Boeing 737NG – Air Systems - SmartCockpit - Airline training guides, Aviation, Operations, Safety

An amber AUTOFAIL indication will illuminate if one or more of the following conditions occur:

Loss of AC power for more than 15 seconds. Main outflow valve DC motor fails or if the cabin altitude exceeds 13,875 ft.

A single controller failure when the 'ALTN' light is also illuminated.

The cabin altitude exceeds 13,875 ft with the loss of AC power.

The cabin altitude exceeds 10,000 ft.

Correct! Wrong!

If all zone and primary pack controls fail, how is cabin temperatures controlled?

The standby pack controls command the packs to produce the average temperature demand of the 2 passenger cabin zones.

A fixed cabin temperature will be produced in this situation 24 deg.C (75 deg.F) from the left pack, and 18 deg.C (64 deg.F) from the right pack.

The cabin temperatures cannot be controlled in this situation.

The last settings before the failure will be maintained until the packs are selected OFF.

Correct! Wrong!

Zone Temperature Control - There are three zones: flight deck (CONT CAB), forward passenger cabin (FWD CAB) and aft passenger cabin (AFT CAB). Desired zone temperature is set by adjusting the individual Temperature Selectors. The selector range is approximately:

16 deg.C (61 deg.F) (18°C) to 25 deg.C (77 deg.F).

17 deg.C (63 deg.F) (18°C) to 26 deg.C (79 deg.F).

18 deg.C (65 deg.F) (18°C) to 30 deg.C (85 deg.F).

19 deg.C (66 deg.F) (18°C) to 29 deg.C (84 deg.F).

Correct! Wrong!

If all Temperature Selectors are positioned OFF, the pack controls will cause the left pack to maintain a fixed temperature of and the right pack to maintain as measured at the pack temperature sensor.

20 deg.C (68 deg.F) and 18 deg.C (65 deg.F)

17 deg.C (65 deg.F) and 24 deg.C (72 deg.F)

18 deg.C (65 deg.F) and 22 deg.C (72 deg.F)

24 deg.C (75 deg.F) and 18 deg.C (65 deg.F)

Correct! Wrong!

How many Trim Air Pressure Regulators are there in the Air Conditioning system?

There are no Trim Air Pressure Regulators, only Trim Air Modulating valves.

One.

Three.

Two.

Correct! Wrong!

The ram air system deflector doors:

Extend during slow flight when flaps are not retracted.

Extend on the ground only.

Are always extended when the gear is down.

Modulate between fully extended and retracted through the entire flight.

Correct! Wrong!

A DUCT OVERHEAT light only will cause:

The temperature mix valves to drive full cold.

A BLEED TRIP OFF.

An automatic shutdown of the pack.

The temperature mix valves to drive full hot.

Correct! Wrong!

The air data inertial reference units (ADIRUs) provides ambient static pressure,baro corrected altitude, non corrected altitude and calibrated airspeed to bothautomatic controllers. The ADIRUs receive barometric corrections from the Captain's and First Officer's BARO reference selectors. The automatic controllers also receive:

Throttle position from both stall management computers and signals from the IRS.

Throttle position from both stall management computers and signals from the air-ground sensors.

Throttle position from both stall management computers.

Throttles position and signals from the IRS.

Correct! Wrong!

A ZONE TEMP light may be reset by the trip reset switch on the Bleed Panel.

False. This reset switch is for BLEED TRIP OFF only.

True.

False. This reset switch is only for PACK and BLEED TRIP OFF resets.

False. This reset is only for resetting a PACK trip.

Correct! Wrong!

The recirculation fan system circulates air from the passenger cabin around thelining of the forward cargo compartment. When the overboard exhaust valve isclosed, exhaust air from the equipment cooling system is also diffused to the lining of the aft cargo compartment for additional inflight heating.

True.

False.

Correct! Wrong!

Forward cargo compartment only.

An illuminated BLEED TRIP OFF light indicates:

Too high temperature in bleed air duct and bleed air valve stays closes.

Too high temperature in bleed air duct and bleed air valve stays open.

Too high pressure in bleed air duct and bleed air valve stays open.

Too high temperature or pressure in bleed air duct and bleed air valve stays closes.

Correct! Wrong!

What is the flight level limitation for DISPATCH with one pack INOP?

FL410.

FL100.

FL180.

FL250.

Correct! Wrong!

Where is the forward outflow valve located?

Forward of the left hand air conditioning inlet.

Forward of the right hand air conditioning inlet.

There is no forward outflow valve.

In the nose landing gear bay.

Correct! Wrong!

Automatic switching to 'high air flow' occurs if both engine bleed air switches are OFF and the APU bleed air switch is ON, regardless of flap position, air-ground status or number of packs operating.

True.

False.

Correct! Wrong!

The altitude warning horn is:

An intermittent warning horn accompanied by a Master Caution warning.

A continuous warning horn.

A continuous warning horn accompanied by a Master Caution warning.

An intermittent warning horn.

Correct! Wrong!

What systems need pneumatic power for operation?

Wing anti-ice, APU and engine starting.

Engine starting, air conditioning, pressurization, wing and engine anti-ice, hydraulic reservoirs and water tank pressurization.

APU, engine starting, air Conditioning and pressurization.

Air Conditioning, pressurization, wing anti-ice and APU.

Correct! Wrong!

The amount of fan air that is ducted through the pre-cooler is controlled by the:

Thermostatic pre-cooler valve.

Modulating and shut-off valve.

Ram air controller

Correct! Wrong!

The cabin will automatically pressurize to 0.125 PSID on the ground when:

When the aircraft goes into the air mode of the air-ground sensor.

When the PSEU is activated.

Engine thrust is increased towards takeoff thrust.

When the aircraft goes into the ground mode of the air-ground sensor.

Correct! Wrong!

A leak in the APU Bleed Air Duct will be indicated by:

Right WING‐BODY OVERHEAT light illuminated.

Left WING‐BODY OVERHEAT light illuminated

Left and Right WING‐BODY OVERHEAT lights illuminated.

APU BLEED light illuminated on overhead panel

Correct! Wrong!

The motorized Exhaust valve:

Serves as backup to the outflow valve if the outflow valve fails.

Allows for increased ventilation in the smoke removal configuration.

Is normally open in pressurized flights above 8,000 feet.

All statements are correct.

Correct! Wrong!

The TRIP RESET switch is pushed to reset a PACK, WING-BODY OVERHEAT and BLEED TRIP OFF, it isolates the associated valve and extinguishes the alert.

False.

True.

Correct! Wrong!

Due to a malfunction you are required to return to the airport of departure. To avoid the OFF SCHED DESCENT warning you reset the FLT ALT. What can you expect?

The pressurization will increase its ventilation and possibly pressurization will be lost

Nothing will happen and you will still get the OFF SCHED DESCENT warning.

The system will be recalculating the pressurization for the departure airport

The automatic abort capability for the departure airport is lost

Correct! Wrong!

The recirculation fans:

Provide overheat detection downstream of the packs.

Are driven by a DC motor.

Increase airflow at greater cabin differential pressures.

Reduce air conditioning pack load.

Correct! Wrong!

The DUAL BLEED light is illuminated. Engine thrust:

Should be limited to 40% N1.

Is unlimited. Dual bleed light is advisory only.

Should be limited to idle.

Correct! Wrong!

The differential pressure of the cabin is limited by a pressure relief system - which of the following statements is correct?

There are two pressure relief valves which limit differential pressure to 9.1 psi.

There is a negative pressure relief valve, which limits the cabin pressure to 9.1 psi above ambient.

There are two negative pressure relief valves, which limit the cabin pressure to 9.1 psi above ambient.

There is an outflow valve which opens when cabin pressure reaches 9.1 psi above ambient.

Correct! Wrong!

What is the primary source of conditioned air for the cockpit?

The right pack.

The left pack.

Both packs.

Ground air.

Correct! Wrong!

Cabin altitude is normally rate-controlled by the cabin pressure controller up to a cabin altitude of feet at the airplane maximum certified ceiling of feet.

7 500 ft and 41 000 ft.

10 000 ft and 41 000 ft.

8 000 ft and 41 000 ft.

12 000 ft and 41 000 ft.

Correct! Wrong!

When does the amber DUAL BLEED Light illuminate?

When the APU bleed valve is open and the No.1 engine bleed switch is ON.

When the APU bleed valve is open, the No.2 engine bleed switch is ON and the isolation valve is closed.

When the APU bleed valve is open.

When the APU bleed valve is open and the No.1 engine bleed switch is OFF.

Correct! Wrong!

The right WING-BODY OVERHEAT light is illuminated, what area is affected?

APU bleed duct.

Right engine strut.

The keel beam.

Left aircond bay.

Correct! Wrong!

Overheat detection is provided by temperature sensors located:

Downstream of the packs and the mix manifold.

Downstream of the packs.

Downstream of the packs, the trim air valve and the mix manifold.

In the mix manifold.

Correct! Wrong!

While taxiing in, the controller drives the outflow valve slowly to the full open position depressurizing the cabin.

True.

False.

Correct! Wrong!

What is the position of the isolation valve when the ISOLATION VALVE switch is in AUTO?

Open when any Engine Bleed Air switch or Air Conditioning pack switch is positioned OFF.

The isolation valve automatically modulates between open & closed, depending on pneumatic load.

The isolation valve is always open

The isolation valve is always closed.

Correct! Wrong!

If a PACK light can be reset by the TRIP RESET switch then:

The fault was caused by an overheat trip.

The pack should be selected off as per the QRH.

The fault was caused by a controller fault.

The fault was caused by an overheat trip or by a controller fault.

Correct! Wrong!

In MANUAL pressurization mode the outflow is driven by?

A motor supplied from DC bus 1.

A motor supplied from DC standby bus.

Requires AC power from transfer bus 1.

A motor supplied from DC bus 2.

Correct! Wrong!

One PACK light illuminates on recall only. What does it indicate?

The primary pack control has failed and the pack is now controlled by the standby pack control

There is a FOD in the RAM AIR intake forcing the pack to shut down.

Both temperature control valves have shut closed in the affected pack.

Both primary and secondary pack controls have failed.

Correct! Wrong!

Deflector doors are installed forward of the ram air inlet doors to prevent slush ingestion prior to liftoff and after touchdown. Deflector doors extend when activated:

Hydraulically when extended the main landing gear

Pneumatically.

Electrically in the air and pneumatically on ground

Electrically by the air-ground safety sensor

Correct! Wrong!

Cabin air outflow is controlled by the outflow valve and the overboard exhaustvalve. A small amount is also exhausted through toilet and galley vents, miscellaneous fixed vents, and by seal leakage.

False.

True.

Correct! Wrong!

If all zone controls and primary pack controls fail, the standby pack controlscommand the packs to produce air temperatures which will satisfy the averagetemperature demand of the two cabin zones. The trim air modulating valves will:

Close.

Open.

Correct! Wrong!

With a ground pneumatic source connected and the isolation valve switch selected to CLOSE.

The pneumatic pressure would be indicated by the left hand pointer on the pneumatic duct pressure indicator.

The pneumatic pressure would be indicated by both the left and right pointers on the pneumatic duct pressure indicator.

The pneumatic pressure would be indicated by the right hand pointer on the pneumatic duct pressure indicator.

Correct! Wrong!

The APU is capable of supplying bleed air for two packs on the ground, or one pack in flight.

False.

True.

Correct! Wrong!

When pressing Master Caution Recall the CONT CAB amber ZONE TEMP light illuminates.

This indicates one PACK has overheated and has to be reset by pushing the trip reset button.

This indicates that both temperature controllers will regulate the temperature to a preset value.

This indicates a failure of both the primary and standby temperature control systems.

Due to failure of the primary flight deck temperature control, automatic switching to the backup system has occurred.

Correct! Wrong!

When operating on the Standby Pack Controls, what temperatures will the packs be producing?

The flight deck required temperature will also be provided to the passenger cabin.

The trim air modulating valves close so no pack air is provided to the two cabin zones, only re-circulated air is provided.

An average temperature for the two cabin zones.

Left pack produces 18 deg.C (64 deg.F) , right pack produces 22 deg.C (72 deg.F).

Correct! Wrong!

Where do the AUTO mode controllers receive their barometric information from?

The two pitot static systems.

The ADIRUs.

The FO's pitot static system.

The captain's pitot static system.

Correct! Wrong!

The amber DUAL BLEED light indicates apossible APU back pressure condition and thrust must be limited to IDLE.

False.

True.

Correct! Wrong!

Engine bleed air is obtained from:

4th and 9th stage of the compressor section.

5th and 8th stage of the compressor section.

4th and 8th stage of the compressor section.

5th and 9th stage of the compressor section.

Correct! Wrong!

How are the Engine Bleed Air valves powered?

They are pneumatically activated and AC operated.

They are DC activated and pneumatically operated.

They are pneumatically activated and DC operated.

They are AC activated and pneumatically operated.

Correct! Wrong!

Takeoff is allowed with Pack switches in HIGH, but landing is not permitted:

True.

False.

Correct! Wrong!

The ram air system provides cooling air for the:

Cargo area and packs.

Packs

Heat exchangers.

Cargo area.

Correct! Wrong!

Loss of airflow due to failure of an equipment cooling fan results in illumination of the related equipment cooling OFF light. Selecting the alternate fan should restore airflow and extinguish the OFF light within approximately _____.

5 seconds.

60 seconds.

3 minutes.

20 seconds.

Correct! Wrong!

The 9th stage modulating and shut-off valve:

Will open if the APU is insufficient in maintaining proper pressure.

Will open if the 5th stage air is insufficient in maintaining proper pressure.

Is open at all times irrespective of 5th stage air pressure output.

Correct! Wrong!

The cabin pressure controller controls cabin pressure in the following modes: AUTO (automatic) - ALT (alternate) - MAN (manual).

Automatic mode uses AC motor while the two other modes use DC motor.

Automatic and alternate modes use AC motor while the manual mode use DC motor.

All three modes use DC motor.

All three modes use AC motor.

Correct! Wrong!

What are the causes of an amber AUTO FAIL light?

Excessive rate of cabin pressure change or high cabin altitude (above 15,800 ft).

Loss of DC power or controller fault.

Outflow valve control fault or excessive differential pressure.

All statements are correct.

Correct! Wrong!

During descent when the descent mode is activated:

Aircraft descends 0.50 below the selected FLT ALT.

Aircraft descends 0.25 psi below the selected FLT ALT.

Aircraft descends 0.25 psi below the selected LAND ALT.

Aircraft descends 0.50 psi below the selected LAND ALT.

Correct! Wrong!

The amber DUAL BLEED Light is illuminated before starting engines. What should you do?

Do not start the engines, check MEL.

Shut down the APU and use a pneumatic ground cart for engine start.

Nothing. This is normal condition before engine start.

Do not start the engines, call Maintenance.

Correct! Wrong!

In cruise the air conditioning ram air doors are:

Modulate as a function of airspeed.

Fully open.

Modulate between open and closed as required for pack temperature control.

Fully closed.

Correct! Wrong!

Engine bleed air pressure is controlled by means of the bleed air valve which acts as both a shutoff and pressure regulating valve.

False.

True.

Correct! Wrong!

The amber OFF SCHEDULE DESCENT light illuminates. What does it indicate?

The aircraft has descended before reaching the planned cruise altitude set in the altitude window.

The pressurization standby controller has failed and will automatically shift to STANDBY.

The main pressurization controller is unable to maintain pressurization and has to be manually shift to manual.

The pressurisation controller has failed and will automatically shift to manual.

Correct! Wrong!

The AUTO mode is active. The amber AUTO FAIL light illuminates when:

The pressurization controller is moved to ALTN.

Correct! Wrong!

The isolation valve is:

AC controlled and pneumatically operated.

DC operated.

AC operated.

Correct! Wrong!

Where are the bleed trip sensors installed?

On the 9th Stage bleed air line.

On the engine side of the engine bleed air valve.

Sensors are positioned on both sides of the engine bleed air valve.

On the bleed air duct prior to the pack valve.

Correct! Wrong!

Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT selector during preflight, but subsequently the aircraft climbed to FL390.

A differential pressure of 9.1 psi is maintained by the positive pressure relief valve.

A differential pressure of 6.1 psi is maintained by the positive and the negative pressure relief valves.

A differential pressure of 8.35 psi is maintained by the forward outflow valve

A differential pressure of 7.45 psi is maintained by the negative pressure relief valve.

Correct! Wrong!

What happens to engine fan air that is used to cool engine bleed air?

It is ducted into the 5th stage compressor section.

It is discharged overboard.

It is ducted into the pneumatic manifold.

It is ducted into the crossbleed manifold.

Correct! Wrong!

Water tank pressurisation in flight is normally provided by:

5th and 9th stage air from the No. 1 engine.

Bleed air from the APU.

5th and 9th stage air from the No. 2 engine.

Correct! Wrong!

What causes the amber PACK TRIP OFF Light to illuminate?

All statements are correct.

Main distribution duct temperature has exceeded limits.

Compressor outlet duct temperature has exceeded limits

Turbine inlet duct temperature has exceeded limits.

Correct! Wrong!

When will the descent mode be activated in the pressurization system?

When descending 0.25psi below the selected flight altitude.

When within 15 000 feet of the landing airport.

When retard is announced in the FMA.

When TD is reached.

Correct! Wrong!

If any individual zone is switched OFF, the Temperature Selector setting will be ignored by the temperature control system.

False.

True.

Correct! Wrong!

Where are the wing-body overheat sensors located?

Engine struts, wing inboard leading edges, air conditioning bays, APU bleed duct, keel beam.

Engine struts, wing leading edge slats, air conditioning bays, APU duct, keel beam.

Engine cowling lips, wing leading edge slats, air conditioning bays, APU compartment, keel beam.

Engine cowl lips, wing leading edge slats, air conditioning bays, electronic equipment bay, APU bleed duct.

Correct! Wrong!

During preflight procedure the trim air switch is left in the OFF position and only one pack is selected ON for air conditioning. What is the consequence?

During single pack operation the zone temperature is controlled the same as during two pack operation.

If a passenger cabin zone trim air, or all trim air is lost, the forward and aft zone temperature demands will be averaged for control of the left pack.

Since the trim air is off both packs will average the temperature that satisfies the zone which requires the most cooling

With the TRIM AIR selected OFF, the pack attempts to produce an air temperature to satisfy the average temperature demands of all three zones.

Correct! Wrong!

What is the purpose of the recirculation fans?

To increase the pressure in the cabin.

To operate as air mixers in the mix manifold.

If increased smoke removal is required.

To decrease the air conditioning system pack load.

Correct! Wrong!

Illumination of the amber BLEED TRIP OFF light indicates what valve has automatically closed?

Isolation valve.

Modulating and Shutoff valve.

Engine Bleed Air valve.

5th valve of the compressor section.

Correct! Wrong!

The maximum differential pressure is:

8.65 psi.

9.10 psi.

7.90 psi.

8.45 psi.

Correct! Wrong!

The wing-body overheat light comes on. What is the related master caution warning?

OVERHEAD.

As the light is in the proximity of the pilot’s perception there is no master caution for this condition.

AIR COND.

OVHT DET.

Correct! Wrong!

From where does the Cabin Auto Controller get its inputs.

From the Captain’s CDU.

From the static ports.

From the EFIS control panel.

From the ADIRUs.

Correct! Wrong!

APU bleed air used to start NO.1 engine is:

Routed via the No. 1 engine bleed air valve to the No.1 engine starter valve.

Routed direct to the No.1 engine starter valve.

Controlled by the modulating and shut-off valve.

Correct! Wrong!

Conditioned air from the left hand pack flows directly to the flight deck from the Mix Manifold.

True.

False.

Correct! Wrong!

When both the AUTO FAIL light and the ALTN light illuminate:

Pressurization has automatically switched to the opposite automatic controller.

Pressurization has automatically switched to the ALTN system.

Pressurization has automatically switched to the MAN system.

Correct! Wrong!

Cruising at FL 370. The motorized Overboard Exhaust valve will open if:

Both pack switches are in AUTO and recirculation fan is OFF.

Both pack switches are in HIGH and recirculation fan is ON.

Both pack switches are in AUTO and recirculation fan is ON.

Either pack switches are in HIGH and recirculation fan is OFF.

Correct! Wrong!

The pneumatic duct pressure gauge:

Indicates pressure in left and right pneumatic ducts.

Is DC powered.

Indicates pressure available for engine anti-icing.

Correct! Wrong!

The packs produce the coolest temperature selected in any of the zones, with the other zones temperature controlled by adding hot trim air to produce the required temperature.

True.

False.

Correct! Wrong!

What happens when the WING BODY OVHT TEST switch is pressed?

The amber WING-BODY OVERHEAT Lights illuminate.

All statements are correct.

The amber BLEED TRIP OFF Lights illuminate.

The amber PACK TRIP OFF Lights illuminate.

Correct! Wrong!

Boeing 737NG – Air Systems

Boeing 737NG – Air Systems

An amber AUTOFAIL indication will illuminate if one or more of the following conditions occur:

If all zone and primary pack controls fail, how is cabin temperatures controlled?

Zone Temperature Control - There are three zones: flight deck (CONT CAB), forward passenger cabin (FWD CAB) and aft passenger cabin (AFT CAB). Desired zone temperature is set by adjusting the individual Temperature Selectors. The selector range is approximately:

If all Temperature Selectors are positioned OFF, the pack controls will cause the left pack to maintain a fixed temperature of ____ and the right pack to maintain ____ as measured at the pack temperature sensor.

How many Trim Air Pressure Regulators are there in the Air Conditioning system?

The ram air system deflector doors:

A DUCT OVERHEAT light only will cause:

A ZONE TEMP light may be reset by the trip reset switch on the Bleed Panel.

An illuminated BLEED TRIP OFF light indicates:

What is the flight level limitation for DISPATCH with one pack INOP?

Where is the forward outflow valve located?

Automatic switching to 'high air flow' occurs if both engine bleed air switches are OFF and the APU bleed air switch is ON, regardless of flap position, air-ground status or number of packs operating.

The altitude warning horn is:

What systems need pneumatic power for operation?

The amount of fan air that is ducted through the pre-cooler is controlled by the:

The cabin will automatically pressurize to 0.125 PSID on the ground when:

A leak in the APU Bleed Air Duct will be indicated by:

The motorized Exhaust valve:

The TRIP RESET switch is pushed to reset a PACK, WING-BODY OVERHEAT and BLEED TRIP OFF, it isolates the associated valve and extinguishes the alert.

Due to a malfunction you are required to return to the airport of departure. To avoid the OFF SCHED DESCENT warning you reset the FLT ALT. What can you expect?

The recirculation fans:

The DUAL BLEED light is illuminated. Engine thrust:

The differential pressure of the cabin is limited by a pressure relief system - which of the following statements is correct?

What is the primary source of conditioned air for the cockpit?

Cabin altitude is normally rate-controlled by the cabin pressure controller up to a cabin altitude of ____ feet at the airplane maximum certified ceiling of ____feet.

When does the amber DUAL BLEED Light illuminate?

The right WING-BODY OVERHEAT light is illuminated, what area is affected?

Overheat detection is provided by temperature sensors located:

While taxiing in, the controller drives the outflow valve slowly to the full open position depressurizing the cabin.

What is the position of the isolation valve when the ISOLATION VALVE switch is in AUTO?

If a PACK light can be reset by the TRIP RESET switch then:

In MANUAL pressurization mode the outflow is driven by?

One PACK light illuminates on recall only. What does it indicate?

Deflector doors are installed forward of the ram air inlet doors to prevent slush ingestion prior to liftoff and after touchdown. Deflector doors extend when activated:

Cabin air outflow is controlled by the outflow valve and the overboard exhaustvalve. A small amount is also exhausted through toilet and galley vents, miscellaneous fixed vents, and by seal leakage.

If all zone controls and primary pack controls fail, the standby pack controlscommand the packs to produce air temperatures which will satisfy the averagetemperature demand of the two cabin zones. The trim air modulating valves will:

With a ground pneumatic source connected and the isolation valve switch selected to CLOSE.

The APU is capable of supplying bleed air for two packs on the ground, or one pack in flight.

When pressing Master Caution Recall the CONT CAB amber ZONE TEMP light illuminates.

When operating on the Standby Pack Controls, what temperatures will the packs be producing?

Where do the AUTO mode controllers receive their barometric information from?

The amber DUAL BLEED light indicates apossible APU back pressure condition and thrust must be limited to IDLE.

Engine bleed air is obtained from:

How are the Engine Bleed Air valves powered?

Takeoff is allowed with Pack switches in HIGH, but landing is not permitted:

The ram air system provides cooling air for the:

Loss of airflow due to failure of an equipment cooling fan results in illumination of the related equipment cooling OFF light. Selecting the alternate fan should restore airflow and extinguish the OFF light within approximately _____.

The 9th stage modulating and shut-off valve:

The cabin pressure controller controls cabin pressure in the following modes: AUTO (automatic) - ALT (alternate) - MAN (manual).

What are the causes of an amber AUTO FAIL light?

During descent when the descent mode is activated:

The amber DUAL BLEED Light is illuminated before starting engines. What should you do?

In cruise the air conditioning ram air doors are:

Engine bleed air pressure is controlled by means of the bleed air valve which acts as both a shutoff and pressure regulating valve.

The amber OFF SCHEDULE DESCENT light illuminates. What does it indicate?

The AUTO mode is active. The amber AUTO FAIL light illuminates when:

The isolation valve is:

Where are the bleed trip sensors installed?

Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT selector during preflight, but subsequently the aircraft climbed to FL390.

What happens to engine fan air that is used to cool engine bleed air?

Water tank pressurisation in flight is normally provided by:

What causes the amber PACK TRIP OFF Light to illuminate?

When will the descent mode be activated in the pressurization system?

If any individual zone is switched OFF, the Temperature Selector setting will be ignored by the temperature control system.

Where are the wing-body overheat sensors located?

During preflight procedure the trim air switch is left in the OFF position and only one pack is selected ON for air conditioning. What is the consequence?

What is the purpose of the recirculation fans?

Illumination of the amber BLEED TRIP OFF light indicates what valve has automatically closed?

The maximum differential pressure is:

The wing-body overheat light comes on. What is the related master caution warning?

From where does the Cabin Auto Controller get its inputs.

APU bleed air used to start NO.1 engine is:

Conditioned air from the left hand pack flows directly to the flight deck from the Mix Manifold.

When both the AUTO FAIL light and the ALTN light illuminate:

Cruising at FL 370. The motorized Overboard Exhaust valve will open if:

The pneumatic duct pressure gauge:

The packs produce the coolest temperature selected in any of the zones, with the other zones temperature controlled by adding hot trim air to produce the required temperature.

What happens when the WING BODY OVHT TEST switch is pressed?

If all Temperature Selectors are positioned OFF, the pack controls will cause the left pack to maintain a fixed temperature of and the right pack to maintain as measured at the pack temperature sensor.

Cabin altitude is normally rate-controlled by the cabin pressure controller up to a cabin altitude of feet at the airplane maximum certified ceiling of feet.