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REX - 737 Systems > Chapter 2 - Air Systems > Flashcards

Chapter 2 - Air Systems Flashcards

1
Q

The overboard exhaust valve (OEV) allows for:

(1x)

A

increased ventilation in the smoke removal configuration.

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2
Q

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

A

Open if either engine BLEED air or air conditioning PACK switch positioned OFF.

(Think isolated.. either bleed or pack)

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3
Q

When making a no engine bleed takeoff and an engine failure occurs, when will the bleed air switch be positioned to ON?

A

When reaching 1500 feet or until obstacle clearance high has been attained.

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4
Q

The maximum cabin differential pressure (relief valves) is:

A

9.1 psi.

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5
Q

The Cabin Pressurization panel MANUAL light is illuminated green indicates:

A

the pressurization system is now in the manual mode.

Manual control of the cabin altitude is used if both the AUTO and ALTN modes are inoperative

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6
Q

The bleed air duct pressure indicator:

A

Is AC operated.

(Bleed air duct BAD Ass C)

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7
Q

The blue RAM DOOR FULL OPEN light illuminates:

A

when the ram door is in the full open position.

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8
Q

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

A

The airplane has descended before reaching the planned cruise altitude set in the FLT ALT indicator.

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9
Q

The main source of conditioned air for the flight deck is:

A

excess air from the left pack that is upstream of the mix manifold.

(The captain is the most important, the captain sits on the left side…)

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10
Q

The amber DUAL BLEED light indicates:

A

a possible APU back pressure condition and thrust must be limited to idle.

(dual bleed, dual source - engines + APU)

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11
Q

What systems rely on the bleed air system for operation?

A
  1. air conditioning / pressurization,
  2. engine starting,
  3. wing and engine anti-ice,
  4. hydraulic reservoirs and
  5. water tank pressurization.
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12
Q

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

A

Both of the amber WING BODY OVHT lights illuminate.

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13
Q

With the engine bleed air switch ON, how are the engine bleed air valves powered?

A

They are DC activated and pressure operated.

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14
Q

What causes the PACK light to illuminate?

A
  1. failure of both primary and standby pack controls.
  2. pack trip off
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15
Q

What causes the amber PACK TRIP OFF light to illuminate?

A

The temperature in the pack has exceeded limits.

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16
Q

What fault indications can be reset with the TRIP RESET switch?

A
  1. BLEED TRIP OFF
  2. PACK TRIP OFF
  3. DUCT OVERHEAT.
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17
Q

In the PACK TRIP OFF non-normal procedure, the crew selects a warmer temperature in order to:

A

Reduce the workload on the affected air conditioning pack.

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18
Q

The recirculation fan:

A

reduces air conditioning pack load and engine bleed air demand.

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19
Q

A DUCT OVERHEAT will cause:

A

The air mix valves to drive to full cold.

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20
Q

Illumination of the amber AUTO FAIL light indicates:

A
  1. Loss of DC power
  2. Controller fault
  3. Outflow valve control fault
  4. Excessive Differential Pressure
  5. Excessive rate of cabin pressure change
  6. High cabin altitude
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21
Q

The BLEED TRIP OFF light indicates:

A

excessive engine bleed air temperature or pressure. The respective engine bleed air valve closes automatically.

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22
Q

What fault indications can be reset with the TRIP RESET switch?

A

a. BLEED TRIP OFF.
b. PACK.
c. ZONE TEMP.
d. All of the answers are correct.

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23
Q

In the PACK non-normal procedure, the crew selects a warmer temperature in order to:

A

reduce the workload on the affected air conditioning pack

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24
Q

A ZONE TEMP amber light indicates on the Master Caution Recall:

A

failure of the flight deck primary or standby temperature control.

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25
Q

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

A

Related engine bleed air valve

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26
Q

The pack ram air system provides:

A

Cooling airflow for the pack heat exchangers when the aircraft is inflight or on the ground.

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27
Q

The ram inlet doors are fully open when:

A
  1. On the ground
  2. Inflight with flaps extended
  3. Inflight when maximum cooling is necessary
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28
Q

Which indications are given for the ram doors when they are fully open?

A

RAM DOOR FULL OPEN annunciator on the overhead panel

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29
Q

The RAM DOOR FULL OPEN light extinguishes when:

A

The ram door begins to close

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30
Q

The deflector doors are controlled by:

A

The air/ground safety sensor

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31
Q

The position of the ram inlet door is determined by:

A

The compressor discharge temperature

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32
Q

What position would you expect the ram inlet doors to be during cruise?

A

Full close (a small opening remains to allow for some air to pass over the heat exchangers)

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33
Q

What provides cooling air for the heat exchangers when the aircraft is on the ground or in slow flight?

A

A fan mounted on the shaft of the air cycle machine which extends into the ram air duct.

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34
Q

The three temperatures for C, W and AUTO are:

A

18, 30 and 21 degrees Celsius

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35
Q

The trim air system is used to:

A

Control the temperature of air delivered from 2 packs to 3 zones. This is controlled by a master TRIM AIR switch.

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36
Q

The trim air modulating valves:

A

Provide the temperature control to each zone

37
Q

With trim air ON:

A
  • Trim air pressure regulator and shutoff valve is OPEN
  • This allows hot bleed air to flow to the three modulating valves
    • The trim air modulating valves provide the temperature control to the three zones
38
Q

With trim air OFF:

A
  • The L PACK provides air at the temperature selected by the flight deck
    • The R PACK provides air at a temperature which is an average between the FWD and AFT cabin temp selectors.
39
Q

The RIGHT trim air controller provides modulation for the:

A

FWD CAB & CONT CAB

40
Q

The LEFT trim air controller provides modulation for the:

A

AFT CAB & backup for CONT CAB

41
Q

What is the logic for zone temperature control during single pack operation with the Trim Air switch ON?

A

Same as two pack operations

42
Q

What is the logic for zone temperature control during single pack operation with the Trim Air switch OFF?

A

The operating pack attempts to provide air temperature that satisfies the average temperature demands of all three zones

43
Q

If the Temp Selector is selected OFF:

A

The ZONE TEMP light illuminates. Temperature is determined from the pack only.

44
Q

When adjusting temperature, monitor:

A

The associated CONT, FWD or AFT duct temp gauge and make 5 degree increments.

45
Q

The ZONE TEMP light will illuminate for either:

A

A temp selector moved to the OFF position or a duct temperature overheat

46
Q

If there is a temperature controller selector failure, which indications will you receive?

A

None. Upon recall only - ZONE TEMP.

47
Q

When there is a failure of the FWD or AFT temperature controller:

A

The forward and after temperature selections are averaged.

48
Q

With a trim air failure:

A

The left pack drives the CONT CAB temp and the right pack drives the FWD and AFT CAB temps, whichever is colder.

49
Q

When the passenger trim air fails:

A

The forward and aft zone temp demands averaged for control of the right pack

50
Q

If all zone controls and primary pack controls fail:

A

The standby pack controls command the packs to produce temperatures which will satisfy the average temperature demand of the two cabin zones.

51
Q

The PACK light illuminates for:

A
  1. A pack trip or
  2. For failure of both primary and standby pack controls
  3. Excessive pack temp
52
Q

The TRIP RESET switch can reset:

A
  1. BLEED TRIP OFF
  2. PACK lights
  3. ZONE TEMP lights
53
Q

The recirc fans reduce:

A

Pack load and engine bleed air demand

54
Q

Which recirc fan cools the E&E bay?

A

Right

55
Q

The left recirc fan draws air from the:

A

Air distribution compartment

56
Q

The right recirc fan draws air from the:

A

Main cabin and E&E bay

57
Q

When on the ground and both packs selected to HIGH:

A

The left recirc fan will shutdown

57
Q

When on the ground and both packs selected to HIGH:

A

The left recirc fan will shutdown

58
Q

When on the ground and both packs selected to HIGH:

A

Both recirc fans will shutdown and the OEV will open

59
Q

When the right recirc fan is OFF and either pack switch is HIGH, electrical equipment cooling is maintained by:

A

Opening of the OEV

60
Q

The electrical cooling supply fan is a:

A

push fan

61
Q

The electrical cooling exhaust fan is a:

A

pull fan

62
Q

If airflow is not adequate for either the supply or exhaust fans for equipment cooling:

A

The associated OFF, MASTER CAUTION and OVERHEAD annunciator lights illuminates

63
Q

For normal operations in flight when the right recirc fan is ON and cabin differential pressure is high exhaust air is:

A

Routed around (not into) the forward cargo compartment. This keep the liner warm.

64
Q

When the right recirc fan is OFF and cabin differential pressure is high exhaust air is:

A

Exhaust air is ducted overboard through the OEV.

65
Q

For normal operations on the ground when cabin differential pressure is low exhaust air is:

A

Exhaust air is ducted overboard through the OEV.

66
Q

A single pack in HIGH flow can maintain:

A

Normal temperatures up to the maximum operating altitude

67
Q

Ground air can operate the left pack if:

A

The isolation valve is open.

68
Q

With both packs operating from engine bleed air, the packs operate at:

A

Low flow

69
Q

High flow is provided by the APU when either:

A

Engine bleed air switches are OFF (automatic) and on the ground when engine bleed is off and pack switches are in the HIGH position

70
Q

The isolation valve opens automatically when:

A

Either bleed switch or pack switch is in OFF

71
Q

Bleed air is cooled:

A

As it passes through the primary heat exchanger. (airflow is provided by the ram air system)

72
Q

If 5th stage bleed air is insufficient:

A

the 9th stage modulating valve will open

73
Q

The bleed air valve is ____ powered and ____ operated.

A

DC, pneumatically

74
Q

The precooler uses:

A

Engine fan air which is then dumped overboard.

75
Q

The 9th stage air has a higher ___ and ___.

A

temperature, pressure

76
Q

A BLEED TRIP OFF occurs for either:

A

5th stage temperature overheat or 9th stage excessive pressure.

77
Q

The APU bleed air must be closed during ground use of EAI because:

A

back pressure of the 9th stage valve is possible, potentially reducing cowl anti-ice.

78
Q

The DUAL BLEED light can illuminate when the #1 engine is not running and supplying bleed air because:

A

The light only monitors the position of the switch not the bleed valve.

79
Q

The DUAL BLEED light can illuminate when the #2 engine is not running and supplying bleed air because:

A

The light only monitors the position of the switch not the isolation valve.

80
Q

The DUAL BLEED light monitors the position of:

A

The APU valve, the isolation valve and the engine bleed switches.

81
Q

The APU needs to be running at over ___ in order to supply bleed air.

A

95% RPM

82
Q

The APU bleed air may be turned on after a ____ delay.

A

1 minute

83
Q

The four unpressurized areas as:

A
  1. radome
  2. nose gear well
  3. main gear well
  4. aft compartment
84
Q

The purpose of the packs are to offer:

A

air conditioning, ventilation and pressurisation

85
Q

In the even one pack is inoperative, cabin altitude can be maintained at or below _____ when the aircraft is at _____.

A

8,000’, maximum certified altitude

86
Q

Pressurization and ventilation are controlled by:

A

modulating the outflow valve and the overboard exhaust valve.

87
Q

VH-VBY, VH-VBZ

The overboard exhaust valve is driven open if:

A

either pack switch is in high and the recirculation fan is off. This allows for increased ventilation in the smoke removal configuration.

88
Q

2-VYFG - VH-RQP, VH-VOK - VH-YWE

The overboard exhaust valve is driven open if:

A

either pack switch is in high and the right recirculation fan is off. This allows for increased ventilation in the smoke removal configuration.

REX - 737 Systems (17 decks)

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