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B737CL Type Rating > Air System > Flashcards

Air System Flashcards

1
Q

Bleed air can be supplied from:

A

Engines, APU or external cart or source.

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2
Q

The following systems rely on the bleed air system for operation:

A
  • Air conditioning/pressurization
  • Wing and engine thermal anti-icing
  • Engine starting • Hydraulic reservoirs pressurization
  • Water tank pressurization
  • Aspirated TAT probe (as installed)
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3
Q

Engine bleed air is obtained from:

A

th and 9th stages of the compressor section.

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4
Q

The engine bleed air valve acts:

A

as a pressure regulator and shutoff valve

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5
Q

engine bleed air switch is

A

DC activated and pressure operated

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6
Q

BLEED TRIP OFF activates at …

A

490 F or 220 psi

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7
Q

Duct pressure indicator is…

A

AC Operated

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8
Q

Isolation valve is…

A

AC operated

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9
Q

Isolation valve position is not affected by…

A

the APU bleed air switch.

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10
Q

The APU Bleed valve is automatically closed when:

A

closes automatically when the APU is shut down

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11
Q

The APU bleed air valve is…

A

DC controlled and pressure operated.

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12
Q

thrust must be limited to … with the DUAL BLEED light illuminated.

A

Idle

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13
Q

A wing-body overheat condition is caused by a…

A

bleed air duct leak.

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14
Q

Excess air …, … , and … is combined in the mix manifold

A

from the left pack, air from the right pack, air from the recirculation system

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15
Q

Ram air system provides ….. for the heat exchangers.

A

Cooling air

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16
Q

On the ground, or during slow flight with the flaps not fully retracted, the ram air inlet doors move to …… for …. .

A

Full open / maximum cooling

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17
Q

In normal cruise, the doors …

A

modulate between open and closed.

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18
Q

The RAM DOOR FULL OPEN light illuminates whenever …

A

the ram door is fully open.

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19
Q

A turbofan is located in …

A

each ram air exit duct.

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20
Q

Turbofan augments the ram airflow …

A

on the ground or during slow flight (flaps not retracted)

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21
Q

The fan operates …

A

pneumatically using bleed air

22
Q

It is activated … , when …, by the … .

A

electrically, the pack is on, air-ground safety sensor or flap limit switch

23
Q

The deflector doors extends when activated … by … .

A

electrically / the air–ground safety sensor

24
Q

An overheat condition causes the pack valve to … and … light to illuminate.

A

close / the PACK TRIP OFF

25
Q

Air Conditioning Distribution

An overheat condition causes the appropriate mix valves to … and … light to illuminate

A

drive full cold / the DUCT OVERHEAT

26
Q

The recirculation fan system reduces … and … .

A

the air conditioning system pack load / the engine bleed air demand

27
Q

The recirculation fan is driven by … .

A

an AC motor

28
Q

The fan operates with the recirculation fan switch in… except with … .

A

AUTO / both packs on and one or both in HIGH

29
Q

Equipment cooling

Selecting the alternate fan should restore airflow and extinguish the OFF light within … .

A

Selecting the alternate fan should restore airflow and extinguish the OFF light within approximately 5 seconds.

30
Q

… pressure relief valves provide safety pressure relief by limiting the differential pressure to a maximum of …

A

Two / 8.65 psi

31
Q

DCPCS Airplanes

AUTO

A

Automatic pressurization control; normal mode of operation. Uses brushless DC motor

32
Q

DCPCS Airplanes

ALTN

A

Automatic pressurization control; alternate mode of operation. Uses brushless DC motor

33
Q

DCPCS Airplanes

MAN

A

Manual control of the system using DC motor.

34
Q

DCPCS Airplanes

In the automatic and alternate modes of operation, airplane altitude is provided by …

A

by the air data computers (ADCs)

35
Q

DCPCS Airplanes

The ADCs receive barometric corrections from ….

A

the Captain’s and First Officer’s altimeters.

36
Q

DCPCS Airplanes

The controller receives additional information from … , … , and ….

A

the air/ground sensor, the cabin pressure altitude sensing ports, and the stall management computer

37
Q

Cabin air outflow is controlled by …, … and …

A

the main outflow valve, the forward outflow valve , the flow control valve.

38
Q

When the flow control valve closes …

A

air is directed around the forward cargo compartment liner for inflight heating.

39
Q

DCPCS Airplanes

The main outflow valve is actuated by …

A

DC motors in any operating mode.

40
Q

DCPCS Airplanes

The cabin begins to pressurize on the ground when
N1 is …
N2 is …
after a time delay of …

A

greater than 60%,

greater than 89% and

1.5 seconds

41
Q

An amber OFF SCHED DESCENT light illuminates if

A

the airplane begins to descend without having reached the preset cruise altitude; for example, a flight aborted in climb and returning to the takeoff airport.

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

42
Q

If the FLT ALT indicator is changed …

A

the automatic abort capability to the original takeoff field elevation is lost.

43
Q

The cruise mode is activated when the …

A

airplane climbs to within 0.25 psi of the selected FLT ALT

44
Q

Selected FLT ALT :

At or below 28,000 feet

A

Differential pressure limit : 7.45 psid

45
Q

Selected FLT ALT:

Above 28,000 feet

A

7.80 psid

46
Q

The descent mode is activated when the airplane descends to …

A

0.25 psi below the selected FLT ALT

47
Q

DCPCS Airplanes An amber AUTO FAIL Light illuminates if any of the following conditions occurs:

A
  • Loss of DC power
  • Controller fault
  • Outflow valve control fault
  • Excessive differential pressure ( > 8.30 psi)*
  • Excessive rate of cabin pressure change (±2000 sea level feet/minute)* • High cabin altitude (above 15,800 feet)*.
48
Q

DCPCS Airplanes

With illumination of the AUTO FAIL light …

A

, the pressure control automatically transfers to the other auto controller (ALTN mode)

49
Q

Moving the pressurization mode selector to the ALTN position extinguishes the AUTO FAIL light, however the ALTN light remains illuminated to …

A

indicate single channel automatic operation.

50
Q

DCPCS Airplanes

Manual control of the cabin altitude is available if …

A

the AUTO and ALTN modes are inoperative

51
Q

The main outflow valve is driven by … at …

A

a DC motor / a slower rate than the automatic modes

52
Q

Outflow valve full range of motion can take up to …

A

20 seconds.

B737CL Type Rating (6 decks)

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