Chapter 9: Lubrication System Flashcards
purpose of engine lubrication
1) lubricate mating parts
2) cleaning of moving parts
3) cooling of hot parts
4) oil damping
requirements of aviation lubricants
1) low volatility to reduce evaporation
2) anti-forming (no bubbles)
3) high flash point
4) wide temperature range
5) excellent film strength qualities
6) high viscosity index
what is wet sump lubrication system?
parts lubricated are immersed partially or fully in bath of oil
why is wet sump lubrication system not good?
large amount of oil needed and space
what does the dry sump lubrication subsystem consist of?
pressure, scavenge and breather vent
what does the breather vent do in dry sump lubrication system?
separate oil from air oil mist due to evaporation
how does dry sump lubrication system work?
oil is supplied to parts by pressure pump and returns to tank by scavenge pump
which type of lubrication system is used in modern engines?
dry sump lubrication system
what is a full flow type oil system?
achieves desired oil flow rate through dispensing oil based on max RPM
components in a oil system
1) oil tank
2) pressure & scavenge pumps
3) pressure relieve valve
4) FOHE
5) AOHE
6) deoiler
7) MCD
8) filter
modern gas turbine engine utilises which type of oil for lubrication?
synthetic oil
how can oil quantity be checked?
oil sight glass & LED screen on cockpit panel
what 2 parameters will cause immediate engine shutdown?
low oil pressure & high oil temperature
when should servicing of oil be done?
within a short time after engine shut down
