AIR COND Panel

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 last 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

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 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