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Air Systems
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Questions in this quiz (50)
1The overboard exhaust valve (OEV):
- AAllows for increased ventilation in the smoke removal configuration
- Blnflight the overboard exhaust valve is normally open and exhaust air is diffused to
the lining of the forward cargo compartment - CThe overboard exhaust valve remains closed if both pack switches are in high
- DAll answers are correct.
2What is the position of the isolation valve when the ISOLATION VALVE switch is in AUTO?
- AThat depends on the position of the APU bleed switch.
- BThe isolation valve is always closed.
- CThe isolation valve automatically modulates between open and closed, depending
on pneumatic load - DOpen if either engine BLEED air or air conditioning PACK switch positioned OFF
3When making a no engine bleed takeoff and an engine failure occurs, when will the
bleed air switch be positioned to ON?- APrior to 400 feet above the ground.
- BAfter passing through 2000 feet above the ground.
- CWhen reaching 1500 feet or until obstacle clearance high has been attained
- DAt not less than 400 feet, and prior to 2000 feet above field elevation.
4The maximum cabin differential pressure (relief valves) is:
- A7 .8 psi.
- B7.1 psi.
- C8.3 psi.
- D9.1 psi.
5The Cabin Pressurization panel MANUAL light is illuminated green, what does this
indicate?- AThe manual outflow valve is full open.
- BThe aircraft is in an off - scheduled descent.
- CThe pressurization system is now in the manual mode
- DThe manual outflow valve is full closed .
6The bleed air duct pressure indicator:
- ACannot indicate external air pressure.
- BIndicates both temperature and pressure in the bleed air duct.
- CIs AC operated.
- DIs DC operated.
7The blue RAM DOOR FULL OPEN light illuminates:
- AWhen the airplane is in flight with the landing gear extended.
- BWhen the airplane is in flight with the packs in HIGH.
- CWhen the airplane is not in flight with the packs in AUTO.
- DWhen the ram door is in the full open position
8The amber OFF SCHEDULE DESCENT light illuminates. What does this indicate?
- AThe pressurization controller is unable to maintain cabin pressure.
- BThe airplane has descended before reaching the planned cruise altitude set in the FLT ALT indicator.
- CThe pressurization controller has failed and will automatically shift to the AL TN mode.
- DAll the answers are correct.
9What is the main source of conditioned air for the flight deck?
- AThe right air conditioning pack.
- BThe left air conditioning pack.
- CBoth air conditioning packs.
- DExcess air from the left pack that is upstream of the mix manifold.
10The amber DUAL BLEED light indicates:
- AA possible APU back pressure condition and thrust must be limited to IDLE.
- Bthe isolation valve is open.
- Coverpressure of the left and right bleed air systems.
- Dthe APU bleed air switch is ON and both bleed air switches are ON.
11What systems rely on the bleed air system for operation?
- AAir conditioning/Pressurization, Wing Anti-ice, Fuel tanks.
- BWing Anti-ice, APU, engine starting.
- CAPU, engine starting, Air conditioning/Pressurization.
- DEngine starting, Air conditioning/ Pressurization, Wing and Engine Anti-ice,
hydraulic reservoirs and water tank pressurization.
12What happens when the WING-BODY OVHT TEST switch is pressed?
- ABoth of the amber WING-BODY OVHT lights illuminate.
- BBoth of the amber PACK TRIP OFF lights illuminate.
- CBoth of the amber BLEED TRIP OFF lights illuminate.
- DAll answers are correct.
13With the engine bleed air switch ON, how are the engine bleed air valves powered?
- AThey are AC activated and pressure operated.
- BThey are DC activated and pressure operated.
- CThey are pressure activated and AC operated.
- DThey are pressure activated and DC operated.
14What causes the PACK light to illuminate?
- AFailure of either primary or standby pack control.
- BTemperature upstream of the pack has has exceeded limits.
- CFailure of both primary and secondary pack controls
- DExcessive air pressure in the pack
15What causes the amber PACK TRIP OFF light to illuminate?(-300/500/600/700)
- AThe temperature in the pack has exceeded limits
- BSelecting MANUAL with the related pack control.
- CThe temperature upstream of the related pack has exceeded limits.
- DNone of the answers are correct.
16What fault indications can be reset with the TRIP RESET switch?
- ABLEED TRIP OFF.
- BPACK TRIP OFF.
- CDUCT OVERHEAT .
- DAll of the answers are correct
17In the PACK TRIP OFF non-normal procedure, the crew selects a warmer temperature
in order to:- AReduce cabin air outflow.
- BReduce the workload on the other pack.
- CReduce the workload on the affected air conditioning pack.
- DReduce the air flow through the air mix valves.
18The recirculation fan:
- AIs driven by a DC motor.
- BIncreases airflow at greater cabin differential pressures.
- CReduces air conditioning pack load and engine bleed air demand
- DProvides overheat detection downstream of the packs.
19A DUCT OVERHEAT will cause:
- AThe air mix valves to drive to full cold.
- BThe air mix valves to drive to full hot.
- CAn automatic shutdown of the pack.
- DA BLEED TRIP OFF condition
20Illumination of the amber AUTO FAIL light indicates any of the following has occured.
- Aloss of both AC and DC power.
- Bthe backup control has failed.
- Cpressurization mode selector is in the manual mode.
- Dloss of DC power
21A ZONE TEMP amber light indicates on the Master Caution Recall
- Aautomatic shutdown of the pack
- Bfailure of both the flight primary and secondary standby temperature control.
- Ctrim air modulating valve has failed.
- Dfailure of the flight deck primary or standby temperature control.
22Illumination of the amber BLEED TRIP OFF Light indicates what valve has
automatically closed?- AModulating and shutoff valve.
- BRelated engine bleed air valve
- CIsolation valve
- DAll of the above are correct.
23During 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?- ASince the trim air is off both packs will average the temperature that satisfies the zone which
requires the most cooling. - BDuring single pack operation the zone temperature is controlled the same as during two pack
operation. - CWith the TRIM AIR selected OFF, the pack attempts to produce an air temperature to satisfy
the average temperature demands of all three zones. - DIf 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.
- ASince the trim air is off both packs will average the temperature that satisfies the zone which
24When pressing Master Caution Recall the CONT CAB amber ZONE TEMP light illuminates.
What is correct?- AThis indicates a failure of both the primary and standby temperature control systems.
- BDue to failure of the primary flight deck temperature control, automatic switching to the
backup system has occurred - CThis indicates one PACK has overheated and has to be reset by pushing the trip reset
button. - DThis indicates that both temperature controllers will regulate the temperature to a preset
value.
25When will the descent mode be activated in the pressurization system?
- AWhen T/D is reached.
- BWhen retard is announced in the FMA.
- CWhen descending 0.25psi below the selected flight altitude.
- DWhen within 15 000 feet of the landing airport.
26Due 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?- AThe system will be recalculating the pressurization for the departure airport.
- BThe pressurization will increase its ventilation and possibly pressurization will be lost.
- CThe automatic abort capability for the departure airport is lost.
- DNothing will happen and you will still get the OFF SCHED DESCENT warning.
27From where does the Cabin Auto Controller get its inputs.
- AFrom the static ports.
- BFrom the Captain’s CDU.
- CFrom the ADIRU’s.
- DFrom the EFIS control panel.
28Where are the bleed trip sensors installed?
- AOn the 9th Stage bleed air line.
- BOn the engine side of the engine bleed air valve.
- CSensors are positioned on both sides of the engine bleed air valve.
- DOn the bleed air duct prior to the pack valve.
29One PACK light illuminates on recall only. What is the situation?
- AThere is FOD in the RAM AIR intake forcing the pack to shut down.
- BBoth primary and secondary pack controls have failed.
- CThe primary pack control has failed and the pack is now controlled by the standby pack
control - DBoth temperature control valves have shut closed in the affected pack.
30Cruising at FL 370. The motorized Overboard Exhaust valve will open if:
- AEither pack switches are in HIGH and recirculation fan is OFF.
- BBoth pack switches are in AUTO and recirculation fan is OFF.
- CBoth pack switches are in HIGH and recirculation fan is ON.
- DBoth pack switches are in AUTO and recirculation fan is ON.
31In MANUAL pressurization mode the outflow is driven by?
- AA motor supplied from DC bus 2.
- BA motor supplied from DC standby bus.
- CA motor supplied from DC bus 1.
- DRequires AC power from transfer bus 1.
3218. What are the causes of an Amber AUTO FAIL light?
- ALoss of DC power;
- BExcessive rate of cabin press change or cabin altitude above 15800 ft;
- CBoth above statements are correct;
33Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT
selector during preflight, but subsequently the A/C climbed to FL390, would you expect:- AA differential pressure of 7.45 psi maintained by the negative pressure relief valve;
- BA differential pressure of 9.1 psi maintained by the positive pressure relief valve;
- CA differential pressure of 8.35 psi maintained by the forward outflow valve;
34The cabin will automatically pressurize to 0.125 PSID on the ground when:
- AEngine thrust is increased towards takeoff thrust.
- BWhen the PSEU is activated
- CWhen the aircraft goes into the ground mode of the air/ground sensor.
35Loss 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- A5 seconds
- B30 seconds
- C1 minute
- D3 minutes
36Why should livestock (animals) be transported in the FWD cargo holds?
- ABecause they are cooled by air from the E&E bay.
- BBecause they are heated by air from the E&E bay.
- CThe FWD cargo hold is the preferred hold, because the door is larger than the aft cargo door
making loading easier
37What is the flight level limitation for DISPATCH with one pack INOP?
- AFL100.
- BFL180.
- CFL250
- DFL410
38On hearing the Altitude Warning Horn the pilot\'s first action should be to:
- AAnalyse the situation and decide on corrective action.
- BTo don oxygen masks.
- CInitiate an emergency descent.
- DCancel the Altitude Warning Horn and call for the appropriate QRH checklist.
39A decompression of the cabin will result in the following:
- AAn Altitude Warning Horn at 10,000 ft. At 14,000 ft (approximately) a \'Master Caution\', plus
an \'Overhead\' indication on the light/glare shield will illuminate. The overhead panel will
illuminate with \'PAX OXY ON\' amber indications. - BAn Altitude Warning Horn at 14,000 ft. The overhead panel will illuminate \'AUTOFAIL\' and
\'ALTN\' amber indications on the pressurisation panel. These indications may be reset by
selecting manual mode on the pressurisation selector. - CAn Altitude Warning Horn at 10,000 ft. At 14,000 ft the Passenger Oxygen mask will deploy.
To activate Oxygen flow to the Passengers the Crew must select the \'Passenger Oxygen
Switch\' to ON. - DAn altitude warning buzzer at 10,000 ft. At 14,000 ft the oxygen masks will deploy and the
overhead panel will show \'CREW OXY ON\'.
- AAn Altitude Warning Horn at 10,000 ft. At 14,000 ft (approximately) a \'Master Caution\', plus
40A flight deck ZONE TEMP light which remains illuminated after the master caution system
is reset indicates:- AA flight deck duct overheat.
- BA failure of the standby or primary flight deck zone controller.
- CBoth above statements are correct.
41In Cruise the air conditioning ram air doors are:
- AFully open.
- BFully closed.
- CModulate between open and closed as required for pack temperature control.
- DModulate as a function of airspeed.
42If a PACK light can be reset by the TRIP RESET switch then:
- AThe fault was caused by an overheat trip.
- BThe fault was caused by a controller fault.
- CThe fault was caused by an overheat trip or by a controller fault.
- DThe pack should be selected off as per the QRH.
43If 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.- A20°C (68°F) and 18°C (65°F)
- B24°C (75°F) and 18°C (65°F)
- C18°C (65°F) and 22°C (72°F)
44Overheat detection is provided by temperature sensors located:
- AIn the mix manifold.
- BDownstream of the packs.
- CDownstream of the packs and the mix manifold.
- DDownstream of the packs, the trim air valve and the mix manifold.
45The 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 theCaptain\'s and First
Officer\'s BARO reference selectors.The automatic controllers also receive:- AThrottle position from both stall management computers.
- BThrottle position from both stall management computers and signals from the air/ground
sensors. - CThrottle position from both stall management computers and signals from the IRS.
46Engine bleed air is obtained from:
- A4th and 9th stage of the compressor section.
- B5th and 9th stage of the compressor section
- C4th and 8th stage of the compressor section.
- D5th and 8th stage of the compressor section.
47An illuminated BLEED TRIP OFF light indicates:
- AToo high temperature or pressure in bleed air duct and bleed air valve stays closes.
- BToo high pressure in bleed air duct and bleed air valve stays open.
- CToo high temperature in bleed air duct and bleed air valve stays closes.
- DToo high temperature in bleed air duct and bleed air valve stays open
48The motorized Exhaust valve:
- AAllows for increased ventilation in the smoke removal configuration
- BIs normally open in pressurized flights above 8,000 feet.
- CServes as backup to the outflow valve if the outflow valve fails.
- DAll the above.
49A leak in the APU Bleed Air Duct will be indicated by:
- ARight WING!BODY OVERHEAT light illuminates
- BAPU BLEED light illuminates on overhead panel
- CLeft WING!BODY OVERHEAT light illuminates
- DCWS Master Caution BLEED
50On the Bleed Air Duct pressure indicator the L pressure indicates 40psi, the R pressure
indicates 50psi:- AAs long as there is sufficient air for cabin pressurization, this is normal.
- BSelect L pack to HIGH until pressure indications equalize.
- CSet both packs to high for 2 minutes.
- DSet R RECIRC FAN to OFF
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- Técnico Boeing 737-800 Quiz on Air Systems, created by Voar Voar Subir Subir on 22/07/2025.
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- Voar Voar Subir Subir
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- Português
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