Pneumatics/Press/Aircon

Question 1

Can the packs run when the aircraft is in External Power ON mode

Answer 1

Yes, with any Fwd Ext Pwr ON and Aft Ext power ON

Question 2

What 3 modes does the Cabin Pressure Control System CPCS operate in

Answer 2

Climb, Cruise, Descent

Question 3

If the left trim air system is off, what temperature will the cabin temperature controllers try to achieve in all zones

Answer 3

The average target temperature with the flightdeck maintained between 18° and 29°C

Question 4

For normal engine starts when do the packs restart

Answer 4

At least two minutes after the engine start sequence is started, and the engine is running

Question 5

What is the source of a Flightdeck air

Answer 5

Received 100% conditioned outside air

Question 6

How is smoke prevented from entering the flight deck

Answer 6

The flight deck airflow is at a greater pressure that the cabin supply

Question 7

What is the purpose of the cabin air compressors (CACs)

Answer 7

To pressurise and regulate the flow of outside air to the packs

Question 8

When the pressurisation system is in cruise mode, (with no issues) the cabin altitude is no more than

Answer 8

6000’

Question 9

With pressurisation in auto and cruise altitude data not available, what is the aircraft default cruise altitude

Answer 9

43,000 feet

Question 10

What is the indication on the EICAS display that an outflow valve is under manual control

Answer 10

The letter M (Amber) is displayed next to the outflow valve position indicators

Question 11

The alternate ventilation system (AVS) provides an alternate means of ventilating the cabin and flightdeck, which statement is true

Answer 11

The system consists of a Flightdeck switch and duct that delivers outside airflow downstream of the left pack outlet

Question 12

In a cabin depressurisation, what is the position of the outflow valves when the aeroplane reaches 15,000 feet, or descends below the cabin altitude

Answer 12

Fully open

Question 13

What is the purpose of the power electronics cooling system (PECS)

Answer 13

To cool the large motor power distribution system in the aft E/E equipment compartment

Question 14

What is the min time before total power down wrt the PECS cooling system

Answer 14

10 mins with 2 powers plugged in and 22 mins with 1 power.

Question 15

Which cargo compartment can you not put animals?

Answer 15

Aft - (it is kept above freezing, that is all)

Question 16

Flying to Mexico, what will the cabin be achieving (cabin altitude)

Answer 16

It will climb the cabin to 6000’, then climb the cabin in the descent to 7500’ (elev)

Question 17

If landing alt is not avail from the FMC and not set in MAN, the LANDING ALTITUDE will be displayed and the cabin alt controller assumes a landing altitude of what?

Answer 17

2000’