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Suppe > 2 Air Systems > Flashcards

2 Air Systems Flashcards

1
Q

The air condition Pack control, zone temperature control, fault detection, and overheat protection
are all:

A

Automatic

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2
Q

The airplanes air condition is divided into three temperature zones:

A

Flight deck and two cabin
zones.

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3
Q

How many air conditioning packs are there?

A

Two

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4
Q

In which case are the packs output limited?

A

During high bleed air demand periods (such as during takeoff/landing or with an
engine inoperative). Pack output is further reduced when the main cargo fire
suppression system is activated.

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5
Q

Pack selector in AUTO, pack output temperature is determined by?

A

The left and right cabin temperature controllers:

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6
Q

Pack selector in STANDBY, pack output temperature is determined by?

A

The position of the pack selector:
- N (normal) - constant, moderate temperature
- W (warm) - full warm.

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7
Q

Are you able to get conditioned air without the use of the packs?

A

Yes. When a ground source of conditioned air is available.

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8
Q

L or R PACK TEMP means?

A

All pack control system faults or overheats.

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9
Q

An automatic control system fault or a pack outlet overheat requires:

A

Crew interaction

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10
Q

When an internal
pack overheat is detected:

A

The pack valve closes and the pack is shut down automatically.

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11
Q

PACK TEMP and L or R PACK OFF EICAS massage will be displayed together when?

A

When an internal
pack overheat is detected.

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12
Q

The pack controllers regulate the pack output air temperature to satisfy the
temperature requirement of the compartment requiring:

A

The coolest air

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13
Q

What does trim air?

A

Trim air adds hot air from the bleed air system to the to hottest compartments.

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14
Q

What does FLT DECK TEMP, FWD CABIN TEMP or AFT CABIN TEMP mean?

A

Zone temperature controller failure, compartment temperature control is in the OFF position (FWD and AFT
CAB only) or trim air switch is OFF

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15
Q

TRIM AIR means?

A

TRIM AIR switch is off

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16
Q

What happens when the trim air system is off?

A

The packs attempt to maintain all compartments at an average temperature.

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17
Q

The forward equipment cooling system supplies:

A

Cooling air to equipment in the
forward electronic equipment racks and the flight deck avionics.

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18
Q

FWD EQPT VAL means?

A

The system valves fail to reconfigure during automatic operation.

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19
Q

FWD EQPT OVHT means?

A

Low airflow or high temperature is sensed.

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20
Q

FWD EQPT SMOKE means?

A

Smoke is sensed in the forward equipment cooling ducts.

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21
Q

FWD EQPT COOLING means?

A

No cooling airflow is sensed after selecting OVRD.

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22
Q

The cargo heat system are provided heat from?

A

The bleed air system.

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23
Q

Regarding the cargo heat system, the system automatically maintains compartment temperature
above:

A

Approximately 45°F (7°C)

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24
Q

The BULK CARGO HEAT selector allows a higher temperature to be selected for
the bulk compartment. With the
selector in the VENT position, the bulk compartment is maintained above
approximately:

A

65°F (18°C)

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25
Q

FWD, AFT or BULK CARGO OVHT means?

A

The cargo compartment
temperature is above the standard control range.

26
Q

A compartment shutoff valve
closes automatically if a compartment temperature exceeds:

A

approximately 90°F
(32°C). When the compartment temperature decreases below the overheat temperature setting the OVHT light extinguishes, the EICAS message is removed, and the compartment shutoff valve re-opens.

27
Q

The Main Deck Temperature Selector determines which of two separate temperature control ranges will apply. Those are:

A
  1. ANIMAL/NORM: Suitable for cargo such as live animals that require moderate temperatures.
  2. PERISHABLE: Suitable for carrying cargo requiring cooler than moderate temperatures.
28
Q

Cabin pressurization is controlled by:

A

Adjusting the discharge of conditioned cabin
air through the outflow valve.

29
Q

What protects the
fuselage against excessive pressure differential?

A

The positive pressure relief valves and negative pressure relief doors.

30
Q

The pressurization system can be operated in which modes?

A

Automatic and manual

31
Q

What happens if the pressurization system in automatic mode fails?

A

It is automatically switched to the other auto mode. AUTO 1 to AUTO 2 or vice versa.

32
Q

How is the cabin pressurization
schedule calculated in automatic mode?

A

The pressurization system uses ambient pressure data from
the air data system in
conjunction with the selected cabin auto rate, the takeoff
altitude and the indicated landing altitude.

33
Q

How is the cabin pressurization during takeoff in automatic mode?

A

The system supplies a small positive pressurization to cause a smooth
cabin altitude transition.

34
Q

How is the cabin pressurization during climb in automatic mode?

A

Cabin altitude increases on a schedule related to the takeoff field elevation, airplane altitude, and the selected auto climb rate limit.

35
Q

What happens if the max cabin pressure differential is reached during climb?

A

Cabin climb rate becomes
a function of airplane climb rate, while maintaining the maximum differential
pressure.

36
Q

Whitch altitude is selected for the cruise cabin altitude?

A

The higher of the landing
altitude and the scheduled cabin altitude.

37
Q

What happens in the descent and landing in automatic mode regarding the pressuriziation system?

A

The cabin altitude decreases to slightly below the selected landing altitude. This ensures that the airplane lands pressurized.

38
Q

During landing the pressuriziation system in automatic mode will ensure the airplane lands pressurized. The barometric pressure correction comes from?

A

The captain’s altimeter.

39
Q

Regarding the pressuriziation system. What happens at touchdown?

A

The outflow valve opens to depressurize the airplane.

40
Q

CABIN ALTITUDE means?

A

The cabin altitude is above 10,000 feet.

41
Q

When will the CABIN ALTITUDE message be removed?

A

When the cabin altitude descends below 8,500 feet.

42
Q

CABIN AUTO INOP means?

A

Automatic pressurization control fails or when cabin
altitude MODE SELECT is MAN

43
Q

How is the positive pressure relief valves and negative pressure relief doors operated in conjuction with the pressuriziation control system?

A

It is not. It operate independently to protect the fuselage against excessive pressure differential.

44
Q

What happens when the cabin altitude exceeds 11,000 feet?

A

The system automatically close the outflow valve.

45
Q

Bleed air can be supplied by?

A

The engines, APU, or a ground air source.

46
Q

Bleed air is used for?

A
  • air conditioning
  • pressurization
  • engine start
  • wing and engine anti-ice
  • center hydraulic system air driven pump (ADP)
  • hydraulic reservoir pressurization
47
Q

When is the HP air used in the beed air system?

A

During descent and other low power setting operations.

48
Q

The engine bleed air valves may close when?

A
  • The APU is starting either engine.
  • Ground pneumatic air is
    connected
  • During periods of low engine bleed air demand (such as when the air conditioning packs are off)
49
Q

L or R ENG BLEED OFF means?

A

The engine bleed air valve is closed for a system fault.

50
Q

L or R ENG BLD OVHT means?

A

The engine bleed air temperature is excessive.

51
Q

L or R ENG HPSOV means?

A

The engine high pressure bleed air valve is open when
commanded closed.

52
Q

L or R ENG PRV means?

A

The pressure regulating valve is open when commanded closed.

53
Q

The APU bleed air is available up to?

A

17,000 feet.

54
Q

What prevents reverse flow of bleed air from the duct into the APU?

A

The check valve in the APU supply line.

55
Q

APU BLEED VAL means?

A

The APU bleed valve position disagrees with the commanded
position.

56
Q

The L and R bleed air isolation valves are normally closed. Except for?

A

Engine start or single bleed
source operation.

57
Q

The center bleed air isolation valve is normally?

A

In the open position.

58
Q

C, L or R BLD ISLN VAL means?

A

The bleed isolation valve position disagrees with
the commanded position.

59
Q

L or R BLD DUCT LEAK, BODY DUCT LEAK or STRUT DCT LEAK means?

A

A high temperature bleed air leak is detected.

60
Q

L or R ENG BLD OVHT means?

A

A higher than normal temperature is detected by the bleed air temperature sensor.

61
Q

What happens automatically if a bleed overheat occurs?

A

The engine bleed air valve is automatically closed

62
Q

If a bleed overheat situation has occured and the engine bleed air valve is closed. What will happen if engine anti-ice is activated?

A

It will cause the PRV to open to provide cowl anti-ice unless a strut duct leak exists.

Suppe (18 decks)

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