B777 Air Systems

Boeing 777 Air Systems

Boeing 777 Air Systems Revised 10/7/24

1 / 15

Why does the flight deck receive air from the left pack at a higher pressure than the passenger cabin?

The pilots demand it.

To defog the forward windows.

To prevent smoke from entering the flight deck.

To cool the equipment in the aisle stand.

2 / 15

Where is the target temperature for the air conditioning zones displayed?

On the HYD synoptic

On the upper EICAS display when pressurization is selected to MAN.

On the air synoptic.

On the lower EICAS display when pressurization is selected to MAN.

3 / 15

What does the MAN position on the FLT DECK TEMP control do?

It removes power from the trim air system.

It removes control at the cabin attendant panel.

It causes the packs to provide air at an average mid temperature range.

It allows the trim air valve to operate manually.

4 / 15

Why should the CABIN TEMP control be set to mid position?

To set the actual temperature in cabin zones A-F

To set the maximum temperature in any zone.

To allows ± 6˚C temperature range adjustment on cabin attendant panel.

To prevent cabin overheat during low altitude flight.

5 / 15

When does the ground crew call horn sound?

Before starting engines.

When hydraulics are pressurized.

When cooling of forward electronic/electrical equipment is inoperative.

In case of APU fire.

6 / 15

Which statement(s) is (are) correct about the equipment cooling override mode?

There is a non normal procedure for this message.

The EICAS message EQUIP COOLING OVRD is displayed.

The mode is selected automatically.

All of the above is correct.

7 / 15

How does the trim air system meet zoner temperature requirements?

It controls pack air temperature.

It heats conditioned air.

It cools conditioned air

8 / 15

What determines the pack outlmet temperature?

The CABIN TEMERATURE selector.

All statements are correct.

The flight deck temperature selector.

The temperature zone requiring the coolest temperature controls the pack outlet temperature.

9 / 15

Forward Equipment Cooling system does not reconfigure automatically to override mode automatically for which of the following?

When both supply fans fail in flight.

When high air airflow is detected in flight.

When the FWD CARGO FIRE ARM switch is ARMED.

When the EQUIP COOLING switch is in OVRD.

10 / 15

When is the center bleed isolation valve open?

During climb and descent.

During engine start.

During single bleed source operation.

During descent.

11 / 15

Which system(s) supply trim air to the flight deck?

Left trim air system.

Right trim air system.

Both right and left trim air systems.

Center trim air system.

12 / 15

During preflight, what position should the FWD and AFT OUTFLOW VALVE switches and LDG ALT selector be in?

OUTFLOW VALVE switches in AUTO and LDG ALT selector pulled out.

OUTFLOW VALVE switches in MAN and LDG ALT selector pushed IN.

OUTFLOW VALVE switches in AUTO and LDG ALT selector pushed IN.

OUTFLOW VALVE switches in OFF and LDG ALT selector pushed IN.

13 / 15

Two outflow valves are installed: one forward and one aft. Normally, most of the outflow is through the forward outflow valve.

True.

False.

14 / 15

What is the most correct statement about the equipment cooling override mode?

The EICAS message EQUIP COOLING OVRD is displayed and there is a non normal procedure to be performed.

The mode is selected automatically, and the EICAS message EQUIP COOLING OVRD is displayed.

The mode is selected automatically, the EICAS message EQUIP COOLING OVRD is displayed. There is a non normal procedure for this message.

The mode is selected automatically.

15 / 15

How are zone target temperatures selected, and what is the temperature range?

Automatically set by the system with a temperature range between 10°C and 40°C.

Manually set by the flight crew with a temperature range between 18°C and 29°C.

Manually set by the cabin crew with a temperature range between 0°C and 30°C.

Automatically adjusted based on the outside temperature with a temperature range between 15°C and 35°C.

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