Boeing B777 - Air Systems

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

When the FWD CARGO FIRE ARM switch is ARMED.

When both supply fans fail in flight.

When high air airflow is detected in flight.

When the EQUIP COOLING switch is in OVRD.

Correct! Wrong!

What cabin differential pressure is scheduled for takeoff?

Slighlty negative.

Equal to the outside pressure.

Slighlty positive.

Zero.

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.

1500 ft and 16 000 ft.

1000 ft and 13 000 ft

1000 ft and 15 000 ft.

2000 ft and 14 000 ft.

Correct! Wrong!

What will cause the automatic closure of a bleed valve?

Engine fire switch pulled.

Ground cart supplying bleed air.

Bleed air overtemp or overpressure.

APU operation

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.

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

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

On the HYD synoptic.

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

On the air synoptic.

Correct! Wrong!

When is the center bleed isolation valve open?

During climb and descent.

During single bleed source operation.

During engine start.

During descent.

Correct! Wrong!

The LANDING ALTITUDE advisory message indicates which of the following?

The preset landing altitude is not correct.

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

A landing was made to different altitude.

Correct! Wrong!

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

9000 feet.

7400 feet.

9400 feet.

8000 feet.

Correct! Wrong!

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

Both packs - upper and lower recirculation systems.

APU bleed air - outflow valves.

Right pack - lower recirculation system.

Left pack - upper recirculation system.

Correct! Wrong!

When does the ground crew call horn sound?

When hydraulics systems are pressurized.

In case of APU fire.

When cooling of forward electronic electrical equipment is inoperative.

Before starting the engine.

Correct! Wrong!

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

In transit.

Full open.

30 degrees open.

Full closed.

Correct! Wrong!

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

Center trim air system.

Both right and left trim air systems.

Right trim air system.

Left trim air system.

Correct! Wrong!

What determines the pack outlet temperature?

The flight deck temperature selector.

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

The CABIN TEMERATURE selector.

All statements are correct.

Correct! Wrong!

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

Forward equipment cooling exhaust air.

An electric heater.

An independent bleed air heating system.

Left recirculation fan.

Correct! Wrong!

Which of the followings are bleed air sources?

Demand pump.

APU and Ground Cart.

Trim air.

Packs.

Correct! Wrong!

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

Airplane climb rate and flight plan cruise altitude.

A constant pressure differential.

Airplane flight altitude.

Airplane flight altitude and pressure altitude.

Correct! Wrong!

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

AUTO or OFF

OFF.

AUTO.

Correct! Wrong!

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

Three packs - providing cooling.

One pack - managing ventilation.

Four packs - controlling pressurization.

Two packs - cooling supplied hot bleed air.

Correct! Wrong!

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

To cool the equipment in the aisle stand.

To prevent smoke from entering the flight deck.

To defog the forward windows.

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.

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

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 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.

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!

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

AFT and BULK cargo compartments may overheat.

Pack temperature would cause damage.

Electronic Equipment and displays may fail.

Recirculation fans may not cool equipment adequately.

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 2000 ft.

Assumes a landing altitude of 1000 ft.

Assumes a landing altitude of 200 ft.

Assumes a landing altitude of 1500 ft.

Correct! Wrong!

How are cargo compartments controlled in terms of temperature ranges?

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

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 5°C to 10°C - High is 20°C to 25°C

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 is bleed air used for?

Pressurizing the hydraulics reservoir.

Pressurizing the hydraulics reservoir and sspirating the TAT probe.

Aspirating the TAT probe.

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!

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

False.

True.

Correct! Wrong!

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

Trim air valves and recirculation fans.

Reciculation fan switches only.

Packs only.

The entire air conditioning system.

Correct! Wrong!

When is the pack OFF light illuminated amber?

When the valve ıs failed closed.

All statements are true.

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

During engine start.

Correct! Wrong!

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

It opens the flight deck trim air valve.

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

The pack temperature decreases.

It cancels input to the flight deck temperature controller.

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.

1000 ft.

1500 ft.

500 ft.

750 ft.

Correct! Wrong!

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

10 000 ft.

15 000 ft.

14 000 ft.

13 500 ft

Correct! Wrong!

What is the function of the negative pressure relief vents?

They improve smoke removal ventilation.

They minimize cabin overpressure conditions.

They regulate cabin pressure during climb.

They prevent negative pressure differential.

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!

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

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

ON.

AUTO.

OFF.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

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

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

Position the landing altitude switch to AUTO.

Advise maintenance of the open valve.

Set cabin altitude to less than 8000 ft.

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.

Select the FWD and AFT OUTFLOW valve switches to MAN.

Pull the LDG ALT

Push the LDG ALT selector IN.

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.

Red light on the air synoptic.

Amber 'M' on the outflow valve indications.

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 EICAS advisory message EQUIP COOLING is displayed.

The backup supply fan operates automatically.

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 protects the fuselage against excessive differential pressure?

Trim air valves

Positive and negative pressure relief valves.

Cabin altitude limiter.

Recirculation fans.

Correct! Wrong!

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.

Correct! Wrong!

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

39 000 ft.

37 000 ft.

33 000 ft.

35 000 ft.

Correct! Wrong!

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

Correct! Wrong!

What must be done to manually set a landing altitude?

Check the FMC for automatic landing elevation adjustment.

Adjust the trim air valves to the desired altitude.

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

Press the AUTO button on the cabin altitude controller

Correct! Wrong!

How does the trim air system meet zone temperature requirements?

It cools conditioned air.

It heats conditioned air.

It controls pack air temperature.

It cools or heats conditioned air.

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 100 feet.

The departure airport altitude to the nearest 100 feet.

The alternate airport altitude to the nearest 50 feet.

The destination airport altitude to the nearest 500 feet.

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 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.

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.

Correct! Wrong!

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

Bleed air pressure is inadequate.

A pack or compressor outlet high temperature has occurred.

The pack valve is failed or closed.

The PACK switched is pushed on.

Correct! Wrong!

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

False.

True

Correct! Wrong!

In flight, the cabin altitude controller operates in:

A climb mode.

A descent mode.

All statements are correct.

A cruise mode.

Correct! Wrong!

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

False.

True.

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!

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 compartment temperature is automatically kept at approximately 21°C.

The bulk cargo compartment ventilation fan operates continuously.

Correct! Wrong!

Which of the following are landing elevation limits for B777?

2000 feet below to 13000 feet above sea level.

1000 feet below to 12000 feet above sea level.

1000 feet below to 14000 feet above sea level.

2000 feet below to 12000 feet above sea level.

Correct! Wrong!

What system provides the heat for the forward cargo compartment?

The trim air system.

Aft cargo heat system.

Exhaust from the equipment cooling system.

Bleed air from the engines.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

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

Ground cart(s)

APU.

Engine.

Correct! Wrong!

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

Equipment and displays could fail.

Pack temperature would cause damage.

Recirculation fans may not cool equipment adequately.

AFT and BULK cargo compartments may overheat.

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.

True.

False.

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!

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 OFF and LDG ALT selector pushed IN.

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

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

Correct! Wrong!

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

Packs operate at reduced flow rate.

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.

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

Correct! Wrong!

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

Increase airflow through the pack.

Fail the pack standby cooling controller.

Shutoff the pack.

Decrease airflow to half rate.

Correct! Wrong!

What causes the trim air FAULT light to come on?

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

The trim air valve is commanded open

All statements are correct.

The pack flow control valves are commanded closed.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

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

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

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

Left trim air valve - monitored through the engine display.

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

Right trim air valve - monitored through the air synoptic.

Correct! Wrong!

Boeing B777 – Air Systems

Quiz

Boeing B777 - Air Systems

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

What cabin differential pressure is scheduled for takeoff?

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.

What will cause the automatic closure of a bleed valve?

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:

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

When is the center bleed isolation valve open?

The LANDING ALTITUDE advisory message indicates which of the following?

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

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

When does the ground crew call horn sound?

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

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

What determines the pack outlet temperature?

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

Which of the followings are bleed air sources?

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

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

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

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

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

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

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

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

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:

How are cargo compartments controlled in terms of temperature ranges?

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 is bleed air used for?

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).

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

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

When is the pack OFF light illuminated amber?

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

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.

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

What is the function of the negative pressure relief vents?

What does the PACK MODE R EICAS message indicate?

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

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

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

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

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

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 protects the fuselage against excessive differential pressure?

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

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

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

What must be done to manually set a landing altitude?

How does the trim air system meet zone temperature requirements?

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?

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.

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

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

In flight, the cabin altitude controller operates in:

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

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

Which of the following are landing elevation limits for B777?

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.

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

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

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.

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

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

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

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

What causes the trim air FAULT light to come on?

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

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

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.