B-777 Air Systems

Front 1

How many recirculation fans are there?

Back 1

2

Front 2

What can cause the equipment cooling switch illuminate OVRD? (4)

Back 2

Both equipment cooling supply fans have failed OR

Smoke is detected in the equipment cooling system OR

Equipment cooling switch is off OR

Cargo fire FWD switch is armed

Front 3

What does A/C reset switch do?

Back 3

Reset a fault OR

Reset a pack OR

Reset a fan

Front 4

Can the cockpit temperature be controlled manually and if so how?

Back 4

Yes, the FLT DECK TEMP switch has a manual position at the 6 o'clock position. It is spring loaded. In MAN temperature can be cooled by moving dial to C or W

Front 5

With the M/D FLOW switch selected to HIGH what is happening?

Back 5

All operating packs are configured to high flow

Front 6

How much air exits the FWD and AFT outflow valve in the AUTO position?

Back 6

20% FWD

80% AFT

Front 7

The LDG ALT selector is pushed in, where does the pressurisation system gets it landing elevation from?

Back 7

Automatically from FMC

Front 8

What 2 indications are there to show the outflow valves are operating in the manual mode?

Back 8

Amber MAN on the switch light AND

"M" displayed in amber on the EICAS display next the affected outflow valve

Front 9

How many PACK controllers are there?

Back 9

2

Front 10

What will cause a pack to shutdown automatically?

Back 10

Overheat detected

Pack fault

Front 11

If one pack is in standby cooling mode and one is operating normally the pack in standby cooling mode will shut down when?

Back 11

The pack in standby cooling mode will shut down at lower altitudes and higher OAT. The pack will restart automatically when altitude and OAT are suitable for standby cooling.

Front 12

What pack services the FD and SUPRNMRY area?

Back 12

Left

Front 13

What does the ALTN VENT do?

Back 13

The Alternate Ventilation system provides airflow to cockpit and SUPRNMRY cabin when packs are inoperative. If airplane is not pressurised and ALTN VENT is on, air is drawn from AFT outflow valve.

When airplane is pressurized and ALTN VENT switch is on, there is no airflow.

Front 14

What is trim air?

Back 14

Trim air is hot engine engine bleed air introduced through trim air valves in the conditioned air supply ducts

Front 15

Is manual temperature control available for the SUPRNMRY cabin?

Back 15

No

Front 16

How is temperature controlled in the crew rest area?

Back 16

Manually by heater controls in the compartment

Front 17

In flight with the M/D FLOW switch to NORM what happens with the recirculation fans?

Back 17

Left fan is shut-off during normal flow operations

Front 18

What area's of the aircraft is equipment cooling supplied?

Back 18

Electrical and electronic equipment on the flight deck AND

Forward E & E compartment equipment racks

Front 19

Warm exhaust air from the forward E&E bay goes where?

Back 19

It gets exhausted through FWD outflow valve or sent to the lower cargo deck compartment if more heat is required

Front 20

If EQUIP COOLING is displayed on the EICAS on the ground what else will occur?

Back 20

Ground crew call horn will indicate the forward equipment cooling system is inoperative

Front 21

How is air sent to cool the equipment bay and flight deck electronics?

Back 21

2 fans provide conditioned air from the forward pack to the E & E bay.

Front 22

What is the maximum cabin altitude in cruise mode?

Back 22

8000'

Front 23

With a sudden loss of cabin pressurisation what will the outflow valves do?

Back 23

The outflow valves will automatically close.

Front 24

Engine bleed air has two stages of power. What are they and what determines what stage is used when?

Back 24

Low stage: used during high power operations

High stage: supplied when aircraft is on descent and other low power operations

Front 25

What altitude is APU bleed air available to?

Back 25

22,000'

Front 26

How many isolation valves are there and what is there normal position?

Back 26

3, generally the left and right are open and the center valve is open for APU operations on the ground to supply the packs or engine starting

Front 27

Is there duct leak and overheat protection?

Back 27

Yes, automatic.

Front 28

Can zone temperatures be maintained with the loss of trim air?

Back 28

Yes, cabin temperature controllers attempt to maintain all zones at average selected temperature

Front 29

When will the PACK switch illuminate OFF in amber?

Back 29

Switch position

OR

Internal faults

OR

Pack overheat

Front 30

If one pack is inoperative and the other in standby cooling, will the standby cooling pack shutdown at lower altitudes and higher temperatures?

Back 30

No

Front 31

If both packs are operating in standby cooling mode will they shut down at lower altitudes and higher temperatures?

Back 31

No, both will operate continuosly

Front 32

What modes do the packs have?

Back 32

Normal (high, normal flow)

Standby cooling - used for internal pack faults (automatic)