Boeing B737 MAX - Air Systems

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

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

Correct! Wrong!

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

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

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

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

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

Correct! Wrong!

When does the amber DUAL BLEED Light illuminate?

When the APU bleed valve is open.

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

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

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

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?

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.

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

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

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

Correct! Wrong!

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

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.

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.

Correct! Wrong!

The maximum differential pressure is:

7.90 psi.

9.10 psi.

8.65 psi.

8.45 psi.

Correct! Wrong!

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

Left and Right WING BODY OVERHEAT lights illuminated.

Right WING BODY OVERHEAT light illuminated.

Left WING BODY OVERHEAT light illuminated

APU BLEED light illuminated on overhead panel

Correct! Wrong!

The DUAL BLEED light is illuminated. Engine thrust:

Is unlimited. Dual bleed light is advisory only.

Should be limited to 40% N1.

Should be limited to idle.

Correct! Wrong!

The ram air system deflector doors:

Extend on the ground only.

Are always extended when the gear is down.

Modulate between fully extended and retracted through the entire flight.

Extend during slow flight when flaps are not retracted.

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.

10 000 ft and 41 000 ft.

7 500 ft and 41 000 ft.

12 000 ft and 41 000 ft.

8 000 ft and 41 000 ft.

Correct! Wrong!

Water tank pressurisation in flight is normally provided by:

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

Bleed air from the APU.

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

Correct! Wrong!

Duct pressure splits soon after landing.

This is an abnormal condition that shall be reported to maintenance.

This is a self test of the PRSOV solenoid to close the valve, independent of the torque motor.

This is an abnormal situation caused by a solenoid defect. It shall be reported to the maintenance.

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.

The motorized Exhaust valve:

Allows for increased ventilation in the smoke removal configuration.

All statements are correct.

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

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

Correct! Wrong!

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

The cabin temperatures cannot be controlled in this situation.

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

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.

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:

Electrically by the air-ground safety sensor

Hydraulically when extended the main landing gear

Pneumatically.

Electrically in the air and pneumatically on ground

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!

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

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

An average temperature for the two cabin zones.

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

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

Correct! Wrong!

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

The pressurization controller is moved to ALTN.

Correct! Wrong!

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

Ram air controller

Thermostatic pre-cooler valve.

Modulating and shut-off valve.

Correct! Wrong!

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

The isolation valve is always open

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

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

The isolation valve is always closed.

Correct! Wrong!

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

When the PSEU is activated.

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

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

Engine thrust is increased towards takeoff thrust.

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 ducted into the pneumatic manifold.

It is ducted into the crossbleed manifold.rn

It is discharged overboard.

Correct! Wrong!

A DUCT OVERHEAT light only will cause:

The temperature mix valves to drive full cold.

The temperature mix valves to drive full hot.

A BLEED TRIP OFF.

An automatic shutdown of the pack.

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.

False.

True.

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 7.45 psi is maintained by the negative pressure relief valve.

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

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.

Correct! Wrong!

The ram air system provides cooling air for the:

Cargo area and packs.

Heat exchangers.

Cargo area.

Packs

Correct! Wrong!

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

Two.

One.

Three.

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

Correct! Wrong!

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

Controlled by the modulating and shut-off valve.

Routed direct to the No.1 engine starter valve.

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

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!

The altitude warning horn is:

A continuous warning horn.

A continuous warning horn accompanied by a Master Caution warning.

An intermittent warning horn accompanied by a Master Caution warning.

An intermittent warning horn.

Correct! Wrong!

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

The keel beam.

Left aircond bay.

APU bleed duct.

Right engine strut.

Correct! Wrong!

Overheat detection is provided by temperature sensors located:

Downstream of the packs and the mix manifold.

In the mix manifold.

Downstream of the packs.

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

Correct! Wrong!

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

Pressurization has automatically switched to the ALTN system.

Pressurization has automatically switched to the opposite automatic controller.

Pressurization has automatically switched to the MAN system.

Correct! Wrong!

Illumination of the BLEED light indicates:

Excessive engine bleed air temperature OR pressure.

Excessive engine bleed air temperature, over-pressure OR under-pressure.

Excessive engine bleed air temperature, over-pressure or under-pressure OR a failure within the bleed air system OR an incorrect bleed air configuration after takeoff or go-around.

Correct! Wrong!

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

All three modes use DC motor.

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

All three modes use AC motor.

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

Correct! Wrong!

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

Modulating and Shutoff valve.

5th valve of the compressor section.

Isolation valve.

Engine Bleed Air valve.

Correct! Wrong!

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

The captain's pitot static system.

The ADIRUs.

The FO's pitot static system.

The two pitot static systems.

Correct! Wrong!

What is the purpose of the recirculation fans?

To increase the pressure in the cabin.

To decrease the air conditioning system pack load.

To operate as air mixers in the mix manifold.

If increased smoke removal is required.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

In cruise the air conditioning ram air doors are:

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

Modulate as a function of airspeed.

Fully closed.

Fully open.

Correct! Wrong!

Where are the wing-body overheat sensors located?

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

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.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

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

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

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

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

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

Correct! Wrong!

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

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, check MEL.

Do not start the engines, call Maintenance.

Correct! Wrong!

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

All statements are correct.

The amber BLEED TRIP OFF Lights illuminate.

The amber WING-BODY OVERHEAT Lights illuminate.

The amber PACK TRIP OFF Lights illuminate.

Correct! Wrong!

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

AIR COND.

OVERHEAD.

OVHT DET.

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

Correct! Wrong!

Where is the forward outflow valve located?

In the nose landing gear bay.

Forward of the left hand air conditioning inlet.

There is no forward outflow valve.

Forward of the right hand air conditioning inlet.

Correct! Wrong!

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

Ground air.

Both packs.

The right pack.

The left pack.

Correct! Wrong!

During descent when the descent mode is activated:

Aircraft descends 0.50 below the selected FLT ALT.

Aircraft descends 0.50 psi below the selected LAND ALT.

Aircraft descends 0.25 psi below the selected LAND ALT.

Aircraft descends 0.25 psi below the selected FLT ALT.

Correct! Wrong!

In MANUAL pressurization mode the outflow is driven by?

Requires AC power from transfer bus 1.

A motor supplied from DC standby bus.

A motor supplied from DC bus 1.

A motor supplied from DC bus 2.

Correct! Wrong!

What systems need pneumatic power for operation?

Wing anti-ice, APU and engine starting.

APU, engine starting, air Conditioning and pressurization.

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

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

Correct! Wrong!

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

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.

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

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 automatic abort capability for the departure airport is lost

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

Correct! Wrong!

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

When within 15 000 feet of the landing airport.

When retard is announced in the FMA.

When TD is reached.

When descending 0.25psi below the selected flight altitude.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

Where are the bleed trip sensors installed?

On the engine side of the engine bleed air valve.

On the bleed air duct prior to the pack valve.

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

On the 9th Stage bleed air line.

Correct! Wrong!

From where does the Cabin Auto Controller get its inputs.

From the static ports.

From the Captain's CDU.

From the EFIS control panel.

From the ADIRUs.

Correct! Wrong!

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

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

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.

Correct! Wrong!

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

False.

True.

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.

True.

False.

Correct! Wrong!

The 9th stage modulating and shut-off valve:

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

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

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

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.

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

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

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

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

Correct! Wrong!

Engine bleed air is obtained from:

5th and 8th stage of the compressor section.

5th and 9th stage of the compressor section.

4th and 9th stage of the compressor section.

4th and 8th stage of the compressor section.

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:

18 deg.C (65 deg.F) (18u00b0C) to 30 deg.C (85 deg.F).

17 deg.C (63 deg.F) (18u00b0C) to 26 deg.C (79 deg.F).

16 deg.C (61 deg.F) (18u00b0C) to 25 deg.C (77 deg.F).

19 deg.C (66 deg.F) (18u00b0C) to 29 deg.C (84 deg.F).

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!

What are the causes of an amber AUTO FAIL light?

All statements are correct.

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.

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!

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

True.

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

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 isolation valve is:

AC controlled and pneumatically operated.

DC operated.

AC operated.

Correct! Wrong!

The recirculation fans:

Reduce air conditioning pack load.

Provide overheat detection downstream of the packs.

Are driven by a DC motor.

Increase airflow at greater cabin differential pressures.

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:

Throttles position and signals from the IRS.

Throttle position from both stall management computers.

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

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

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!

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

True.

False.

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 _____.

60 seconds.

5 seconds.

20 seconds.

3 minutes.

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!

An illuminated BLEED TRIP OFF light indicates:

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

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

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

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

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!

How are the Engine Bleed Air valves powered?

They are pneumatically activated and DC operated.

They are DC activated and pneumatically operated.

They are pneumatically activated and AC operated.

They are AC activated and pneumatically operated.

Correct! Wrong!

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

FL410.

FL100.

FL180.

FL250.

Correct! Wrong!

What causes the amber PACK TRIP OFF Light to illuminate?

Compressor outlet duct temperature has exceeded limits

Main distribution duct temperature has exceeded limits.

All statements are correct.

Turbine inlet duct temperature has exceeded limits.

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!

Boeing 737 MAX – Air Systems

Quiz

Boeing B737 MAX - Air Systems

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

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

When does the amber DUAL BLEED Light illuminate?

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?

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

The maximum differential pressure is:

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

The DUAL BLEED light is illuminated. Engine thrust:

The ram air system deflector doors:

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.

Water tank pressurisation in flight is normally provided by:

Duct pressure splits soon after landing.

The motorized Exhaust valve:

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

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:

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

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

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

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

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

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

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

A DUCT OVERHEAT light only will cause:

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.

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.

The ram air system provides cooling air for the:

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

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

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

The altitude warning horn is:

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

Overheat detection is provided by temperature sensors located:

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

Illumination of the BLEED light indicates:

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

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

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

What is the purpose of the recirculation fans?

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

In cruise the air conditioning ram air doors are:

Where are the wing-body overheat sensors located?

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

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

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

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

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

Where is the forward outflow valve located?

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

During descent when the descent mode is activated:

In MANUAL pressurization mode the outflow is driven by?

What systems need pneumatic power for operation?

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

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?

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

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

Where are the bleed trip sensors installed?

From where does the Cabin Auto Controller get its inputs.

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

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

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.

The 9th stage modulating and shut-off valve:

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.

Engine bleed air is obtained from:

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:

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.

What are the causes of an amber AUTO FAIL light?

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:

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

The isolation valve is:

The recirculation fans:

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

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

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 _____.

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

An illuminated BLEED TRIP OFF light indicates:

The pneumatic duct pressure gauge:

How are the Engine Bleed Air valves powered?

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

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.

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.