15. AIR COND Panel (Air Cond/Press/Vent)

Question 1

If PACK FLOW is selected to LO, NORM or HIGH and only the APU is providing BLEED AIR or one pack is selected OFF, what will the packs provide?

Answer 1

HIGH flow rate, since the flow rate function is automatic.

Question 2

If the HOT AIR valve faults, what will happen to the temperature control system?

Answer 2

All trim air valves close and PACK 1 controls the cockpit temperature to the selected value. PACK 2 controls the cabin to the averages selected by the FWD and AFT CABIN temperature selector knobs.

Question 3

How are the PACKS controlled and operated?

Answer 3

Electrically controlled and pneumatically operated.

Question 4

What are some potential causes for a PACK FAULT light?

Answer 4

• Valve position disagrees with selected

• Compressor outlet overheat

• Pack outlet overheat

Question 5

What are some potential causes for ENG BLEED FAULT light?

Answer 5

• Bleed overpressure
• Bleed overheat
• Wing or engine leak on the related side
• Bleed valve NOT closed during engine start
• Bleed valve NOT closed with the APU BLEED ON

(LOOV) Leak, Over pressure, Over temp, Valve disagreement.

Question 6

What is the logic for the X-BLEED rotary selector?

Answer 6

• SHUT = the valve is closed.

• AUTO = open if the APU bleed valve is open; closed if APU bleed valve is closed or there is a wing, pylon or APU leak (except during an engine start).

• OPEN = the valve is open

Question 7

What does APU BLEED FAULT illumination indicate?

Answer 7

APU bleed leak.

Question 8

What does selecting the RAM AIR pushbutton accomplish?

Answer 8

Ram air inlet opens if the differential pressure is less than 1 PSI.

Question 9

What is the RAM AIR pushbutton used for?

Answer 9

• Smoke/fumes removal in cabin

• Ventilation of cabin with a dual pack failure

Question 10

How is the Bleed leak detection different on CEO and NEO aircraft?

Answer 10

• If a Bleed Air Monitoring Computer (BMC) fails on NEO airplane, over temperature protection is lost on the affected side. Has no effect on CEO

Question 11

When should you select LO pack flow?

Answer 11

• On the 319, when the number of passengers is below 138.

• On the 320, when the number of passengers is below 141.

• On the 321, select ON ECON FLOW when the number of passengers is below 168