Boeing B777 - Air Systems

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

Airplane flight altitude.

Airplane climb rate and flight plan cruise altitude.

Airplane flight altitude and pressure altitude.

A constant pressure differential.

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!

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.

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

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.

It opens the flight deck trim air valve.

Correct! Wrong!

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

A pack or compressor outlet high temperature has occurred.

The pack valve is failed or closed.

The PACK switched is pushed on.

Bleed air pressure is inadequate.

Correct! Wrong!

What does the PACK MODE R EICAS message indicate?

The right pack is inoperative.

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

The standby cooling mode is inoperative

The right pack is operating in the standby cooling mode.

Correct! Wrong!

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

14 000 ft.

10 000 ft.

15 000 ft.

13 500 ft

Correct! Wrong!

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

One pack - managing ventilation.

Three packs - providing cooling.

Two packs - cooling supplied hot bleed air.

Four packs - controlling pressurization.

Correct! Wrong!

What must be done to manually set a landing altitude?

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

Check the FMC for automatic landing elevation adjustment.

Correct! Wrong!

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

Center trim air system.

Right trim air system.

Both right and left trim air systems.

Left trim air system.

Correct! Wrong!

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

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 AUTO and LDG ALT selector pulled out.

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

Correct! Wrong!

Which of the followings are bleed air sources?

Trim air.

Packs.

Demand pump.

APU and Ground Cart.

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.

2000 ft and 14 000 ft.

1500 ft and 16 000 ft.

1000 ft and 15 000 ft.

1000 ft and 13 000 ft

Correct! Wrong!

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

Right pack - lower recirculation system.

Left pack - upper recirculation system.

Both packs - upper and lower recirculation systems.

APU bleed air - outflow valves.

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.

False.

True.

Correct! Wrong!

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

30 degrees open.

Full open.

In transit.

Full closed.

Correct! Wrong!

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

Electronic Equipment and displays may fail.

Pack temperature would cause damage.

AFT and BULK cargo compartments may overheat.

Recirculation fans may not cool equipment adequately.

Correct! Wrong!

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

Position the landing altitude switch to AUTO.

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

Set cabin altitude to less than 8000 ft.

Advise maintenance of the open valve.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

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

ON.

AUTO.

OFF.

Correct! Wrong!

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

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

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

To prevent cabin overheat during low altitude flight

To set the maximum temperature in any zone.

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!

What cabin differential pressure is scheduled for takeoff?

Zero.

Slighlty negative.

Slighlty positive.

Equal to the outside pressure.

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.

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

Left trim air valve - monitored through the engine display.

Right trim air valve - monitored through the air synoptic.

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 removes power from the trim air system.

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

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 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

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

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 upper EICAS display when pressurization is selected to MAN.

On the HYD synoptic.

Correct! Wrong!

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

The mode is selected automatically.

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

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, and the EICAS message EQUIP COOLING OVRD is displayed.

Correct! Wrong!

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

33 000 ft.

37 000 ft.

39 000 ft.

35 000 ft.

Correct! Wrong!

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

Left recirculation fan.

An independent bleed air heating system.

Forward equipment cooling exhaust air.

An electric heater.

Correct! Wrong!

What is the function of the negative pressure relief vents?

They minimize cabin overpressure conditions.

They improve smoke removal ventilation.

They regulate cabin pressure during climb.

They prevent negative pressure differential.

Correct! Wrong!

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

Packs only.

Trim air valves and recirculation fans.

Reciculation fan switches only.

The entire air conditioning system.

Correct! Wrong!

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

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

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

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

Packs operate at reduced flow rate.

Correct! Wrong!

What is bleed air used for?

Aspirating the TAT probe.

Pressurizing the hydraulics reservoir.

Pressurizing the hydraulics reservoir and sspirating the TAT probe.

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!

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

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.

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

Correct! Wrong!

What system provides the heat for the forward cargo compartment?

Exhaust from the equipment cooling system.

Aft cargo heat system.

The trim air system.

Bleed air from the engines.

Correct! Wrong!

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

When high air airflow is detected in flight.

When both supply fans fail in flight.

When the FWD CARGO FIRE ARM switch is ARMED.

When the EQUIP COOLING switch is in OVRD.

Correct! Wrong!

When is the center bleed isolation valve open?

During climb and descent.

During descent.

During single bleed source operation.

During engine start.

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.

750 ft.

1000 ft.

Correct! Wrong!

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.

Correct! Wrong!

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

The compartment temperature is automatically kept at approximately 15°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 21°C.

Correct! Wrong!

What will cause the automatic closure of a bleed valve?

Engine fire switch pulled.

Bleed air overtemp or overpressure.

APU operation

Ground cart supplying bleed air.

Correct! Wrong!

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

No indication. Manual control is not displayed.

Green light on the outflow valve.

Amber 'M' on the outflow valve indications.

Red light on the air synoptic.

Correct! Wrong!

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

The forward system reconfigures automatically to an override mode.

The aft equipment cooling and ventilating system provides cooling.

The EICAS advisory message EQUIP COOLING is displayed.

The backup supply fan operates automatically.

Correct! Wrong!

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

AUTO or OFF

OFF.

AUTO.

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!

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.

One or two sequential steps

Betwwen one and four 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.

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.

Fail the pack standby cooling controller.

Decrease airflow to half rate.

Increase airflow through the pack.

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.

False.

True.

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?

Select the FWD and AFT OUTFLOW valve switches to MAN.

Pull the LDG ALT

Push the LDG ALT selector OUT.

Push the LDG ALT selector IN.

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!

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.

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!

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

Correct! Wrong!

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

Pack temperature would cause damage.

Equipment and displays could fail.

Recirculation fans may not cool equipment adequately.

AFT and BULK cargo compartments may overheat.

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!

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

Engine.

Ground cart(s)

APU.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

What protects the fuselage against excessive differential pressure?

Positive and negative pressure relief valves.

Cabin altitude limiter.

Recirculation fans.

Trim air valves

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!

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

9000 feet.

7400 feet.

9400 feet.

8000 feet.

Correct! Wrong!

In flight, the cabin altitude controller operates in:

All statements are correct.

A cruise mode.

A descent mode.

A climb mode.

Correct! Wrong!

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

False.

True.

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!

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 1000 ft.

Assumes a landing altitude of 2000 ft.

Assumes a landing altitude of 200 ft.

Assumes a landing altitude of 1500 ft.

Correct! Wrong!

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

To defog the forward windows.

To prevent smoke from entering the flight deck.

To cool the equipment in the aisle stand.

Correct! Wrong!

When does the ground crew call horn sound?

In case of APU fire.

Before starting the engine.

When cooling of forward electronic electrical equipment is inoperative.

When hydraulics systems are pressurized.

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 departure airport altitude to the nearest 100 feet.

The destination airport altitude to the nearest 500 feet.

The destination airport altitude to the nearest 100 feet.

The alternate airport altitude to the nearest 50 feet.

Correct! Wrong!

How does the trim air system meet zone temperature requirements?

It controls pack air temperature.

It cools or heats conditioned air.

It cools conditioned air.

It heats conditioned air.

Correct! Wrong!

What determines the pack outlet temperature?

The flight deck temperature selector.

All statements are correct.

The CABIN TEMERATURE selector.

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

Correct! Wrong!

Boeing B777 – Air Systems

Quiz

Boeing B777 - Air Systems

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

When is the pack OFF light illuminated amber?

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

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

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

What does the PACK MODE R EICAS message indicate?

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

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

What must be done to manually set a landing altitude?

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

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

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.

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

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

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

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

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

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

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

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

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

What cabin differential pressure is scheduled for takeoff?

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

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

How are cargo compartments controlled in terms of temperature ranges?

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

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

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

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

What is the function of the negative pressure relief vents?

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

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

What is bleed air used for?

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.

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

What system provides the heat for the forward cargo compartment?

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

When is the center bleed isolation valve open?

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.

Which of the following are landing elevation limits for B777?

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

What will cause the automatic closure of a bleed valve?

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

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

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

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

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:

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

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.

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

The LANDING ALTITUDE advisory message indicates which of the following?

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.

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.

What causes the trim air FAULT light to come on?

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

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

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

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

What protects the fuselage against excessive differential pressure?

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).

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

In flight, the cabin altitude controller operates in:

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

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.

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:

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

When does the ground crew call horn sound?

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?

How does the trim air system meet zone temperature requirements?

What determines the pack outlet temperature?

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.