Powerplant For A220

Question 1

The A220 is powered by what?

Answer 1

Two Pratt & Whitney PW1500G series High-bypass turbofan engines. For Breeze: PW1524G. The 24 means 24,000 lbs

Question 2

N1 drives the high bypass engine fan through what?

Answer 2

fan drive gear system

Question 3

What does the Fan Drive Gear System mainly do?

Answer 3

Through a series of gears, reduces the fan speed to 1/3 of the N1 rotation. . This increases engine efficiency and allows both sections to operate at their optimum speeds.

Question 4

Two important functions of the engine fan?

Answer 4

1. Provides the first stage of air compression.

2. Generates approximately 80% of the total engine thrust.

Question 5

What provides constant de-icing for the inlet cone and cover?

Answer 5

Engine bleed air.

Question 6

What engine accessories are mounted on the main gearbox?

Answer 6

Question 7

How are the FADEC and the Electronic Engine Control(EEC) powered?

Answer 7

28VDC from the Permanent Magnet Alternator Generator(PMAG)

Question 8

What is the minimum power output that is required, for the PMAG, to power the EEC?

Answer 8

10% N2

Question 9

When the PMAG power is unavailable, what power automatically powers the FADEC and EEC?

Answer 9

DC ESS BUS

Question 10

What happens when the Starter Air Valve(SAV) is commanded open?

Answer 10

The Air Turbine Starter(ATS) rotates the N2 high-pressure shaft through the main gearbox.

Question 11

Describe the ATS, it’s functions, and what it provides air for!!

Answer 11

Question 12

How would One abort an engine start?

Answer 12

Setting the L or R ENG switch to OFF.

Question 13

Understand the Automatic Start Sequence:

Answer 13

Question 14

What does the EICAS message: ENG START DELAY mean?

Answer 14

Anytime an engine start is initiated outside of the envelope of the Altitude/Outside Air Temperature Graph, which is a motor time of 30 seconds.

Question 15

When starting engines what controls fuel flow?

Answer 15

L or R ENG switches.

Question 16

The ignition system

Answer 16

Question 17

How many heat exchangers are there for cooling the oil?

Answer 17

3.

Question 18

Oil system heat exchangers

Answer 18

Question 19

Which stages of the engine supply the Pneumatic services?

Answer 19

4th & 8th stages

Question 20

Bleed Air System:

Answer 20

Question 21

Thrust Reverser system:

Answer 21

Question 22

The EEC manages engine thrust by what?

Answer 22

Increasing or decreasing N1 corresponding to movements of the thrust levers.

Question 23

Thrust Limitation at Low Speed(TLLS)

Answer 23

Question 24

Thrust mode transitions:

Answer 24

Question 25

T/O Thrust modes:

Answer 25

Question 26

Climb thrust settings:

Answer 26

Question 27

Thrust modes:

Answer 27

Question 28

How much is each De-Rate selection of the previous higher thrust, and what is the minimum thrust on TO-3

Answer 28

1. 90% of the higher thrust. | 2. TO-3=17,000LBS

Question 29

APR activates under what conditions?

Answer 29

1. N1, 15% lower than other engine 2. Derange or Flex selected. 3. Thrust lever angle greater than 20 degrees

Question 30

FADEC will deactivate APR when:

Answer 30

- >400 feet RA - Successful inflight relight - Thrust selected to another thrust mode - APR set to DISARMED in the FMS.

Question 31

When is a 30 minute cooling period required?

Answer 31

After 3 engine start attempts, or 4 mins of continuous starter cranking.

Question 32

Do not engage starter on the ground if indicated N2 is above what?

Answer 32

20%

Question 33

Near idle for 3 mins prior to normal shutdown. Define near idle!!

Answer 33

Up to 40% N1.