Airbus A350 - Pressurization

In automatic mode (when the CABIN ALT MODE pb-sw and CABIN VS MODE pb-sw are set to AUTO), one Outflow valve Control Unit (OCU) automatically controls the cabin altitude target, and the cabin vertical speed. There are two OCUs. OCU1 computes the cabin pressure targets and provides corresponding commands to OCU2. Both OCUs drive their corresponding outflow valve, more open or closed, in order to reach the demanded pressure target. If one OCU fails the other one takes over the control of the two outflow valves.

False.

True.

Correct! Wrong!

The pressurization descent phase occurs:

Less than 1 min before top of descent if AP and NAV mode are engaged or 1 000 ft below the cruise altitude if AP or NAV mode is not engaged.

Less than 5 min before top of descent if AP and NAV mode are engaged or 1 000 ft below the cruise altitude if AP or NAV mode is not engaged

Less than 3 min before top of descent if AP and NAV mode are engaged or 500 ft below the cruise altitude if AP or NAV mode is not engaged.

Correct! Wrong!

There are two outflow valves:

One is in the forward part of the aircraft and the other one is in the aft part of the aircraft.

Both are located in the aft Left part of the aircraft.

Both are located in the aft Right part of the aircraft.

Correct! Wrong!

The pressurization system is in auto mode. If the LDG ELEVN (landing elevation) indicates 7000 ft, this means:

The pressurization system does not receive valid LDG ELEVN data from the FMS. It is associated with the CAB PRESS LDG ELEVN FAULT ECAM alert

The pressurization system does not receive valid LDG ELEVN data from the FMS or the ISIS. It is associated with the CAB PRESS LDG ELEVN FAULT ECAM alert

The pressurization system does not receive valid LDG ELEVN data from the ISIS. It is associated with the CAB PRESS LDG ELEVN FAULT ECAM alert

Correct! Wrong!

In automatic and manual mode the pressurization system prevents the positive and negative differential pressure from going too high. It also prevents the cabin altitude from going too high. The two outflow valves close when the cabin altitude exceeds _ in automatic mode and _ in manual mode.

14 000 ft and 14 900 ft.

14 000 ft and 16000 ft.

14 000 ft and 15 000 ft.

14 000 ft and 14 700 ft.

Correct! Wrong!

The pressurization abort phase occurs, when:

All answers are correct.

The aircraft altitude is less than 5 000 ft above the aircraft altitude at takeoff.

The aircraft vertical speed is less than +250 ft/minfor 30 s.

The aircraft is at takeoff phase or climb phase.

Correct! Wrong!

If the cabin altitude exceeds _____, the ECAM will trigger the red CAB PRESS EXCESS CAB ALT warning on the WD.

10 000 ft

9 550 ft.

9 700 ft

9 900 ft

Correct! Wrong!

During takeoff, the Cabin Pressure Control System (CPCS) pressurizes the aircraft to provide a smooth variation of the cabin vertical speed at liftoff.

True.

False.

Correct! Wrong!

The manual pressurization system operates independently of the automatic pressurization system. To obtain the desired cabin altitude and vertical speed, the manual pressurization system uses external pressure from:

The ADIRS.

The ISIS (as well as cabin pressure).

The left static port.

The all the static ports.

Correct! Wrong!

At touchdown, all outflow valves open, to remove the residual differential pressure. Residual differential pressure removal takes:

Less than 10 s.

Less than 90 s.

Less than 30 s.

Less than 45 s.

Correct! Wrong!

During automatic operation and before takeoff, all outflow valves close, to ensure there is no differential pressure between the air inside the aircraft and the external air.

True.

False.

Correct! Wrong!

Before takeoff all outflow valve open.

______ all outflow valves open, to ensure there is no differential pressure between the air inside the aircraft and the external air.

When the aircraft is electrically energized.

Before takeoff.

When the aircraft moves under its own power.

When the aircraft lifts off.

Correct! Wrong!

To regulate the cabin pressure the pressurization system has:

Two identical and automatic controllers, two manual controllers, two outflow valves.

Two independent automatic controllers, one manual controller, two outflow valves.

Two identical, independent and automatic controllers, one manual controller, two outflow valves.

Correct! Wrong!

In MANUAL MODE, The cabin vertical speed target has priority over the cabin altitude target.

False.

True.

Correct! Wrong!

A gray arc from 0 fpm to 2 500 fpm appears when the cabin altitude and the cabin vertical speed are both manually controlled, when the cabin vertical speed target is more than the current cabin vertical speed. The gray arc indicates the flight crew the acceptable range to set the cabin vertical speed target. The cabin altitude target has priority over the cabin vertical speed target.

The aircraft is equipped with one negative relief valve, that operates mechanically with differential pressure. The negative relief valve prevents the negative differential pressure from going too high. The negative relief valve is installed on the right side of the forward part of the aircraft, above the flotation line. The negative relief valve mechanically-opens, in order to not exceed the maximum negative differential pressure, which is equal to:

0.900 PSI.

1 PSI.

1.250 PSI.

0.725 PSI.

Correct! Wrong!

During climb, the cabin vertical speed is determined to reach the scheduled cabin altitude at the top of climb defined by the FMS cruise level. The cabin vertical speed is limited to ______.

+ 600 fpm.

+ 700 fpm.

+ 500 fpm.

+ 400 fpm.

Correct! Wrong!

The cabin vertical speed is displayed, when the A/C is in flight. The cabin vertical speed arrow and digital indication pulse in green if:

The cabin vertical speed is more than +1 500 fpm or less than -1 500 fpm.

The cabin vertical speed is more than +1 800 fpm or less than -1 800 fpm.

The cabin vertical speed is more than +1 300 fpm or less than -1 600 fpm.

Correct! Wrong!

The pressurization takeoff phase occurs, when:

All doors are closed and latched, the main landing gear is compressed and engines are at takeoff power.

All doors are closed, at least one landing gear is compressed and thrust levers are above idle.

All doors are closed, at least one landing gear is compressed and engines are at takeoff power.

Correct! Wrong!

If the differential pressure exceeds the maximum limit of the electronic differential pressure protection, the master OCU (Outflow valve Control Unit) is shut off and the remaining OCU takes over control to recover, and opens the two outflow valves. This limit is equal to:

9.20 PSI

9.65 PSI.

8.95 PSI.

9.80 PSI

Correct! Wrong!

During cruise the cabin altitude is regulated to remain:

Above 4000 ft

Below 5 000 ft

Below 7500 ft

Below 6 000 ft.

Correct! Wrong!

The aircraft is pressurized at a rate of ______ : this ensures a differential pressure of 0.1 PSI at liftoff.

– 300 fpm.

+ 350 fpm.

+ 200 fpm.

+ 100 fpm.

Correct! Wrong!

The cabin altitude needle and digital indication pulse in green (except for high altitude airport operations (Landing elevation is more than 8 000 ft), if the cabin altitude is above 8 300 ft, and below 9 550 ft. They stop pulsing, if the cabin altitude goes below 8 100 ft.

False.

True.

Correct! Wrong!

During descent, the cabin vertical speed is controlled, to ensure that the cabin altitude reaches ______ the landing elevation prior to landing.

An altitude slightly above.

A default value of 1 pct. above.

An altitude slightly below.

Correct! Wrong!

During cruise, the cabin altitude is regulated not to exceed:

7 800 ft.

6 500 ft

5 800 ft.

6 000 ft.

Correct! Wrong!

What is the meaning of this indication?

The cabin altitude is in manual mode. The cabin altitude is abnormal: the target is 4000 ft but the cabin altitude is 5000 ft.

The cabin altitude is in automatic mode. The target for cabin altitude is 5000 ft.

The manual cabin altitude mode is ready to be activated. The cabin altitude is abnormal.

The cabin altitude is in manual mode. The cabin altitude is 4000 ft, approaching the target of 5000 ft.

Correct! Wrong!

The cabin vertical speed needle display ranges from:

- 3 000 fpm to + 3 500 fpm.

- 2 500 fpm to + 2 500 fpm.

- 3 000 fpm to + 4 000 fpm.

- 3 500 fpm to + 3 000 fpm.

Correct! Wrong!

When the aircraft is above 25 000 ft, the cabin vertical speed is limited to . When the aircraft is below 25 000 ft, the cabin vertical speed is limited to .

- 300 fpm and - 250 fpm.

- 350 fpm and - 200 fpm.

- 250 fpm and - 300 fpm.

- 300 fpm and - 200 fpm.

Correct! Wrong!

When the Cabin altitude is manually controlled, the cabin altitude must be manually selected via the _____. The cabin altitude target remains at the current value until the flight crew manually selects a new cabin altitude target.

CABIN ALT TRGT selector.

CABIN ALTITUDE selector

CABIN PRESS selector

Correct! Wrong!

When the RAM AIR pb is set to ON, both packs are off, and the differential pressure is less than _____, the system automatically opens the outflow valves to approximately 50 %, to ensure the ventilation of the cockpit and cabin.

2.0 PSI.

1 PSI.

3.5 PSI.

1.5 PSI.

Correct! Wrong!

Which statement is true?

If the differential pressure exceeds the maximum limit of the electronic differential pressure protection, the master OCU is shut off and the remaining OCU takes over control to recover, and opens one outflow valve.

In automatic mode (when the CABIN ALT MODE pb-sw and CABIN VS MODE pb-sw are set to AUTO), one Outflow valve Control Unit (OCU) automatically controls the cabin altitude target.

There are two Outflow valve Control Units (OCUs). OCU1 computes the cabin pressure targets and provides corresponding commands to OCU2. Both OCUs drive their corresponding outflow valve, more open or closed, in order to reach the demanded pressure target. If one OCU fails the other one takes over the control of the two outflow valves.

Correct! Wrong!

In automatic mode (when the CABIN ALT MODE pb-sw and CABIN VS MODE pb-sw are set to AUTO), one Outflow valve Control Unit (OCU) automatically controls the cabin altitude target, and the cabin vertical speed. If the differential pressure exceeds the maximum limit of the electronic differential pressure protection, the master OCU is shut off and the remaining OCU takes over control to recover, and opens the two outflow valves.

In order to automatically control the cabin pressure, each OCU (Outflow valve Control Unit) uses the FMS flight plan (including the landing elevation), together with current outside air pressure, and air conditioning system status (the landing elevation is necessary to be in automatic mode). The OCUs use an internal pressure sensor to determine the cabin differential pressure, and the cabin altitude. The cabin vertical speed is determined via a predetermined scale.

True

False

Correct! Wrong!

In the event the pressurization system fails, one independent overpressure relief valve automatically prevents positive and negative cabin pressure from going too high. This valve is located:

On the Left side of the fuselage besides the rear outflow valve.

Near the APU Gearbox.

In the rear pressure bulkhead.

Correct! Wrong!

When the CABIN ALT MODE pb-sw is set to MAN, the flight crew uses the selector to manually select the cabin altitude target. Selected cabin altitude target is displayed on the CAB PRESS SD page only.

False.

True.

Correct! Wrong!

What is the true statement?

The needle and digital indication pulse in green during final approach, if the differential pressure is more than 1.5 PSI. They stop pulsing, if the differential pressure goes below 1 PSI.

The digital indication pulses in green during final approach, if the differential pressure is more than 1 PSI. They stop pulsing, if the differential pressure goes below 1 PSI.

The needle and digital indication pulse in amber when the landing gear is in the landing position, if the differential pressure is more than 1.5 PSI. They stop pulsing, if the differential pressure goes below 1 PSI.

The needle and digital indication pulse in green when the landing gear lever is selected to down, if the differential pressure is more than 1.5 PSI. They stop pulsing, if the differential pressure goes below 1 PSI.

Correct! Wrong!

The pressurization climb phase stars from the liftoff when:

The Air Data Computer senses a climb

The main landing gear is no longer compressed.

The radio altimeter senses a climb.

Correct! Wrong!

Airbus A350 - Pressurization

Quiz

Airbus A350 - Pressurization

The pressurization descent phase occurs:

There are two outflow valves:

The pressurization system is in auto mode. If the LDG ELEVN (landing elevation) indicates 7000 ft, this means:

The pressurization abort phase occurs, when:

If the cabin altitude exceeds _____, the ECAM will trigger the red CAB PRESS EXCESS CAB ALT warning on the WD.

During takeoff, the Cabin Pressure Control System (CPCS) pressurizes the aircraft to provide a smooth variation of the cabin vertical speed at liftoff.

The manual pressurization system operates independently of the automatic pressurization system. To obtain the desired cabin altitude and vertical speed, the manual pressurization system uses external pressure from:

At touchdown, all outflow valves open, to remove the residual differential pressure. Residual differential pressure removal takes:

During automatic operation and before takeoff, all outflow valves close, to ensure there is no differential pressure between the air inside the aircraft and the external air.

______ all outflow valves open, to ensure there is no differential pressure between the air inside the aircraft and the external air.

To regulate the cabin pressure the pressurization system has:

In MANUAL MODE, The cabin vertical speed target has priority over the cabin altitude target.

During climb, the cabin vertical speed is determined to reach the scheduled cabin altitude at the top of climb defined by the FMS cruise level. The cabin vertical speed is limited to ______.

The cabin vertical speed is displayed, when the A/C is in flight. The cabin vertical speed arrow and digital indication pulse in green if:

The pressurization takeoff phase occurs, when:

If the differential pressure exceeds the maximum limit of the electronic differential pressure protection, the master OCU (Outflow valve Control Unit) is shut off and the remaining OCU takes over control to recover, and opens the two outflow valves. This limit is equal to:

During cruise the cabin altitude is regulated to remain:

The aircraft is pressurized at a rate of ______ : this ensures a differential pressure of 0.1 PSI at liftoff.

The cabin altitude needle and digital indication pulse in green (except for high altitude airport operations (Landing elevation is more than 8 000 ft), if the cabin altitude is above 8 300 ft, and below 9 550 ft. They stop pulsing, if the cabin altitude goes below 8 100 ft.

During descent, the cabin vertical speed is controlled, to ensure that the cabin altitude reaches ______ the landing elevation prior to landing.

During cruise, the cabin altitude is regulated not to exceed:

What is the meaning of this indication?

The cabin vertical speed needle display ranges from:

When the aircraft is above 25 000 ft, the cabin vertical speed is limited to ______. When the aircraft is below 25 000 ft, the cabin vertical speed is limited to ______ .

When the Cabin altitude is manually controlled, the cabin altitude must be manually selected via the _____. The cabin altitude target remains at the current value until the flight crew manually selects a new cabin altitude target.

When the RAM AIR pb is set to ON, both packs are off, and the differential pressure is less than _____, the system automatically opens the outflow valves to approximately 50 %, to ensure the ventilation of the cockpit and cabin.

Which statement is true?

In the event the pressurization system fails, one independent overpressure relief valve automatically prevents positive and negative cabin pressure from going too high. This valve is located:

When the CABIN ALT MODE pb-sw is set to MAN, the flight crew uses the selector to manually select the cabin altitude target. Selected cabin altitude target is displayed on the CAB PRESS SD page only.

What is the true statement?

The pressurization climb phase stars from the liftoff when:

When the aircraft is above 25 000 ft, the cabin vertical speed is limited to . When the aircraft is below 25 000 ft, the cabin vertical speed is limited to .