15.10 Lubrication Systems

Question 1

What is the function of the lubrication system?

Answer 1

-distribute oil to bearing compartments and gearboxes

Question 2

What types of sump pumps can be used?

Answer 2

Wet and dry

Question 3

How does a dry pump differ?

Answer 3

They use an external supply tank

Question 4

Does the full flow system have the ability to regulate oil pressure?

Answer 4

No

Question 5

What influences oil pressure?

Answer 5

Temperature due to Low viscosity

Question 6

What drives the supply pump?

Answer 6

The N2 rotor system via the gearbox

Question 7

What will leakage in the oil system lead to in a full flow system?

Answer 7

Increase in total flow area and decrease in oil pressure

Question 8

The pressure relief valve installed between the delivery side and suction side serves what function in a full flow system?

Answer 8

Stopping too excessive pressure

Question 9

What is the difference with a constant pressure system?

Answer 9

AKA regulated pressure system
It has a pressure regulating valve which holds pressure regardless of idle or max speed on the N2 rotor

Question 10

What are the disadvantage of full flow system?

Answer 10

-The system requires a relatively high oil pressure when engines are idle leading to very high pressure at higher speeds
-a significant rise in oil temperature will occur after a power reduction

Question 11

What are the advantages of the full flow system?

Answer 11

It is simple and requires little maintenance

Question 12

In the exhaust turbine bearing what methods are used to cool and why is it critical?

Answer 12

-Air and oil in some cases
The oil is usually passed through a cooler
-High heat

Question 13

What is the oil container constructed from?

Answer 13

Aluminium allow and silicone for fire resistance

Question 14

What are the two ways to fill oil?

Answer 14

Gravity and pressure

Question 15

What are the key components of an oil tank?

Answer 15

-Check valve to prevent spills
-Scupper to catch spills and drain overboard
-Strainer

Question 16

What are the most common types of oil pump?

Answer 16

Gear (most common)
Gerotor

Question 17

How can capacity be altered on a gerotor pump?

Answer 17

Varied size of the elements

Question 18

Where is the pressure regulating valve located?

Answer 18

In the pressure side

Question 19

When are oil pressure relief valves especially important?

Answer 19

When there is a cooler in the system

Question 20

Where is the last chance filter located?

Answer 20

Before each nozzle

Question 21

What are the two types of oil cooler?

Answer 21

Fuel and air

Question 22

What is a hot tank system?

Answer 22

When the cooler is in the the supply line

Question 23

What is the function of the breather?

Answer 23

Removes air from scavenge oil through a de aerator

Question 24

What are the two types of monitoring system transmitters?

Answer 24

Capacitance and reed switch

Question 25

what is the principle of the capacitance types transmitter?

Answer 25

It detects capacitance change

Question 26

What is the principle of the reed type transmitter?

Answer 26

A metal tube with a float the oil is allowed in and out, the float closes the nearest switch

Question 27

Magnetic chip detectors have which two types?

Answer 27

Electronic monitored and non electronic monitored

Question 28

What is the function of the magnetic chip detector?

Answer 28

Collects magnetic debris from components for monitoring

Question 29

What is SOAP spectrometric oil analysis?

Answer 29

-used to catch smaller particles 0.001mm - 0.002mm
-oil is sent to a laboratory for analysis

Question 30

How can oil quantity be checked?

Answer 30

-sight gauges
-ecam/eicas

Question 31

When must an oil level be checked with 5-20 mins?

Answer 31

When an anti syphon device is not fitted