Leap-1A - 70-72

Question 1

What is the arrangement of the two spools?

Answer 1

4-10-2-7

Question 2

How many fan blades are there?

Answer 2

18

Question 3

What is the bypass ratio?

Answer 3

11:1

Question 4

When will an amber memo message show on the ECAM about incorrect closure of the fan cowl doors?

Answer 4

Any two of the three proximity switches are ‘far’

Question 5

What should be done if the T/R actuator red-pop pin is extended before releasing the T/R latches?

Answer 5

Connect the hand pump to dissipate the pressure

Question 6

At what windspeed must the thrust reverser doors not be opened?

Answer 6

Above 40 knots

Question 7

What specifically controls fuel during engine starting?

Answer 7

Pilot Metering Valve (PMV) within the Split Control Unit/Servo Valve Assembly (SCU/SVA)

Question 8

What is the path the fuel takes from the aircraft fuel tank to the Twin Annular Premixing Swirler (TAPS)?

Answer 8

Main fuel pump - IDG oil cooler - FMU - MHX - Main fuel pump - Main fuel filter - FMU - Fuel flow transmitter - SCU/SVA

Question 9

How many twin annular premixing swirlers are there?

Answer 9

19

Question 10

What is the purpose of the Pressure Sub-System (PSS) box?

Answer 10

Takes the analogue air inputs and converts them to digital signals for both of the two EECs to use when controlling the engine

Mounting point for the rating plug

Question 11

From what stage does the Start Bleed/Booster Anti-Ice valve bleed air from?

Answer 11

7th stage

Question 12

What is used to control the SB/BAI?

Answer 12

Servo fuel muscle

Question 13

What does the modulated turbine cooling system do?

Answer 13

Prevents HP turbine from distorting due to high temperatures by taking 10th stage HP Compressor Discharge Pressure (CDP) air flow and using it to cool the 1st stage HPT blades and roots via internal passages

Question 14

What does the Variable Bleed Valve (VBV) system do?

Answer 14

Controls the airflow leaving the LPC booster before it is fed into the HPC

Question 15

How many stages does the VSV actuation system control?

Answer 15

5 stages of HPC (technically IGVs are part of the LPC module and then the 4 stages of the HPC)

Question 16

What stage of air is bled in the Transient Bleed Valve (TBV) system?

Answer 16

10th stage HP compressor discharge air

Question 17

What is the throttle control lever angle range of movement?

Answer 17

-20° to +45°

Question 18

What are the main thrust monitoring and demand parameters?

Answer 18

Monitoring - N1 speed
Demand - Fuel flow

Question 19

How is draining and siphoning of the AGB by the MHX prevented?

Answer 19

NRV installed in the oil supply line between SFH and lubrication unit

Question 20

What is the purpose of the eductor valve?

Answer 20

Controls pressurisation of the ‘A’ sump at low engine speeds

Question 21

For what is cooling/lubricating oil provided?

Answer 21

• Three engine sumps, ‘A’, ‘B’ and ‘C’
• AGB
• IGB
• TGB

Question 22

What are located on the rear face of the lubrication unit?

Answer 22

A double and a triple strainer

Question 23

What does the oil debris monitoring system (ODMS) consist of?

Answer 23

• Oil separator
• ODM sensor
• ODM signal conditioner unit

Question 24

What is the failsafe position of the two nacelle anti-ice valves?

Answer 24

Open

Question 25

What is the difference between the NEO hot air leak detection system and the CEO?

Answer 25

Pylon is a double loop

Question 26

What is the purpose of the fan cowl strake?

Answer 26

Prevents turbulent airflow at the engine/wing interface

Question 27

What does the Central Ventilation Tube (CVT) do?

Answer 27

Ventilates 'A' sump

Question 28

Which engine mount transmits thrust?

Answer 28

FWD

Question 29

What is the ground start, air start and maximum limit for EGT?

Answer 29

Ground start - 750°C Air start - 875°C Maximum - 1060°C

Question 30

How many borescope ports are there?

Answer 30

26

Question 31

Which borescope ports are not fitted with self-locking plugs?

Answer 31

A and B

Question 32

What are the major modules?

Answer 32

* Fan & booster * Core * LPT

Question 33

Which bearings support N1?

Answer 33

#1, #2 and #5

Question 34

Which bearings support N2?

Answer 34

#3B, #3R and #4

Question 35

What bearings are in the 'A' sump?

Answer 35

* #1 - roller * #2 - ball * #3B - ball * #3R - roller

Question 36

What bearings are in the 'B' sump?

Answer 36

#4 - roller

Question 37

What bearings are in the 'C' sump?

Answer 37

#5 - roller

Question 38

Which bearing is ceramic?

Answer 38

#3B

Question 39

How much thrust comes from the bypass secondary airflow?

Answer 39

90%

Question 40

What does a dimple on the platform front shroud indicate?

Answer 40

The position of blade #1

Question 41

At what position on the fan frame module is the #6 strut?

Answer 41

8 o'clock position

Question 42

Fan blade weights are fitted to which component?

Answer 42

Platform front shroud

Question 43

Where is the oil tank located?

Answer 43

Right side fan case

Question 44

How many VBVs are fitted?

Answer 44

8

Question 45

Where do customer bleeds come from in the HPC?

Answer 45

4th and 10th stage

Question 46

What can be said about the construction of the first 5 stages of the HPC?

Answer 46

BLISK (blade and disk) design

Question 47

Which stage is made of an Inconel alloy in the HPC?

Answer 47

Stage 5

Question 48

To what component are the 8 EGT T48 sensors fitted?

Answer 48

Turbine Centre Frame (TCF)

Question 49

Which components on the gearbox use carbon rotating seals?

Answer 49

* Engine driven pump * Manual crank pad * IDG * Main fuel pump