B777 Air Systems

Boeing 777 Air Systems

Boeing 777 Air Systems Revised 10/7/24

1 / 15

Why does the pressurization system schedule the cabin altitude slightly below airport field elevation for landing?

So the airplane will land somewhat pressurized.

Both A and B are correct.

For structural reasons.

So the airplane will land somewhat depressurized.

2 / 15

In the standby cooling mode, what will the pack automatically do if the airplane is not in an area of sufficient cooling?

Fail the pack standby cooling controller.

Shutoff the pack.

Decrease airflow to half rate.

Increase airflow through the pack

3 / 15

What is the function of the negative pressure relief vents?

They prevent negative pressure differential.

They improve smoke removal ventilation.

They minimize cabin overpressure conditions.

They regulate cabin pressure during climb.

4 / 15

When does the ground crew call horn sound?

Before starting engines.

In case of APU fire.

When cooling of forward electronic/electrical equipment is inoperative.

When hydraulics are pressurized.

5 / 15

What is the cabin altitude at maximum certified airplane operating altitude?

7,400 feet.

8,000 feet.

9,400 feet

9,000 feet.

6 / 15

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

Right trim air system.

Center trim air system.

Both right & left trim air systems.

Left trim air system.

7 / 15

What happens if the forward equipment cooling primary supply fan fails?

The backup supply fan operates automatically.

The EICAS advisory message EQUIP COOLING is displayed.

The forward system reconfigures automatically to an override mode.

The aft equipment cooling and ventilating system provides cooling.

8 / 15

Which of the following are landing elevation limits for B777?

2000 feet below to 12000 feet above sea level.

1000 feet below to 14000 feet above sea level.

1000 feet below to 12000 feet above sea level.

2000 feet below to 13000 feet above sea level.

9 / 15

Automatic ventilation of the Forward Cargo Compartment Air Conditioning System ensures that smoke and objectionable odors do not enter the flight deck or passenger cabin.

False.

True.

10 / 15

What will cause the automatic closure of a bleed valve?

Ground cart supplying bleed air.

APU operation

Bleed air overtemp or overpressure.

Engine fire switch pulled.

11 / 15

Flight Deck Temperature (FLT DECK TEMP) selector in mid position sets the temperature to approximately 75°F (24°C)

False.

True.

12 / 15

With the CARGO TEMPERATURE selector set to LOW or HIGH, the respective cargo heat shutoff valve opens and the temperature control valve opens and closes to maintain the temperature in the compartment.

The lavatory/galley vent fans draw air across temperature sensors in each compartment. If both vent fans fail, cargo heat is not provided.

The lavatory/galley vent fans draw air across temperature sensors in each compartment.

The lavatory vent fans draw air across temperature sensors in each compartment. If both vent fans fail, cargo heat is still provided but at a low rate.

13 / 15

If a pack overheats or fails the pack shuts down and an air conditioning may be needed.

True.

False.

14 / 15

If a duct leak is detected, the system automatically isolates the leak. The EICAS caution message BLEED LEAK is displayed. The automatic isolation logic may include:

One, two, or three sequential steps.

Betwwen one and four sequential steps.

One or two sequential steps

15 / 15

Which of the followings are bleed air sources?

Trim air.

Demand pump.

APU and Ground Cart.

Packs.

Your score is

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