Air Cond

Question 1

If PACK FLOW is set to LO, NORM, or HIGH and only APU is supplying bleed air or one pack is off, what flow is provided?

Answer 1

HIGH flow rate is automatically selected

Question 2

If the HOT AIR valve faults, what happens to temperature control?

Answer 2

All trim air valves close; PACK 1 controls cockpit temp; PACK 2 controls cabin based on FWD and AFT CABIN knobs

Question 3

How are the PACKS controlled and operated?

Answer 3

Electrically controlled, pneumatically operated

Question 4

What are some causes of a PACK FAULT light?

Answer 4

Valve disagreement, compressor outlet overheat, or pack outlet overheat

Question 5

What are some causes of an ENG BLEED FAULT light?

Answer 5

Overpressure, overheat, wing/engine leak, valve open during start, or with APU BLEED ON

Question 6

What’s the logic of the X-BLEED rotary selector?

Answer 6

SHUT: valve closed; AUTO: opens if APU BLEED ON; OPEN: valve forced open

Question 7

What does APU BLEED FAULT light mean?

Answer 7

Leak in the APU bleed duct

Question 8

What does selecting the RAM AIR pushbutton accomplish?

Answer 8

Opens the ram air inlet if differential pressure is <1 PSI

Question 9

What is the RAM AIR pushbutton used for?

Answer 9

Smoke/fumes removal or cabin ventilation in case of dual pack failure

Question 10

How is bleed leak detection different between CEO and NEO?

Answer 10

NEO: loss of BMC disables over-temp protection on that side; CEO: unaffected

Question 11

When should LO pack flow be selected?

Answer 11

A320: <141 pax; A321: select ECON FLOW when <168 pax