M15.10 Lubrication Systems

Question 1

What is the main function of the lubrication system?

Answer 1

. Distributes oil to the engine bearing components and gear boxes

Question 2

What lubrication systems do most turbine engines use?

Answer 2

A self contained dry sump lubrication system

Question 3

What is the oil revisor and supply system also called?

Answer 3

. Pressure oil system

Question 4

Where is the supply filter located?

Answer 4

Downstream of the supply pump which removes any fod

Question 5

What does the supply filter prevent regarding the nozzle??

Answer 5

Prevents blockage of oil nozzle

Question 6

What is the purpose of the scavenged system??

Answer 6

. It’s part of the every day dry sumo lubrication system, and returns the oil from bearing compartments and gearboxes to oil tanks

Question 7

By having a scavenge system what does this prevent?

Answer 7

Accumulation of oil in bearings and gearboxes

Question 8

What does the vent system do?

Answer 8

Releases air from lubrication systems to the atmosphere

Question 9

How many scavenge pumps are there per line??

Answer 9

. One

Question 10

What does the oil monitoring system do?

Answer 10

Measures and indicates oil quantity, oil pressure and oil temperature

Question 11

What are the 5 different types of sensors??

Answer 11

. Oil quantity sensor
. Oil pressure sensor
. Oil temperature sensor
. Low oil pressure switch
. Filter clogging switch

Question 12

What do mechanical clogging indicators do?

Answer 12

. Indicate a clogged filter when the engine has stopped

Question 13

What is another name for mechanical clogging indicators?

Answer 13

Pop out indicators

Question 14

How can contamination be checked?

Answer 14

By inspecting filters and using magnetic chip detectors

Question 15

Where are magnetic chip detectors installed??

Answer 15

In individual scavenge lines of each sump which makes it easy to isolate source of contamination

Question 16

What is a main advantage of magnetic chip detectors in accordance to maintenance??

Answer 16

They are easily removed for inspection

Question 17

Where is the oil quantity transmitter installed??

Answer 17

At the top of the oil tank which allows the transmitter to be changed without draining the tank

Question 18

What are the two types of transmitters?

Answer 18

. Capacitance
. Reed switch type

Question 19

What is the oil pressure transmitter connected to??

Answer 19

. Oil supply line and to the oil tank vent oil line

Question 20

How does the oil pressure transmitter work?

Answer 20

. Senses pressure difference between total oil pressure in oil supply line and the vent pressure in oil tank

Question 21

What does the low oil pressure switch do??

Answer 21

If oil pressure deaconesses below the limit the switch closes and signal is sent to flight warning computer and appears in display unit cockpit.

Question 22

What are two types of oil temperature sensors?

Answer 22

. Thermocouple
. Thermistor

Question 23

The engine low oil pressure warning is always accompanied by what??

Answer 23

An acoustic warning in the cockpit

Question 24

What does SOAP stand for??

Answer 24

Spectrometric oil analysis program

Question 25

What is the function of SOAP??

Answer 25

. Find out about internal wear if lubricated engine components

Question 26

What size particles can SOAP find??

Answer 26

. Particles so small that can’t even be caught my oil filters . 0.001mm - 0.02mm

Question 27

When are oil samples taken for soap??

Answer 27

From the oil tank at regular intervals and sent to the laboratory for analysis

Question 28

What size particles does the scavenge system detect??

Answer 28

. Large particle sizes of more than 0.015mm

Question 29

What is the main problem with scavenge systems?

Answer 29

. The filter is not changed very often and filter inspection takes a lot of time

Question 30

Why are magnetic chip detectors better?

Answer 30

. Easier . less time consuming to get the condition of the oil content . Easily removed and checked

Question 31

Briefly what do magnetic chip detectors do?

Answer 31

. It catches metal particles which are attracted to the magnet.

Question 32

How does an electric magnetic chip detector work?

Answer 32

. The chip detector has two magnets at the tip . The restistanve between the two magnetic is monitored by the electronic control unit. . resistance decreases when particles connect with the magnet. . When resistance goes past a certain point the electronic control unit sends a message for post flight report.

Question 33

Where is the oil tank located?

Answer 33

. Above the level of the gearbox

Question 34

To prevent slow from the oil tank to the gear box due to siphon effect, what is in place?

Answer 34

. Anti- siphon device is fitted

Question 35

On engines without an anti- siphon device, what should you do?

Answer 35

. Check the oil quantity between 5-20 minutes after the engine is shut down when all the oil is in the tank

Question 36

Where can the oil quantity be checked

Answer 36

. At sight quages on the oil tanks . ECAM/ EICAS

Question 37

Where do you refill the oil?

Answer 37

. Via the oil tank filler port . You must wait 5 minutes after the engine is shut down before you can open the oil tank filler cap

Question 38

What are the two methods of oil refilling?

Answer 38

. Oil cans . Oil servicing system

Question 39

What type of system do oil cans use?

Answer 39

Gravity refuelling

Question 40

What type of system do oil servicing system use?

Answer 40

Pressure refilling

Question 41

What should you always ensure when topping up the oil?

Answer 41

. That it’s the correct type and the same manufacture

Question 42

What should you do regarding the tech log when refilling the oil?

Answer 42

. Enter the quantity of oil added

Question 43

What saftey precautions should you do when SOAP sampling?

Answer 43

. Use a new plastic bottle to prevent contamination . Wait at least 5 mins after engine is shut down . Wear gloves to protect your hands . Close the bottle and label it

Question 44

What is significant about a magnetic chip detector inspection?

Answer 44

. Maintenance staff must only check 1 engine detector and a cross check by a second mechanic to reduce working errors

Question 45

What are the two seals used in chip detectors?

Answer 45

. Reusable seal . O ring

Question 46

On some some magnetic chip detectors they have 2 O-rings, what needs to happen??

Answer 46

. The old O rings must be replaced with new ones to help prevent leakages