Power plant

Question 1

Which engine is installed?

Answer 1

IAE V2500-A5 (CEO)

CFM LEAP 1-A (NEO)

Question 2

What is the thrust output of the engine?

Answer 2

27.000 lbs

Question 3

What are the components of the LP stage?

Answer 3

CEO
- Single stage fan
- 4 stage LP compressor
- 5 stage LP turbine
NEO
- Single stage fan
- 3 stage LP compressor
- 7 stage LP turbine

Question 4

What are the components of the HP stage?

Answer 4

• 10 stage HP compressor

- 2 stage HP turbine

Question 5

Which rotor is connected to the accessory gearbox?

Answer 5

N2

Question 6

Which aircraft components are driven by the AGB?

Answer 6

• Engine driven hydraulic pump
• Engine generator
• Engine fuel pump
• Engine oil pump
• Air starter
• FADEC alternator

Question 7

How is the FADEC powered?

Answer 7

By aircraft power for 5 min on startup, then shutdown. Dedicated alternator >10% N2

Question 8

What are the three idle modes?

Answer 8

• Modulated idle (Minimum idle)
• Approach idle
• Reverse idle

Question 9

When is approach idle selected?

Answer 9

In flight with:

• Config 3 or Full
• Landing gear down

Question 10

How many igniters are used for automatic start?

Answer 10

One

Question 11

When will the ignition turn on/off in the automatic start sequence?

Answer 11

CEO
On - After dry crank sequence 
Off - 43% N2
NEO
On -  Approximately 20% N2
Off - 55% N2

Question 12

What is the effect on thrust of FADEC reverting to degraded N1 mode?

Answer 12

N1 is defined as a function of TLA only, overboost can occur.

Question 13

How many igniters are used for a manual start?

Answer 13

2

Question 14

When is ignition automatically selected on?

Answer 14

• Engine A/I on
• TO/GA or FLEX selected
• EIU failure
• Approach idle selected
• In flight sub-idle or surge
• Engine master switch cycled ON-OFF-ON

Question 15

At what engine speed will the start valve close?

Answer 15

43% N2

Question 16

What faults will the auto start system abort for?

Answer 16

CEO
- Hot start
- Hung start
- Stall
- Wet start
NEO
- Hot start
- Hung start
- Stall
- Wet start
- EGT overlimit
- Starter time exceeded
- Low start air pressure
- Failed bowed rotor protection
- TL not at idle
- Starter shaft shear

Question 17

What is the max EGT during starting?

Answer 17

635°C

Question 18

How are the thrust reversers actuated?

Answer 18

Hydraulically

Question 19

What is the maximum continuous oil temperature?

Answer 19

155°C

Question 20

What is the minimum oil temperature for start?

Answer 20

-40°C

Question 21

What is the max starter duty cycle?

Answer 21

CEO
- 1 cycle is one start attempt
- 15 second pause between cycles
- 30 minute cooling after three cycles
NEO
- 1 cycle is three start attempts
- 60 second pause between cycles
- 15 minute cooling after three cycles

Question 22

Will the manual start sequence be aborted by the FADEC for start faults?

Answer 22

No

Question 23

When do the pack valves close during the automatic start sequence?

Answer 23

When ENG MODE is selected to IGN/START

Question 24

When does the start valve open during the automatic start sequence?

Answer 24

When ENG MASTER switch is selected to ON

Question 25

What is the time limitation for operating with TOGA thrust?

Answer 25

2 engines - 5 minutes

1 engine - 10 minutes

Question 26

What is the minimum oil temperature for takeoff?

Answer 26

50°C