Question Bank AIR

Question 1

In manual mode, with the Air FLOW selected in MAN position

Answer 1

The pack airflow switches to a default value based on FULL passenger capacity

Question 2

The Supplemental Cooling System (SCS) is a fully electrical system which
supplies cooling to the galleys and Avionics Ground Cooling Unit

Answer 2

The SCS has 3 cooling units that cool the fluid of the system. Two distribution units that supply this coolant to the galleys.

Question 3

Each pack has two pack valves

Answer 3

They are automatically controlled and regulate the quantity of hot air bleed that flows to each pack.

Question 4

Both pack valves automatically close

Answer 4

when ditching p/b is set to ON or during engine start and the cross bleed valve is open.

Question 5

To reach a stabilised temperature in the cabin

Answer 5

Air conditioning requires approx 20 mins.
10 mins for cabin temp adjustment and 10 mins to compensate for heat dissipation from cabin system.

Question 6

In case of Air Cycle Machine (ACM) failure:

Answer 6

Below FL 220 the pack must be set to OFF. Above FL 220 the pack can be used but pack performance is degraded.

Question 7

Following an automatic start, the APU bleed valve opens and supplies bleed air when:

Answer 7

Flight crew sets one engine master lever to START position. The aircraft is below FL250 and APU is AVAIL.

Question 8

RAM air p/b switch activates the emergency RAM air

Answer 8

by opening the RAM air inlet when differential pressure is less than 2 PSI and each outflow valve will open to approx 50%.
Note: above conditions provided DITCHING pb-sw is NOT set to ON.

Question 9

With air flow selector in NORM

Answer 9

the pack controller automatically adjusts the airflow to high demand if only one pack operates OR APU supplies bleed air

Question 10

In automatic mode, with Air Flow selector in NORM position

Answer 10

the airflow in the cabin/cockpit is automatically controlled depending on the number of pax entered on MFD, the aircraft flight level, and temperature regulation of the fwd cargo compartment on the CARGO AIR COND panel.

Question 11

The temperature control valve (TCV) adjust the pack outlet temperature

Answer 11

by adding air to the pack outlet flow:
below FL220, air for temperature adjustment comes from the pack valves via the Pack Discharge Heating Valve (PDHV) to prevent ice formation.
Above FL220, the air is sufficiently dry. The PDHV is fully closed, therefore air for temp adjustment comes from primary heat exchanger.