B737Ng Airsystems Qrh 2

Front 1

1.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?

Back 1

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

Front 2

2.When pressing Master Caution Recall the CONT CAB amber ZONE TEMP light illuminates. What is correct?

Back 2

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

Front 3

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

Back 3

When descending 0.25psi below the selected flight altitude

Front 4

4.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?

Back 4

The automatic abort capability for the departure airport is lost

Front 5

5.From where does the Cabin Auto Controller get its inputs.

Back 5

From the ADIRU’s

Front 6

6.Where are the bleed trip sensors installed?

Back 6

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

Front 7

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

Back 7

Right engine strut

Front 8

8.What is the purpose of the recirculation fans?

Back 8

To decrease the air conditioning system pack load

Front 9

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

Back 9

AIR COND

Front 10

10.One PACK light illuminates on recall only. What is the situation?

Back 10

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

Front 11

11.The Recirculation Fan:

Back 11

Reduces air conditioning pack load

Front 12

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

Back 12

Either pack switches are in HIGH and recirculation fan is OFF

Front 13

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

Back 13

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

Front 14

14.In MANUAL pressurization mode the outflow is driven by?

Back 14

A motor supplied from DC standby bus

Front 15

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

Back 15

The Left pack

Front 16

16.During descent when the descent mode is activated:

Back 16

Aircraft descends 0.25 psi below the selected FLT ALT

Front 17

17.The maximum differential pressure is:

Back 17

9.10 psi

Front 18

18.What are the causes of an Amber AUTO FAIL light?

Back 18

Loss of DC power;
Excessive rate of cabin press change or cabin altitude above 15800 ft;
Both above statements are correct;

Front 19

19.Given 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:

Back 19

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

Front 20

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

Back 20

Engine thrust is increased towards takeoff thrust.

Front 21

21.AUTO mode active. The AUTO FAIL light illuminates when:

Back 21

The cabin altitude exceeds 15,800ft.

Front 22

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

Back 22

Pressurization has automatically switched to the ALTN system.

Front 23

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

Back 23

The ADIRUs.

Front 24

24.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

Back 24

5 seconds

Front 25

25.Where is the forward outflow valve located?

Back 25

There is no forward outflow valve.

Front 26

26.The forward outflow valve:

Back 26

has been removed from the 737-600/700 models.

Front 27

27.Why should livestock (animals) be transported in the FWD cargo holds?

Back 27

Because they are heated by air from the E&E bay.

Front 28

28.If a flight is aborted, and a return to the field of departure is made, the crew:

Back 28

Should do nothing to the pressurization panel, as the system will automatically return to the field of departure.

Front 29

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

Back 29

FL250.

Front 30

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

Back 30

False

Front 31

31.The Altitude Warning Horn is:

Back 31

An intermittent warning horn accompanied by a Master Caution warning.

Front 32

32.On hearing the Altitude Warning Horn the pilot\'s first action should be to:

Back 32

To don oxygen masks.

Front 33

33.An amber AUTOFAIL indication will illuminate if one or more of the followingconditions occur:

Back 33

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

Front 34

34.A decompression of the cabin will result in the following:

Back 34

An 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.

Front 35

35.A flight deck ZONE TEMP light which remains illuminated after the master caution system is reset indicates:

Back 35

A flight deck duct overheat.
A failure of the standby or primary flight deck zone controller.
Both above statements are correct

Front 36

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

Back 36

True

Front 37

37.In Cruise the air conditioning ram air doors are:

Back 37

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

Front 38

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

Back 38

The fault was caused by an overheat trip.

Front 39

39.The ram air system provides cooling air for:

Back 39

The heat exchangers.

Front 40

40.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:

Back 40

Electrically by the air-ground safety sensor

Front 41

41.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:

Back 41

Close

Front 42

42.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.

Back 42

24°C (75°F) and 18°C (65°F)

Front 43

43.Overheat detection is provided by temperature sensors located:

Back 43

Downstream of the packs and the mix manifold.

Front 44

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

Back 44

All three modes use DC motor.

Front 45

46.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.

Back 45

8 000 ft and 41 000 ft.

Front 46

47.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 theCaptain\'s and First Officer\'s BARO reference selectors.The automatic controllers also receive:

Back 46

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

Front 47

48.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.

Back 47

True

Front 48

49.If both the primary and the standby pack controls fail for the same pack, thePACK, MASTER CAUTION, and AIR COND System Annunciator lights illuminate.

Back 48

The pack will continue to operate without control unless excessive

Front 49

51.A DUCT OVERHEAT light only will cause:

Back 49

The temperature mix valves to drive full cold.

Front 50

52.What systems need pneumatic power for operation?

Back 50

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

Front 51

Engine bleed air is obtained from:

Back 51

5th and 9th stage of the compressor section.

Front 52

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

Back 52

Engine Bleed Air valve.

Front 53

How are the Engine Bleed Air valves powered?

Back 53

They are DC activated and pneumatically operated.

Front 54

An illuminated BLEED TRIP OFF light indicates:

Back 54

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

Front 55

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

Back 55

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

Front 56

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

Back 56

The amber WING-BODY OVERHEAT Lights illuminate.

Front 57

59.When does the amber DUAL BLEED Light illuminate?

Back 57

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

Front 58

60.In the PACK TRIP OFF Non Normal Check-List, the crew selects a warmer temperature in order to:

Back 58

Reduce the workload on the affected air conditioning pack

Front 59

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

Back 59

Nothing. This is normal condition before engine start.

Front 60

The motorized Exhaust valve:

Back 60

Allows for increased ventilation in the smoke removal configuration.
Serves as backup to the outflow valve if the outflow valve fails.
Is normally open in pressurized flights above 8,000 feet

Front 61

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

Back 61

True

Front 62

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

Back 62

It is discharged overboard.

Front 63

What causes the amber PACK TRIP OFF Light to illuminate?

Back 63

Main distribution duct temperature has exceeded limits.
Compressor outlet duct temperature has exceeded limits
Turbine inlet duct temperature has exceeded limits

Front 64

The ram air system deflector doors:

Back 64

Extend on the ground only.

Front 65

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

Back 65

True

Front 66

68.The Equipment Cooling Supply or Exhaust OFF light illuminated indicates a loss of airflow from the selected cooling fan. You position the EQUIPMENT COOLING SUPPLY/EXHAUST switch on ALTERNATE

Back 66

No further action is necessary in flight if the equipment cooling OFF light does not extinguish.

Front 67

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

Back 67

Left WING‐BODY OVERHEAT light illuminates