Chapter 9: Lubrication System Flashcards

1
Q

purpose of engine lubrication

A

1) lubricate mating parts
2) cleaning of moving parts
3) cooling of hot parts
4) oil damping

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2
Q

requirements of aviation lubricants

A

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

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3
Q

what is wet sump lubrication system?

A

parts lubricated are immersed partially or fully in bath of oil

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4
Q

why is wet sump lubrication system not good?

A

large amount of oil needed and space

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5
Q

what does the dry sump lubrication subsystem consist of?

A

pressure, scavenge and breather vent

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6
Q

what does the breather vent do in dry sump lubrication system?

A

separate oil from air oil mist due to evaporation

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7
Q

how does dry sump lubrication system work?

A

oil is supplied to parts by pressure pump and returns to tank by scavenge pump

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8
Q

which type of lubrication system is used in modern engines?

A

dry sump lubrication system

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9
Q

what is a full flow type oil system?

A

achieves desired oil flow rate through dispensing oil based on max RPM

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10
Q

components in a oil system

A

1) oil tank
2) pressure & scavenge pumps
3) pressure relieve valve
4) FOHE
5) AOHE
6) deoiler
7) MCD
8) filter

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11
Q

modern gas turbine engine utilises which type of oil for lubrication?

A

synthetic oil

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12
Q

how can oil quantity be checked?

A

oil sight glass & LED screen on cockpit panel

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13
Q

what 2 parameters will cause immediate engine shutdown?

A

low oil pressure & high oil temperature

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14
Q

when should servicing of oil be done?

A

within a short time after engine shut down

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