APU

Question 0

The APU supplies pneumatic power for:

Answer 0

Main engine Starts and Air Conditioning

Question 1

The APU is equipped with a:

Answer 1

40 KVA generator

Question 2

The APU ECU controls the APU during:

Answer 2

All phases of operation

Question 3

The APU control system ensures priority is given to:

Answer 3

Electric loads

Question 4

Pressurized fuel is supplied to the APU by the:

Answer 4

APU fuel pump

Question 5

APU RPM is displayed on the

Answer 5

EICAS status page

Question 6

APU “AVAIL” will illuminate at

Answer 6

99% RPM and two seconds later

Question 7

The APU gauges ( RPM and EGT ) appear on EICAS when

Answer 7

APU POWER/FUEL switch/light is pressed in

Question 8

“APU overspeed “ warning message is displayed when RPM exceeds

Answer 8

106%

Question 9

Where is the APU located?

Answer 9

Tail cone

Question 10

What is the purpose of the internal bypass valve

Answer 10

Allows the APU to continue to run if APU pump fails

Question 11

APU rpm is displayed on the

Answer 11

EICAS status page

Question 12

APU Bleed air is controlled by modulating

Answer 12

APU LVC

Question 13

APU bleed pressure read out can be monitored on

Answer 13

EICAS “ECS” Synoptics page

Question 14

APU intake door is located

Answer 14

Upper right hand side of aircraft

Question 15

APU secondary function(s)

Answer 15

Supplies bleed air for air conditioning

Supplies air for main and engine starting

Question 16

If APU door is open or unknown position airspeed is restricted to

Answer 16

220 KIAS

Question 17

What is the max operating altitude for the APU?

Answer 17

41,000 feet

Question 18

APU intake door is located:

Answer 18

Upper right-hand side of aircraft

Question 19

An APU fire will be extinguished automatically when:

Answer 19

On the ground.

Question 20

Max altitude for starting the APU.

Answer 20

37,000 feet.

Question 21

What tank does the APU fuel pump draw from?

Answer 21

The left collector tank.

Question 22

What batteries are required to start the APU in flight?

Answer 22

The APU battery and the main battery, both need a minimum of 22 volts.

Question 23

How long does the APU need to warm up before RTL (ready to load for pneumatic loading).

Answer 23

60 seconds (99% RPM + 60 seconds)

Question 24

What happens if you push the “ APU fire push” switch light???

Answer 24

1) arms squib
2) closes fuel SOV
3) closes LCV (load control valve) ( which is pressurized air control)

4) trips APU Generator (off)

Question 25

The APU door position is displayed on the

Answer 25

EICAS status page

Question 26

What is the LCV ?

Answer 26

Load Control Valve: Modulates to Control bleed air for air conditioning. ACSC

Question 27

What happens if you push the PWR fuel switch light ?

Answer 27

It initiates the APU pre-start sequence.

Question 28

Explain what your looking for on the APU pre-start check ?

Answer 28

Push the PWR FUEL switch light. 
ECU and Fuel pump activate. SOV opens. 
EICAS displays will show:
APU IN BITE (for 5 seconds)
DOOR OPEN (APU door open)
RPM and EGT pop up on ED2

Question 29

Where are the two APU remote cut-off switches located?

Answer 29

One is on the external services panel, the other is inside the APU compartment.