B777 Air Systems

Boeing 777 Air Systems

Boeing 777 Air Systems Revised 10/7/24

1 / 15

What system provides the heat for the forward cargo compartment?

Bleed air from the engines.

The trim air system.

Exhaust from the equipment cooling system.

Aft cargo heat system.

2 / 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 prevent smoke from entering the flight deck.

To defog the forward windows.

To cool the equipment in the aisle stand.

3 / 15

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

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

It allows the trim air valve to operate manually.

It removes control at the cabin attendant panel.

It removes power from the trim air system.

4 / 15

What does the PACK MODE R EICAS message indicate?

The standby cooling mode is inoperative.

The right pack is inoperative.

The airplane is in unfavorable conditions and right pack output temperature is too high.

The right pack is operating in the standby cooling mode.

5 / 15

Why should you minimize flight time at low altitude when the EQUIP COOLING OVRD message is displayed?

Monitor equipment temperature on EICAS.

Plan descent for minimum time at low altitude.

Turn off FWD & AFT recycling fans.

Descend to a lower altitude and continue the flight.

6 / 15

What is bleed air used for?

None of the above.

Both A & B.

Pressurizing the hydraulic reservoirs.

Aspirating the TAT probe.

7 / 15

What is bleed air used for? Select One Answer

Pressurizing the hydraulics reservoir.

Both A & B.

Aspirating the TAT probe.

8 / 15

What determines the pack outlmet temperature?

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

The CABIN TEMERATURE selector.

The flight deck temperature selector.

All statements are correct.

9 / 15

Where does air to the cabin come from, and what are the additional sources?

Right pack - lower recirculation system.

APU bleed air - outflow valves.

Both packs - upper and lower recirculation systems.

Left pack - upper recirculation system.

10 / 15

Why should you minimize flight time at low altitude when the EQUIP COOLING OVRD message is displayed?

Pack temperature would cause damage.

AFT and BULK cargo compartments may overheat.

Recirculation fans may not cool equipment adequately.

Electronic Equipment and displays may fail.

11 / 15

In flight, the cabin altitude controller operates in:

A descent mode.

A climb mode.

A cruise mode.

All statements are correct.

12 / 15

What happens when the BULK CARGO TEMPERATURE selector is positioned to HIGH?

The compartment temperature is automatically kept at approximately 21°C.

The compartment temp. İs automatically kept approximately 7°C.

The bulk cargo compartment ventilation fan operates continuously.

The compartment temperature is automatically kept at approximately 15°C.

13 / 15

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

False.

True.

14 / 15

What causes the trim air FAULT light to come on?

The pack flow control valves are commanded closed.

The trim air valve is commanded closed because of a zone supply duct overheat.

All statements are correct.

The trim air valve is commanded open

15 / 15

If one pack is in standby cooling and the other pack is operating normally, the pack in standby cooling mode shuts down at lower altitudes and higher outside air temperatures when ambient conditions do not permit standby cooling.

True.

False.

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