Boeing B777 - Air Systems

What causes the trim air FAULT light to come on?

All statements are correct.

The pack flow control valves are commanded closed.

The trim air valve is commanded open

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

Correct! Wrong!

What happens when you select the FWR CARGO A/C control to AUTO?

Packs operate at reduced flow rate.

The forward cargo heating system is shutoff and a selected temperature is displayed on the AIR synoptic.

The EICAS advisory message CARGO A/C FWD is displayed.

Pack flow rate is modulated to achieve a pack outlet temperature between 5 and 43°C.

Correct! Wrong!

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

Both packs - upper and lower recirculation systems.

Left pack - upper recirculation system.

Right pack - lower recirculation system.

APU bleed air - outflow valves.

Correct! Wrong!

When does the ground crew call horn sound?

Before starting the engine.

When cooling of forward electronic electrical equipment is inoperative.

In case of APU fire.

When hydraulics systems are pressurized.

Correct! Wrong!

If the cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume a cruise altitude of 39,000 feet.

True.

False.

Correct! Wrong!

What system provides the heat for the forward cargo compartment?

Bleed air from the engines.

Exhaust from the equipment cooling system.

The trim air system.

Aft cargo heat system.

Correct! Wrong!

The aft and bulk cargo compartments have independent bleed air heating systems. An insulated curtain separates the two compartments.

False.

True.

Correct! Wrong!

During normal bleed air operation, what position should the L, C, R ISLN BLEED AIR switches be in?

AUTO.

ON.

L ISLN AUTO, R ISLN AUTO, C ISLN OFF.

OFF.

Correct! Wrong!

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

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

On the air synoptic.

On the HYD synoptic.

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

Correct! Wrong!

Which component can be reset by the air conditioning reset switch.

The entire air conditioning system.

Packs only.

Reciculation fan switches only.

Trim air valves and recirculation fans.

Correct! Wrong!

Landing altitude (normally provided by the FMC) can be manually set using the LANDING ALTITUDE selector. Landing field selection limits are _ below sea level to _ feet above sea level.

1000 ft and 15 000 ft.

2000 ft and 14 000 ft.

1500 ft and 16 000 ft.

1000 ft and 13 000 ft

Correct! Wrong!

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

Shutoff the pack.

Increase airflow through the pack.

Decrease airflow to half rate.

Fail the pack standby cooling controller.

Correct! Wrong!

In flight, the cabin altitude controller operates in:

A descent mode.

All statements are correct.

A cruise mode.

A climb mode.

Correct! Wrong!

What is the indication that an outflow valve is in manual control?

Green light on the outflow valve.

Red light on the air synoptic.

Amber 'M' on the outflow valve indications.

No indication. Manual control is not displayed.

Correct! Wrong!

What is the source of supplemental heat for the aft cargo compartment?

Forward equipment cooling exhaust air.

An independent bleed air heating system.

Left recirculation fan.

An electric heater.

Correct! Wrong!

How are cargo compartments controlled in terms of temperature ranges?

Low is 0°C to 5°C - High is 15°C to 24°C

Low is 4°C to 10°C - High is 18°C to 24°C

Low is 10°C to 15°C - High is 25°C to 30°C

Low is 5°C to 10°C - High is 20°C to 25°C

Correct! Wrong!

The cabin altitude limiter closes both outflow valves if cabin altitude exceeds:

13 500 ft

14 000 ft.

15 000 ft.

10 000 ft.

Correct! Wrong!

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

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.

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.

Correct! Wrong!

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 EQUIP COOLING switch is in OVRD.

When the FWD CARGO FIRE ARM switch is ARMED.

Correct! Wrong!

What is the function of the negative pressure relief vents?

They regulate cabin pressure during climb.

They minimize cabin overpressure conditions.

They prevent negative pressure differential.

They improve smoke removal ventilation.

Correct! Wrong!

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

To prevent cabin overheat during low altitude flight

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

To set the actual temperature in cabin zones A-F.

To set the maximum temperature in any zone.

Correct! Wrong!

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.

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 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.

Correct! Wrong!

What does the PACK MODE R EICAS message indicate?

The right pack is operating in the standby cooling mode.

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

The right pack is inoperative.

The standby cooling mode is inoperative

Correct! Wrong!

If an overheat or other significant pack fault is detected, the pack shuts down automatically. An attempt to restore pack operation may not be made by pressing the AIR COND RESET switch.

True.

False.

Correct! Wrong!

What is bleed air used for?

Pressurizing the hydraulics reservoir.

Aspirating the TAT probe.

Pressurizing the hydraulics reservoir and sspirating the TAT probe.

Correct! Wrong!

If cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume a cruise altitude of:

35 000 ft.

39 000 ft.

33 000 ft.

37 000 ft.

Correct! Wrong!

Whic trim air valve can be moved directly by the flight crew, and how is it monitored?

Flight trim air valve - through a manual positions of the flight deck temperature selector.

Right trim air valve - monitored through the air synoptic.

Cabin trim air valve - monitored through the flight deck temperature selector.

Left trim air valve - monitored through the engine display.

Correct! Wrong!

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

To prevent smoke from entering the flight deck.

To cool the equipment in the aisle stand.

To defog the forward windows.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

This improves ventilation and smoke removal. Cabin altitude and full ventilation rates can be maintained by either valve.

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

Recirculation fans may not cool equipment adequately.

Equipment and displays could fail.

AFT and BULK cargo compartments may overheat.

Pack temperature would cause damage.

Correct! Wrong!

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

9000 feet.

9400 feet.

8000 feet.

7400 feet.

Correct! Wrong!

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

Correct! Wrong!

During isolation, the ENGINE and/or APU bleed switch OFF lights and the ISOLATION switch CLOSED lights illuminate and extinguish as the repective valves close and open.

What cabin differential pressure is scheduled for takeoff?

Slighlty negative.

Zero.

Slighlty positive.

Equal to the outside pressure.

Correct! Wrong!

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

OUTFLOW VALVE switches in OFF and LDG ALT selector pushed 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.

Correct! Wrong!

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

It allows the trim air valve to operate manually.

It removes control at the cabin attendant panel.

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

It removes power from the trim air system.

Correct! Wrong!

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

Recirculation fans may not cool equipment adequately.

Electronic Equipment and displays may fail.

AFT and BULK cargo compartments may overheat.

Pack temperature would cause damage.

Correct! Wrong!

How many packs are there and what is their main function?

One pack - managing ventilation.

Two packs - cooling supplied hot bleed air.

Three packs - providing cooling.

Four packs - controlling pressurization.

Correct! Wrong!

After engine start, what is the correct position for the L ENG and R ENG BLEED AIR switches?

OFF.

ON.

AUTO.

Correct! Wrong!

During climb, what parameter(s) schedule cabin altitude?

Airplane flight altitude.

A constant pressure differential.

Airplane climb rate and flight plan cruise altitude.

Airplane flight altitude and pressure altitude.

Correct! Wrong!

How does the trim air system meet zone temperature requirements?

It cools conditioned air.

It heats conditioned air.

It cools or heats conditioned air.

It controls pack air temperature.

Correct! Wrong!

What will cause the automatic closure of a bleed valve?

APU operation

Engine fire switch pulled.

Bleed air overtemp or overpressure.

Ground cart supplying bleed air.

Correct! Wrong!

If landing altitude is unavailable from the FMC (and not set in MAN), the EICAS advisory message LANDING ALT is displayed. The cabin altitude controller:

Assumes a landing altitude of 1500 ft.

Assumes a landing altitude of 1000 ft.

Assumes a landing altitude of 200 ft.

Assumes a landing altitude of 2000 ft.

Correct! Wrong!

What happens if the FLT DECK TEMP control is moved to the 'C' position?

It opens the flight deck trim air valve.

The pack temperature decreases.

It cancels input to the flight deck temperature controller.

It closes the trim air valve and lowers the flight deck temperature.

Correct! Wrong!

The controller uses ambient pressure and flight plan data from the FMC to calculate a cabin pressurization schedule. The schedule provides a comfortable cabin climb to cruise altitude.

True.

False.

Correct! Wrong!

In the cabin altitude controller cruise mode, maximum cabin altitude is 8,000 feet. The cabin altitude controllers enter cabin altitude controller descent mode at T/D or at initial descent of approximately _____ from cruise altitude, regardless of T/D.

1500 ft.

500 ft.

1000 ft.

750 ft.

Correct! Wrong!

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.

Correct! Wrong!

What determines the pack outlet temperature?

All statements are correct.

The flight deck temperature selector.

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

The CABIN TEMERATURE selector.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

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

True

False.

Correct! Wrong!

What action is required during preflight if the LANDING ALTITUDE EICAS message is displayed with the FWD and AFT OUTFLOW VALVE switches in AUTO?

Push the LDG ALT selector OUT.

Push the LDG ALT selector IN.

Select the FWD and AFT OUTFLOW valve switches to MAN.

Pull the LDG ALT

Correct! Wrong!

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

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 21°C.

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

Correct! Wrong!

When is the pack OFF light illuminated amber?

When the valve ıs failed closed.

During engine start.

All statements are true.

When there is a pack or compressor outlet high temperature condition.

Correct! Wrong!

Which of the following are landing elevation limits for B777?

1000 feet below to 14000 feet above sea level.

2000 feet below to 13000 feet above sea level.

2000 feet below to 12000 feet above sea level.

1000 feet below to 12000 feet above sea level.

Correct! Wrong!

When does a visible orange lip indicate on a pressure relief valve?

Set cabin altitude to less than 8000 ft.

Position the landing altitude switch to AUTO.

Advise maintenance of the open valve.

No action is required. The valve is in its normally closed position.

Correct! Wrong!

What protects the fuselage against excessive differential pressure?

Recirculation fans.

Trim air valves

Cabin altitude limiter.

Positive and negative pressure relief valves.

Correct! Wrong!

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

The mode is selected automatically.

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

Correct! Wrong!

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

Both right and left trim air systems.

Center trim air system.

Right trim air system.

Left trim air system.

Correct! Wrong!

During preflight, what position should the APU BLEED AIR switch be in?

OFF.

AUTO.

AUTO or OFF

Correct! Wrong!

What must be done to manually set a landing altitude?

Check the FMC for automatic landing elevation adjustment.

Pull the manual landing elevation selector out then set the required altitude.

Adjust the trim air valves to the desired altitude.

Press the AUTO button on the cabin altitude controller

Correct! Wrong!

The LANDING ALTITUDE advisory message indicates which of the following?

A landing was made to different altitude.

The preset landing altitude is not correct.

The FMC does not supply a landing altitude or the landing altitude selector is pulled.

Correct! Wrong!

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

The aft equipment cooling and ventilating system provides cooling.

The forward system reconfigures automatically to an override mode.

The backup supply fan operates automatically.

The EICAS advisory message EQUIP COOLING is displayed.

Correct! Wrong!

In flight, the normal source of bleed air for all systems except the engine anti-ice is the engine low stage compressor (at high power) or intermediate stage compressor (at low power).

True.

False.

Correct! Wrong!

Which of the following is false for the PACK Switch illuminating OFF?

The PACK switched is pushed on.

The pack valve is failed or closed.

Bleed air pressure is inadequate.

A pack or compressor outlet high temperature has occurred.

Correct! Wrong!

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.

False.

True.

Correct! Wrong!

For Boeing 777, the APU Bleed Air is available at all altitudes.

False.

True.

Correct! Wrong!

When is the center bleed isolation valve open?

During descent.

During climb and descent.

During engine start.

During single bleed source operation.

Correct! Wrong!

What is the normal source of bleed air to start the second engine?

APU.

Engine.

Ground cart(s)

Correct! Wrong!

What is the normal position of the forward outflow valve after landing?

Full open.

In transit.

30 degrees open.

Full closed.

Correct! Wrong!

Each trim air system supplies three zone supply ducts, with the left trim air system also supplying the flight deck.

True.

False.

Correct! Wrong!

What landing altitude is displayed on the EICAS pressurization system indications when the airplane has traveled more than 400 miles or has passed the halfway point?

The destination airport altitude to the nearest 500 feet.

The alternate airport altitude to the nearest 50 feet.

The destination airport altitude to the nearest 100 feet.

The departure airport altitude to the nearest 100 feet.

Correct! Wrong!

Which of the followings are bleed air sources?

Trim air.

Packs.

Demand pump.

APU and Ground Cart.

Correct! Wrong!

Boeing B777 – Air Systems

Quiz

Boeing B777 - Air Systems

What causes the trim air FAULT light to come on?

What happens when you select the FWR CARGO A/C control to AUTO?

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

When does the ground crew call horn sound?

If the cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume a cruise altitude of 39,000 feet.

What system provides the heat for the forward cargo compartment?

The aft and bulk cargo compartments have independent bleed air heating systems. An insulated curtain separates the two compartments.

During normal bleed air operation, what position should the L, C, R ISLN BLEED AIR switches be in?

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

Which component can be reset by the air conditioning reset switch.

Landing altitude (normally provided by the FMC) can be manually set using the LANDING ALTITUDE selector. Landing field selection limits are _____ below sea level to _____ feet above sea level.

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

In flight, the cabin altitude controller operates in:

What is the indication that an outflow valve is in manual control?

What is the source of supplemental heat for the aft cargo compartment?

How are cargo compartments controlled in terms of temperature ranges?

The cabin altitude limiter closes both outflow valves if cabin altitude exceeds:

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

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

What is the function of the negative pressure relief vents?

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

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.

What does the PACK MODE R EICAS message indicate?

If an overheat or other significant pack fault is detected, the pack shuts down automatically. An attempt to restore pack operation may not be made by pressing the AIR COND RESET switch.

What is bleed air used for?

If cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume a cruise altitude of:

Whic trim air valve can be moved directly by the flight crew, and how is it monitored?

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

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

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

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

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:

What cabin differential pressure is scheduled for takeoff?

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

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

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

How many packs are there and what is their main function?

After engine start, what is the correct position for the L ENG and R ENG BLEED AIR switches?

During climb, what parameter(s) schedule cabin altitude?

How does the trim air system meet zone temperature requirements?

What will cause the automatic closure of a bleed valve?

If landing altitude is unavailable from the FMC (and not set in MAN), the EICAS advisory message LANDING ALT is displayed. The cabin altitude controller:

What happens if the FLT DECK TEMP control is moved to the 'C' position?

The controller uses ambient pressure and flight plan data from the FMC to calculate a cabin pressurization schedule. The schedule provides a comfortable cabin climb to cruise altitude.

In the cabin altitude controller cruise mode, maximum cabin altitude is 8,000 feet. The cabin altitude controllers enter cabin altitude controller descent mode at T/D or at initial descent of approximately _____ from cruise altitude, regardless of T/D.

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.

What determines the pack outlet temperature?

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

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

What action is required during preflight if the LANDING ALTITUDE EICAS message is displayed with the FWD and AFT OUTFLOW VALVE switches in AUTO?

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

When is the pack OFF light illuminated amber?

Which of the following are landing elevation limits for B777?

When does a visible orange lip indicate on a pressure relief valve?

What protects the fuselage against excessive differential pressure?

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

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

During preflight, what position should the APU BLEED AIR switch be in?

What must be done to manually set a landing altitude?

The LANDING ALTITUDE advisory message indicates which of the following?

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

In flight, the normal source of bleed air for all systems except the engine anti-ice is the engine low stage compressor (at high power) or intermediate stage compressor (at low power).

Which of the following is false for the PACK Switch illuminating OFF?

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.

For Boeing 777, the APU Bleed Air is available at all altitudes.

When is the center bleed isolation valve open?

What is the normal source of bleed air to start the second engine?

What is the normal position of the forward outflow valve after landing?

Each trim air system supplies three zone supply ducts, with the left trim air system also supplying the flight deck.

What landing altitude is displayed on the EICAS pressurization system indications when the airplane has traveled more than 400 miles or has passed the halfway point?

Which of the followings are bleed air sources?

Landing altitude (normally provided by the FMC) can be manually set using the LANDING ALTITUDE selector. Landing field selection limits are _ below sea level to _ feet above sea level.