ATA49 - APU

Question 1

104. APU may be used :
     On ground and in flight
     On ground and during TAKE-OFF
     Only on ground

Answer 1

On ground and in flight

Question 2

105. APU MASTER SW P/B FAULT amber ; ECAM shows APU AUTO SHUT DOWN ; it
     means :
     An automatic APU shut down after a reason other than a fire
     APU FAULT without AUTO shutdown
     APU is runnig while Ground Power Unit is connected to the aircraft

Answer 2

An automatic APU shut down after a reason other than a fire

Question 3

106. APU FUEL PUMP is used :
     For batteries APU start up
     When tank pump pressure is not available
     Both answers are correct

Answer 3

Both answers are correct

Question 4

107. In case of an APU FIRE on ground :
     APU can only be stopped from the cockpit
     Fire extinguisher bottle can be operated from the external POWER PANEL
     APU shut down and extinguishing agent discharge are fully automatic

Answer 4

APU shut down and extinguishing agent discharge are fully automatic

Question 5

108. On ground, APU should provide :
     ELEC POWER + HYDRAULIC POWER
     ELEC POWER + BLEED AIR

Answer 5

ELEC POWER + BLEED AIR

Question 6

109. When APU MASTER SW is released, APU normally stops :
     With no delay in all cases
     With a delay in all cases
     After a 2 minutes cooling period if APU BLEED AIR was used

Answer 6

After a 2 minutes cooling period if APU BLEED AIR was used

Question 7

110. When APU is running, APU FUEL PUMP :
     Runs if tank pump pressure is not sufficient
     Runs all the time
     Runs only in flight

Answer 7

Runs if tank pump pressure is not sufficient

Question 8

111. Can you start the APU using the aircraft BATTERIES :
     Yes
     No

Answer 8

Yes

Question 9

112. APU N indication becomes amber on ECAM SD, when :
     N >107%
     N >102%
     N >99%

Answer 9

N >102%

Question 10

113. The APU is supplied from the :
     Right fuel feed line
     Left fuel feed line

Answer 10

Left fuel feed line

Question 11

114. APU BLEED AIR is controlled :
     By Electronic Control Box (ECB)
     Not controlled
     By APU BLEED VALVE which operates as shut off valve

Answer 11

By Electronic Control Box (ECB)

Question 12

115. APU start up is available :
     Only on aircraft batteries
     On normal AC electric system,with batteries buffer
     Both answers are correct

Answer 12

Both answers are correct

Question 13

116. What does “AVAIL” light mean ?
     ECB self test is completed
     APU N is above 99,5% or 2 sec after N reaches 95%
     APU may be started up

Answer 13

APU N is above 99,5% or 2 sec after N reaches 95%

Question 14

117. APU starts after :
     Master switch ON and flap open
     Master switch ON and START P/B ON
     Master switch ON, START P/B ON and flap open

Answer 14

Master switch ON, START P/B ON and flap open

Question 15

118. APU EGT indication becomes red on ECAM SD when :
     EGT > 515°C (APU RUNNING)
     EGT > 1038°C (APU START UP)
     EGT > 675°C (APU RUNNING) or EGT > 1090°C (APU START UP)

Answer 15

EGT > 675°C (APU RUNNING) or EGT > 1090°C (APU START UP)