Power Plant and Ignition

Question 1

How many spools are there and how are they designated?

Answer 1

twin spool (2), LP and HP

N1 N2

Question 2

What does each spool drive?

Answer 2

LP Spool: singe fan, 3 stage intermediate pressure compressor, 3 stage LP turbine

HP Spool: 12 stage HP compressor, 2 stage HP turbine

Question 3

What does the starter drive?

Answer 3

HP spool

Question 4

What does the combustion section consists of?

Answer 4

10 interconnected liners with a fuel spray in each.

2 igniter plugs on 4 and 8 are installed. on each engine.

Question 5

How is the airflow split up as it passes through the engine?

Answer 5

3 to 1 by pass ratio

Question 6

What could cause an engine overheat alert?

Answer 6

if temp of the cooling airflow exceeds a preset value

Question 7

where is bleed air tapped from?

Answer 7

2 from HP. 7 and 12 compressor.

Question 8

How is engine oil cooled?

Answer 8

fuel cooled oil cooler and filter.

Question 9

How is IDG oil cooled?

Answer 9

passing it through a primary air cooled oil cooler located in the rear by pass duct. secondarily through a fuel cooled oil cooler

Question 10

How is engine and IDG oil shared?

Answer 10

it cant

Question 11

Where is starting air derived from?

Answer 11

APU, a ground supply unit or cross bleed from a running engine

Question 12

Describe an engine start?

Answer 12

air is admitted to the starter motor when the electrically operated starter valve is open, when enegine selector is selected. the starter system is electrically armed and disarmed via the START pb. both fuel and ignition are applied when the respective fuel lover is opened. the starter motor rotates the HP shaft.
At47% starter cutout occurs. valve closes. if it doesn’t close a alert will be presented.

Question 13

When should light up occur on starting?

Answer 13

after fuel introduction 20secs max

Question 14

What are the starter limits?

Answer 14

4 attempts, max 2 mins, 30 seconds between. after 4, wait 15mins

Question 15

What can you do if a starter valve doesn’t open?

Answer 15

Can be manually opened

Question 16

What igniter plugs are active (and when) with the ignition selector in CONT 1 CONT 2 AUTO and relight?

Answer 16

cont 1, igniter 1 continuously
cont 2 igniter 2 continuously
Auto. igniter 1 , during start and when at 50kts wheel spin or reverse
relight, both continuously

Question 17

How is ice prevented from forming in the engine fuel system?

Answer 17

via the fuel cooled oil cooler (heats the fuel)

Question 18

What lever controls the HP fuel valve and what are its positions?

Answer 18

fuel lever. 2 positions. open and close.

Question 19

By what means may the thrust levers be operated?

Answer 19

manually or ATS

Question 20

What effect has the flight control lock on the thrust lever movement?

Answer 20

prevents selection of take off thrust with lock engaged, to approx 80% N2.

Question 21

What thrust ratings may be selected on the TRP?

Answer 21

TOGA, FLX, CLB, CRZ, MCT

Question 22

How do you set an assumed temperature for FLX?

Answer 22

by rotating the TEMP selector on TRP

Question 23

What do you need to do to set EPR manually? (FLX)

Answer 23

same as temp y MAN EPR selector

Question 24

How are thrust reverses actuated?

Answer 24

hydraulic system 1

Question 25

How do you know reversers are operating?

Answer 25

a Green R is displayed at top of EPR tape.

Question 26

Can thrust reversers be used before touch down?

Answer 26

no, on ground only

Question 27

What happens if a reverser deploys inadvertently?

Answer 27

the corresponding thrust lever automatically retards to idle. REVERSER ENG 1 / 2 alert2

Question 28

Where are engine indications are normally presented?

Answer 28

Primary page MFDU and secondary ENG page

Question 29

What parameters does the EFSU look at?

Answer 29

Looks at thrust lever position and N1 to compare. Engine failure sensing unit. rapid loss of thrust

Question 30

What is the SEI an when can it be used?

Answer 30

standby engine indicator. directly connected to the engines. can be used anytime with on of switch.

Question 31

If only one MFDU is operating, how do you get the secondary page up?

Answer 31

XFR on MFDS panel

Question 32

How is vibration indicated?

Answer 32

on secondary MFDS page, vib. outer N1, inner N2.

Question 33

What do the normal and alternate vibration sensors monitor?

Answer 33

the engine spools.