetic chip detector
Contamination can be checked by checking filters and magnetic chip detectors
What is a magnetic chip detector
Small magnets which are in contact with the scavenge oil. They collect particles of magnetic metal which are passing through the oil
Where are magnetic chip indicators located
In the individual scavenge line for each sump. This makes it easy to isolate the source of contamination
The oil quantity transmitter in the tank sends the information via a computer , which performs the measurement. What is this called
The Engine Interface Unit (EIU)
Where is the oil quantity transmitter usually installed
At the top of the oil tank
This allowed the transmitter to be changed with out draining the tank
What two types of quantity transmitter are used
- The capacitance type transmitter
- The reed switch type transmitter
What is the oil pressure transmitter connected to
The oil supply line and to the oil tank vent line
The transmitter senses the pressure difference between the total oil pressure in the oil supply line and the vent pressure in the oil tank
What is the oil low pressure warning always accompanied by in the cockpit
An acoustic warning
Why would an additional pressure switch is also used in the engine oil system
To initiate a low oil pressure warning
What are the two different types of oil temperature sensor
- The thermocouple
- The thermistor
What is used to find out about internal wear of lubricated engine parts
Spectrometric Oil Analysis Program (SOAP) is used
