Air Conditioning

Question 1

What controls the packs

Answer 1

The Air System Control Unit (ASCU) controls the pack. There is one ASCU per pack. The ASCU is a dual-lane controller.

Question 2

What happens in case of pack overheat in flight?

Answer 2

When the pack overheats the fault light in the PACK pb sw comes on. (Associated with the following ECAM
alert: AIR PACK 1(2) OVHT).
On the ground the active pack valve of a pack will automatically close, if the associated pack overheats.

Question 3

When do pack valves close?

Answer 3

The active pack valve of a pack will automatically close, if:
There is not sufficient upstream pressure, or
The FIRE pb-sw of the associated engine is pressed, or
The associated PACK pb is set to OFF, or
The associated pack overheats, and the aircraft is on ground, or
There is a leak detection, or
The onside engine starts

Question 4

How many pack valves are there on each pack

Answer 4

For each pack, there are two pack valves. Only one is active, the other is in standby.

Question 5

Bulk Cargo Ventilation

Answer 5

The bulk cargo compartment has a heating system.
Some air from the cabin recirculates into the bulk cargo compartment for ventilation and temperature control.
An electrical heater heats the air that flows into the bulk cargo compartment.
Two isolation valves (manually controlled using the BULK ISOL VALVES pb-sw on the CARGO AIR COND pane)
permit the isolation of the bulk cargo compartment

Question 6

Cargo Extraction Valve SD PAGE EXAMPLE

Answer 6

There’s a CARGO EXTRACTION FAN INDICATION and CARGO ISOLATION VALVE INDICATION showing extraction valve closed