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B737 > AIR CONDITIONING AND PRESSURIZATION > Flashcards

AIR CONDITIONING AND PRESSURIZATION Flashcards

1
Q

When does the DUAL BLEED light illuminate?

A

Illuminated (amber) – APU bleed air valve open and engine No. 1 BLEED air
switch ON, or engine No. 2 BLEED air switch ON, APU bleed air valve and
isolation valve open

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2
Q

When in AUTO mode, when does the isolation valve automatically close?

A

Isolation valve closes automatically if both engine BLEED air switches are ON and both air conditioning PACK switches are AUTO or HIGH

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3
Q

When in AUTO mode, when does the isolation valve automatically open?

A

Isolation valve automatically opens if either engine BLEED air or air
conditioning PACK switch positioned OFF

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4
Q

What does the left wing body over heat light mean?

A

left light indicates overheat from bleed air duct leak in left engine strut, left
inboard wing leading edge, left air conditioning bay, keel beam or APU
bleed air duct

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5
Q

What does the right wing body overheat light mean?

A

right light indicates overheat from bleed air duct leak in right engine strut,
right inboard wing leading edge or right air conditioning bay

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6
Q

What does the bleed trip off light indicate?

A

Illuminated (amber) – excessive engine bleed air temperature, over-pressure or
under-pressure
— related engine bleed air valve closes automatically
— requires reset
OR
Illuminated (amber) – a failure within the bleed air system
— bleed system failure may not be resettable
OR
Illuminated (amber) – an incorrect bleed air configuration after takeoff or
go-around
— turning either BLEED switch ON will extinguish both BLEED lights if
lights illuminated because of a configuration problem

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7
Q

What does the bleed trip reset button do?

A

resets BLEED TRIP OFF, PACK or ZONE TEMP lights
— related engine bleed air valve opens, or related pack valve opens, or related
trim air modulating valve opens
Lights remain illuminated until reset

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8
Q

ZONE TEMP Lights Illuminated amber. What does it mean?

A

ZONE TEMP Lights Illuminated (amber):
— CONT CAB indicates a duct temperature overheat or failure of the
flightdeck primary and standby temperature control
— FWD CAB or AFT CAB indicates duct temperature overheat.

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9
Q

During a RECALL, what does the associated ZONE TEMP Lights illuminated amber mean?

A

CONT CAB indicates failure of the flightdeck primary or standby temperature control

FWD CAB or AFT CAB indicates failure of the associated zone temperature control

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10
Q

What happens to the associated trim air modulating valve when you turn a temperature selector knob to the off position?

A

Turns the associated trim air modulating valve off

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11
Q

With the pack switch in AUTO, what happens if you turn one pack switch off?

A

The other pack goes to high flow if the flaps are up

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12
Q

With the pack switch in AUTO, what happens if you are operating one pack with the apu and both engine bleed switches off?

A

The operating pack goes to high flow

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13
Q

In flight, does the right recirculating fan operate if both pack switches are in high?

A

No

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14
Q

In flight, does the left recirculating fan work if either pack switch is in high?

A

No

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15
Q

On the ground, the right recirculation fan operates even if both PACK switches are in
HIGH. True or False?

A

True

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16
Q

On the ground, the left recirculation fan operates unless both PACK switches are in HIGH. True or False?

A

True

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17
Q

What does a pack light indicate?

A

Both primary and standby pack controllers failed
Or
Pack trip off
Or
Incorrect pack configuration after takeoff
Or
Indicates failure of the Flow Control Valve to open when commanded on

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18
Q

During Master Caution recall, what does a pack light indicate?

A

During Master Caution recall, indicates failure of either primary or standby
pack control

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19
Q

What happens to the EQUIP SMOKE light after smoke is no longer detected?

A

Light extinguishes 30 seconds after smoke is no longer detected

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20
Q

When does the altitude warning horn sound?

A

Altitude warning horn sounds when cabin exceeds 10,000 feet altitude

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21
Q

What does it mean when the ALTERNATE light is illuminated along with the AUTO FAIL pressurization light?

A

Single pressurization controller failure

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22
Q

What does it mean when the AUTO FAIL pressurization light is illuminated alone?

A

Both pressurization controllers failed

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23
Q

What is the minimum and maximum selectable values in the Flight altitude selector on the pressurization panel?

A

-1000 to 42000 ft

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24
Q

What is the minimum and maximum landing field elevation you can select on the pressurization panel?

A

-1000 to 14000 ft

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25
Q

How many pack controllers does each pack have?

A

2 independent controllers

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26
Q

Which systems rely on bleed air for operation?

A 
The following systems rely on the bleed air system for operation:
— Air conditioning/pressurization
— Wing and engine thermal anti-icing
— Engine starting
— Hydraulic reservoirs pressurization
— Water tank pressurization
— Aspirated TAT probe
— Nitrogen generation system
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27
Q

Do we have a nitrogen generation system?

A

Yes

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28
Q

Which stages do we tap bleed air from?

A

5th and 9th - NG
Or
4th and 10th - MAX

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29
Q

How are the engine bleed valves operated?

A

Electro pneumatic

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30
Q

Are the engine bleed valves AC or DC powered?

A

DC

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31
Q

What normally causes a an engine bleed valve to trip off?

A

Over temperature or over pressure

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32
Q

On certain aircraft, what happens if you takeoff with incorrect bleed configuration?

A

45 seconds after flaps are retracted, both BLEED lights illuminate

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33
Q

On certain aircraft, what happens, if there is a fault in the bleed system?

A

Bleed valve trips off and the BLEED light illuminates

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34
Q

Is the bleed isolation valve AC or DC powered?

A

AC

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35
Q

Is the isolation valve position affected by the apu bleed valve position?

A

No

36
Q

What happens to the apu bleed valve when the apu is shutdown?

A

Closes automatically even if the switch is open

37
Q

Is the apu bleed valve AC or DC powered?

A

DC

38
Q

Thrust must be limited to what with the DUAL BLEED light illuminated?

A

Idle to decrease the possibility of back pressuring

39
Q

Which pack supplies the flight deck?

A

Left pack. However, excess air from left pack is rerouted to the mix manifold for use in the cabin.

40
Q

Which pack supplies the cabin?

A

Right pack

41
Q

How many recirculation fans do we have?

A

2

42
Q

Should you operate both packs from a single engine bleed source?

A

No

43
Q

Can the apu supply both packs in the air and on the ground?

A

No. Only on the ground

44
Q

Where does preconditioned air enter the aircraft?

A

The mix manifold. It bypasses the packs. Packs should not be on while using pre conditioned air.

45
Q

What is the function of the ram air system?

A

The ram air system provides cooling air for the heat exchangers. Operation of the
system is automatically controlled by the packs through operation of ram air inlet
doors

46
Q

When is the ram air inlet door full open?

A

On the ground and in the air with flaps extended

47
Q

What happens to the ram air inlet doors while aircraft is in the air with flaps retracted?

A

They modulate

48
Q

When are the deflector doors closed?

A

They are closed while on the ground. They are open while in the air.

49
Q

What happens to the pack valve when there is an over heat condition?

A

Closes

50
Q

If a primary pack controller fails, what takes over?

A

The secondary controller in the opposite pack

51
Q

What is the temperature selector range?

A

18c - 30c

52
Q

What temperature does the pack controller maintain during single pack operations with the trim air off?

A

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

53
Q

What happens if air in a particular zone supply overheats?

A

The associated zone trim air modulating valve closes. You can reset it after the air cools down.

54
Q

What does a ZONE TEMP light mean?

A

If air in a zone supply duct overheats, the associated amber ZONE TEMP light
illuminate

55
Q

What happens if both the primary and backup controllers for both pack fails?

A

In the event of a dual failure of the IASCs resulting in both the primary and backup
controls becoming unavailable:
— Adjusting the Zone Temperature selectors will not change the temperature.
— The Pack Temperature Control valves and the three Zone Trim Air valves will
remain in the last commanded positions.
— The pack overheat protections will be functional and will automatically shut down
the Air Conditioning Pack if there is a pack overheat trip.
— If the control cabin (flightdeck) or passenger cabin becomes excessively hot or
cold, the flight crew should perform the Cabin Temp Hot or Cabin Temp Cold
non-normal checklist.

56
Q

What happens if all temp selectors are positioned off?

A

If all Temperature Selectors are positioned OFF, the pack controls will
cause the left pack to maintain a fixed temperature of 75°F (24°C) and the right pack
to maintain 65°F (18°C) as measured at the pack temperature sensor.

57
Q

Are the recirculation fans AC or DC?

A

AC

58
Q

If an overtemperature occurs on the ground, alerting is provided through the crew
call horn in the nose wheel well. True or False?

A

True

59
Q

How many fans does the equipment cooling supply duct have?

A

2

60
Q

How many fans does the equipment cooling exhaust duct have?

A

2

61
Q

What happens when smoke is detected in the E/E system?

A

When smoke is detected the system will automatically set the packs to high flow, turn the E/E Cooling Supply Fan(s) OFF for approximately 5 minutes, overboard exhaust valve opens to the smoke position and the recirculation fans turn off. The E/E Cooling Supply Fans return to normal operations 5 minutes after the first detection of smoke. If smoke is re-detected, the Supply Fans turn OFF for another 5 minutes.

62
Q

Where does the forward cargo compartment get air from?

A

Recirculation system circulates the air from the cabin into the forward cargo compartment.

63
Q

Where does the forward cargo compartment get additional heating from?

A

The E/E exhaust is routed into the forward cargo compartment anytime the overboard exhaust valve is closed.

64
Q

What are the 3 modes of pressurization?

A

Auto, Alternate and manual

65
Q

How many outflow valves do we have?

A

1

66
Q

Which valve acts like an outflow valve to aid in controlling cabin pressure?

A

Overboard exhaust valve

67
Q

The overboard exhaust valve is open while the aircraft is on the ground. True or False?

A

True

68
Q

The outflow valve is normally open while aircraft is on the ground. True or False?

A

True

69
Q

When does the pressurization controller start pressurizing the aircraft?

A

While on the takeoff roll. Pressurizes the aircraft to approximately 150 ft below takeoff field elevation.

70
Q

How many pressurization controllers are there?

A

2

71
Q

Are the motors that drive the outflow valve AC or DC powered?

A

DC

72
Q

How many motors are associated with the pressurization system that can be used to control the outflow valve?

A
  1. One for Auto mode, one for Alternate mode and one for Manual mode
73
Q

How many positive pressure relief valves are there?

A

2

74
Q

How many negative pressure relief valves are there?

A

1

75
Q

Maximum cabin altitude?

A

8000 ft at FL 410

76
Q

Where does the aft cargo compartment get air from?

A

Passenger cabin air is drawn through foot level grills, down around the aft cargo compartment, where it provides heating, and is discharged overboard through the outflow valve

77
Q

What happens if one of the auto pressurization controllers fail?

A

The alternate takes over

78
Q

The two auto pressurization controllers alternate on every leg as the primary controller. True or False?

A

True

79
Q

When is the cruise pressurization mode activated?

A

The cruise mode is activated when the airplane climbs to within 0.25 psi of the selected FLT ALT

80
Q

When is the descend mode activated by the pressurization controller?

A

The descent mode is activated when the airplane descends 0.25 psi below the selected FLT ALT. The cabin begins a proportional descent to slightly below the selected LAND ALT

81
Q

What happens if you divert back to the origin airport prior to reaching the selected cruise altitude with regard to the pressurization system?

A

The controller programs the cabin to land at the takeoff field elevation without further pilot inputs.

82
Q

Does the manual control motor operate at a slower or faster rate than the 2 auto motors?

A

Faster. Full travel of the outflow valve only takes 20 seconds

83
Q

The MAX can run both packs in the air with only one engine operating. True or False?

A

True

84
Q

The NG can run only one pack in the air with only one engine operating. True or False?

A

True

85
Q

Are all 3 motors that control the outflow valve AC or DC?

A

All are DC

B737 (22 decks)

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