Air systems

Question 1

In the PACK fail non-normal procedure, the crew selects a warmer temperature in order to?

Answer 1

Reduce the workload on the affected air conditioning pack.

Question 2

In MANUAL pressurisation mode, the outflow valve is driven by?

Answer 2

A motor supplied from DC standby bus

Question 3

Where are the bleed trip sensors installed?

Answer 3

The sensors are positioned on both sides of the engine bleed air valve

Question 4

If all TEMPERATURE ZONE SELECTORS are positioned to OFF, what temperatures do the packs maintain?

Answer 4

The left pack maintains 24 degrees, the right 18 degrees.

Question 5

Isolation valve in AUTO - When does it open?

Answer 5

If either engine Bleed valve is off or Pack switch is off.

Question 6

What happens when DUCT OVERHEAT light comes on?

Answer 6

Air mix valves drive full cold

Question 7

what happens when PACK TRIP OFF light illuminates?

Answer 7

Pack Temp has exceeded limits - Pack valve automatically closes and mix valves drive full cold

Question 8

If the aircraft is not on the ground and the flaps are up, if both packs are in auto and one engine fails or a pack switch is selected to Auto the remaining pack will switch to High flow automatically? - Why doesn’t this occur on the ground or with Flaps down?

Answer 8

To ensure adequate engine performance is available for OEI operations.

Question 9

Is the Recirculation fan AC or DC driven?

Answer 9

AC driven (AC Motor)

Question 10

ZONE TEMPERATURE
What zone does the left electronic controller control and what zone does the right controller control?

Answer 10

Left electronic controller controls the aft cabin zone and provides backup for the flight deck, the Right controls the forward cabin zone and provides primary control for the flight deck.

Question 11

Will failure of the primary flight deck controller cause a master caution?

Answer 11

No, the Standby will automatically take over. The CONT CAB and ZONE TEMP lights will illuminate on Recall.

Question 12

What type of motor powers the cabin pressurisation controller?

Answer 12

DC motor

Question 13

How many trim air pressure regulators are there in the air conditioning system?

Answer 13

1

Question 14

In the parking checklist, what position are the ENG bleeds left in?

Answer 14

ON

Question 15

What do COWL ANTI-ICE (Located on the Probe heat panel) indicate?

Answer 15

An over-pressure condition in duct downstream of engine cowl anti-ice valve

Question 16

True or False?
- Stall warning logic adjust stick shaker and minimum manoeuvre speed bars on the airspeed indicators and adjusts the FMC displayed VREF

Answer 16

False!
The FMC displayed VREF is not adjusted