IranAir

Question 1

The FAULT light comes on amber on the APU bleed pushbutton switch when;

Answer 1

The system detects an APU leak

Question 2

When APU master switch is selected to OFF;

Answer 2

APU keeps running for a cooling period of 120 sec. at 100% speed.

Question 3

when the APU fuel feed pressure is low;

Answer 3

A special fuel pump that is run off the ESS AC SHED or AC STAT INV BUS supplies fuel

Question 4

When the APU is running the APU fuel pump :

Answer 4

Runs when tank pumps pressure is not sufficient

Question 5

With nobody in the cockpit ,if you have an APU FIRE, which statement is correct ?

Answer 5

On the ground , an APU EMER shut down will occur and the APU fire bottle will discharged automatically

Question 6

Fire on ground or in flight will cause the APU MASTER SW pushbutton FAULT light to come on

Answer 6

FALSE

Question 7

With battery power ,what would and APU fire test look like ?

Answer 7

APU FIRE pushbutton illuminated .

SQUIB and DISCH light illuminated .

Question 8

The starter engages if the APU air intake is closed and the MASTER SW and the START pushbuttons are ON .

Answer 8

FALSE

Question 9

The APU may obtain power for starting from :

Answer 9

ground services .
Normal aircraft supply .
The aircrafts batteries or in combination with the external power .

Question 10

The APU cannot be shut down from outside the aircraft

Answer 10

FALSE

Question 11

What of some of the causes for an APU automatic shutdown ?

Answer 11

fire ( on ground only), under speed , over speed , EGT over temperature , Reveres flow , low oil pressure, DC power loss

Question 12

Maximum altitude for APU bleed operation is :

Answer 12

20,000 ft

Question 13

The APU is supplied from the

Answer 13

Left fuel feed line

Question 14

ON ground , the No break Power Transfer function is inhibited in case of APU shut down generated by which of the following conditions ?

Answer 14

Automatic APU shut down triggered by the ECB.
APU shut down from the REFUEL/DEFUEL panel from the APU FIRE pushbutton .
APU shut down from emergency control provided on the external power panel.

Question 15

Can the APU be used with wing anti-ice on ?

Answer 15

No, but only for electrical power .The APU bleed valve should not be opened while using wing anti-ice .

Question 16

To start the APU the:

Answer 16

BAT 1 and 2 push buttons must be selected to ON.

Question 17

What is the function of the APU GEN push button located on the overhead electrical panel?

Answer 17

When selected OFF, the APU generator is de-energized.

It is normally left in the lights out position

Question 18

When the APU MASTER SW is selected ON

Answer 18

the APU computer automatically completes a self-test, opens the air intake flap and supplies fuel pressure.

Question 19

The APU may be started up to what altitude?

Answer 19

The APU can be started at any altitude provided normal aircraft electrical power is available.

Question 20

With the engines off, if the AVAIL light is illuminated on both the APU START push button and the EXT PWR push button, what is the source of electrical power for the aircraft busses?

Answer 20

The APU.

Question 21

The APU START push button, when selected ON, will:

Answer 21

start the APU if the APU MASTER SW was previously selected ON

Question 22

The APU system page will appear on the ECAM:

Answer 22

automatically whenever the APU is started and AC power is available.
when selected by the crew.

Question 23

If an APU fire occurs on the ground

Answer 23

The APU shuts down and the fire extinguisher discharges automatically

Question 24

The APU bleed P/B is selected ON

Answer 24

Provided APU speed is greater than 95% the APU valve opens , the Xbleed valve opens , and the engine bleed valves automatically close

Question 25

The Electronic Control Box (ECB) is primarily a full authority digital electronic
controller that performs the APU system logic for all modes of APU operation such as:

Answer 25

Sequence and monitoring of start.
Speed and temperature monitoring.
Monitoring of bleed air and shut down

Question 26

When the APU Master Switch is released, a normal APU shutdown occurs:

Answer 26

With a delay if the bleed air was in use.

Question 27

When selected on, the APU START push button, will

Answer 27

Start the APU if the APU MASTER SW was previously selected ON

Question 28

The APU has an integral independent lubrication system for lubrication and cooling

Answer 28

True

Question 29

The ECB ( Electronic Control Box) controls the APU fuel flow.

Answer 29

True

Question 30

The APU MASTER SW FAULT light will illuminate

Answer 30

When an automatic shutdown of the APU occurs

Question 31

You switch off the APU but curiously you still have the APU AVAIL indications

Answer 31

The APU will run for a cooling period of 60 to 120 seconds because you have been using the APU bleed

Question 32

With the engines off, if the AVAIL light is illuminated on both the APU START push button and the EXT PWR push button, what is the source of electrical
power for the aircraft busses?

Answer 32

The APU.

Question 33

When the APU is running, the APU fuel pump:

Answer 33

Runs when tank pumps pressure is not sufficient

Question 34

The APU BLEED valve is automatically closed above ____feet by the ECB.

Answer 34

23,000 feet

Question 35

With nobody in the cockpit, if you have an APU FIRE, which statement is correct?

Answer 35

On the ground, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically

Question 36

The basic element of the APU is a single shaft gas turbine which delivers _____power for driving the accessory gearbox (electrical generator) and produces bleed air (engine starting and pneumatic supply).

Answer 36

Mechanical shaft .

Question 37

With battery power, what would an APU fire test look like?

Answer 37

APU FIRE pushbutton illuminated.

SQUIB and DISCH lights illuminated

Question 38

The APU cannot be shut down from outside the aircraft,

Answer 38

False.

Question 39

What are some of the causes for an APU automatic shutdown?

Answer 39

Fire (on ground only), under speed, over speed, EGT over temperature, Reverse flow, Low oil pressure, DC power loss.