Chapter 9 - Air Intakes and EAPS

Question 1

What is the chamber for the air intake and its material?

Answer 1

Plenum chamber made of titanium and carbon fibre materials

Question 2

What is the EAPS purpose?

Answer 2

To protects the turbine blades and compressor inlet from particles

Question 3

What supplys the EAPS with electrical poower?

Answer 3

Ess 28VDC bus 1-1 2-2

Question 4

What components of the EAPS remove the particles?

Answer 4

Centrisep inertial clearner tube which contains a vortex tube, vortex generator and outlet tube.

Question 5

How are the perticles removed?

Answer 5

Via an ejector (with bleed P3 air) to exhaust the particles overboard

Question 6

What 5 components make up the EAPS?

Answer 6

Particle separator
Shut-off valves
Pressure switches
Tubing
Doors for the aux air intakes

Question 7

What does the pressure switch for the EAPS do?

Answer 7

Verify the correct functioning of the valve

Question 8

When cant the EAPS be used?

Answer 8

Engine has not reached ‘IDLE’ condition
OEI condition (In AUTO)
Landing gear retracted (In AUTO)

Question 9

When can the EAPS be used?

Answer 9

AEO condition (In AUTO)
Landing gear extended (In AUTO)

Question 10

Where are the EAPS switches and what do the switch positions mean?

Answer 10

OFF: Particle separator is off
ON: Particle separator is activated
AUTO: ON when Landing gear extended and OFF when Landing gear retracted

Question 11

How much does EAPS reduce airflow to the engine?

Answer 11

10%

Question 12

What does ‘#1/2 EAPS ON’ advisory mean?

Answer 12

The EAPS are on

Question 13

What does ‘#1/2 EAPS PRESS’ caution mean?

Answer 13

When ‘ON’ The pressure switch detects no pressure
or
‘OFF’ The pressure switch and pressure is detected
Therefore the pressure switch is detecting a failure of the shut-off valve