Engines day 4

Question 1

How many N1 speed sensors are there?

Answer 1

Two. One sensor and the alternator

Question 2

What measures the gas generator rotating speed?

Answer 2

The N1 sensors

Question 3

Where are the N2 sensors located?

Answer 3

in the reduction gearbox

Question 4

What is the purpose of the engine indicating system?

Answer 4

to be sure that the engines are operating in the proper limits

Question 5

How many N2 speed sensors per engine?

Answer 5

3

Question 6

What measures the power turbine rotation speed?

Answer 6

the N2 sensors

Question 7

Where are the N1 sensors located?

Answer 7

on the alternator driveshaft

Question 8

Which are the main components of the torque meter?

Answer 8

a reference shaft, output shaft, phonic wheel

Question 9

What is the temperture of the combustion gases on the exhaust system?

Answer 9

660 C

Question 10

What is the function of the exhaust system>

Answer 10

The exhaust system continuous the expansion phase of the engines gas cycle and expels the gases overboard to atmosphere

Question 11

What is the function of the heat sheild in the exhaust system?

Answer 11

One to protect the battery, one to protect the gearbox.

Question 12

How many strainers in each of the oil systems?

Answer 12

3. One per scavenge line.

Question 13

What is the purpose of the check valve in the oil system?

Answer 13

to prevent the oil going from the cooler to the engine

Question 14

What is the oil consumption of the Arrial 2E?

Answer 14

0.1-0.2L per hour

Question 15

How many oil pumps are on each engine?

Answer 15

4. 1 Px, 3 scavange.

Question 16

Where are the engine oil pumps driven from?

Answer 16

the N1 drive

Question 17

What are the external oil pipes made from?

Answer 17

stainless steel

Question 18

Where is the oil check valve located?

Answer 18

downstream of the scavenge pumps

Question 19

If the engine is stopped, what position is the oil check valve in?

Answer 19

closed

Question 20

What is the function of the oil strainers?

Answer 20

to protect the scavange pumps from large particles of metal

Question 21

The oil filter pre-blockage indication will be visable when?

Answer 21

on the FND on the ground

Question 22

If a filter blockage was detected, what indication would be given?

Answer 22

an amber caution

Question 23

Where is the starter electro valve installed?

Answer 23

the engine

Question 24

Where is the starter generator installed?

Answer 24

on the engine

Question 25

When will the starter/generator move into generator mode?

Answer 25

at 61% N1

Question 26

What are the functions of the starting system?

Answer 26

starting ventilation, ignition & overheat protection

Question 27

What indication will a starter overheat give?

Answer 27

an amber caution

Question 28

at the end of the start, what speed is acheived for idle?

Answer 28

78% N2

Question 29

When N1 reaches 61%, what happens at the starter generator?

Answer 29

the starter contactor opens, cutting electrical supply to the starter gernerator and the starter generator starts to operate in generator mode.

Question 30

Where is the EDR powered from?

Answer 30

the aircraft electrical system

Question 31

Can an EDR be swapped with a different engine?

Answer 31

No, it must stay with it’s engine over it’s entire service life

Question 32

What is the exhuast pipe made from?

Answer 32

stainless steel

Question 33

What type of sump is the engine?

Answer 33

a dry sump laid out for synthetic oil

Question 34

What is the volume of oil the oil tank can hold?

Answer 34

5.5litres

Question 35

What speed is the ignition relay de-energised?

Answer 35

30% N1

Question 36

What controls the starter and generator modes?

Answer 36

the GCU