AIR SUPPLY

Question 1

When does the pack goes automatically to high flow? (3)

Answer 1

1 pack INOP
1 recirc fan INOP (same side)
Ground Operation (APU or GND source)

Question 2

When is High flow inhibited? (4)

Answer 2

wing anti ice ON and 1 eng supplying bleed
Engine INOP
Flaps NOT UP
AFT cargo switch ARMED (reduce flow in case of acrgo fire)

Question 3

L/R ENG HI STAGE means? (3)

Answer 3

Eng bleed air is excessive pressure
High press bleed air valve automatically locks closed
maintenance action required

Question 4

L/R ENG BLEED VAL means? (4)

Answer 4

eng bleed air temp is excessive
eng bleed air valve automatically closed
HP bleed valve closed
system can be reset

Question 5

L/R BLD DUCT LEAK means? (3)

Answer 5

high temp bleed air leak is detected
leak must be isolated
bleed source turned OFF to prevent structural damage

Question 6

PACK OFF means?

Answer 6

illuminated whenever the pack valve is closed

Question 7

When is the pack valve closes? (3)

Answer 7

pack control selector is OFF
pack trip has occured
with associated eng bleed air OFF light: loss of air to the pack

Question 8

Where does the barometric pressure correction for the pressurization system comes from?

Answer 8

from the Captain altimeter

Question 9

How many pressurization controller do we have for the outvlow valves?

Answer 9

3, 2 automatic and 1 manual

Question 10

What are the indication of an uncontrollable cabin pressurisation?

Answer 10

Pax cabin altitude increase
cabin rate increase
differential pressure decrease
outflow valve fully closed

Question 11

What happen to the APU valve with the isolation valve closed?

Answer 11

APU valve will close automatically if the left engine bleed air valve opens
APU bleed valve senses the positions of the engine bleed valves and isolation valve and closes automatically when an engine bleed air valve opens, but if the isolation valve is closed then the APU valve looks at the left engine bleed valve only

Question 12

In automatic control, an aneroid switch closes the outflow valve when?

Answer 12

Cabin altitude exceeds 11000ft

when aircraft descent below 9500ft the aneroid switches open and outflow circuits are restored

Question 13

Outflow valve opens when the pressure differential is?

Answer 13

Less than 2.5psi

Question 14

Prior to start with eng BLEED switches ON, eng bleed air OFF lights?

Answer 14

Are extinguished because they are dependant on switch position

Question 15

When is an air condioning pack is automatically set to maximum cooling?

Answer 15

When there is an overheat in the air as it leaves the pack

After cooling, the pack can be reset for automatic or standby operation by pushing the PACK RESET switch

Question 16

If one of the equipment cooling supply fans fails?

Answer 16

The alternate fan must be manually selected

Question 17

If a fault occurs in the automatic pack control, What happen to the pack temperature control valves?

Answer 17

it freeze in the last position

pack cannot be reset and must be operated in standby

Question 18

Supplemental heating of cargo compartment air is provided in which compartment?

Answer 18

the AFT compartment only by an electric heater.

FWD compartment does not require a supplemental heater