Air Conditioning

Question 1

Which zone air condition provide to?

Answer 1

3 zone: Cockpit, FWD Cabin, AFT Cabin

3 zones are independently controlled

Question 2

Air is supplied by pneumatic system via?

Answer 2

• 2 pack flow control valves
• 2 packs
• The mixing unit, which mixes the air that comes from the cabin and packs

Question 3

A ram air inlet can provide ambient air to the mixing unit in which condition?

Answer 3

In emergency

Question 4

Temperature regulation of the temperature is controlled by?

Answer 4

1 zone controller and 2 pack controlled

Question 5

When is the pack flow control valve close automatically?

Answer 5

In case of pack overheat (on ground only), eng start, or operation of the fire or ditching pb

Question 6

Emergency Ram Air

Answer 6

Ventilate the cockpit and cabin to remove smoke, or if both pack fail

Outflow valve does not automatically open if it is under manual control, even if /\P is less than 1 PSI

Question 7

Hot air pressure-regulating valve close automatically when?

Answer 7

• The duct overheat
• The cockpit trim air valve fail
• Both cabin trim air valve fail

Question 8

When do pack controller close?

Answer 8

Ram air inlet flap close during takeoff and landing to avoid ingestion of foreign matter
* During takeoff, close when TO power set and main landing gear struts are compressed
* During landing, close as soon as the main landing gear struts are compressed as long as speed is at or above 70kt.
Open 20s after speed drop below 70kt

Question 9

When is the system deliver higher flow?

Answer 9

Whatever the Econ Flow selects, the system deliver higher flow (40% more than Econ Flow):

• In single operation
• When the APU is supplying bleed air

Question 10

Zone controller

Answer 10

Have a primary channel In normally and secondary channel that act as a back up if the primary fail

• primary failure: secondary operates as backup, zone controlled to 24C
• secondary failure: no effect, backup mode is lost
• primary and secondary failure: optimized and backup is lost. The pack deliver a fixed temp 20C for pack 1, 10C for pack 2

Question 11

Pack controller

Answer 11

• Primary failure: regulation is not optimized. Pack flow is fixed at previous setting
• Secondary failure: no effect, backup mode is lost
• Primary and Secondary failure: pack outlet temp is controlled by anti-ice valve and is stabilized to a temp between 5C and 30C in a maximum of 6 min

Question 12

Hot air pressure regulating valve failure

Answer 12

• Failed open: No effect
• Fail closed: optimized regulation is lost
  Pack 1 control the cockpit
  Pack 2 control the cabin