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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
Air Conditioning Distribution An overheat condition causes the appropriate mix valves to ... and ... light to illuminate
drive full cold / the DUCT OVERHEAT
26
The recirculation fan system reduces ... and ... .
the air conditioning system pack load / the engine bleed air demand
27
The recirculation fan is driven by ... .
an AC motor
28
The fan operates with the recirculation fan switch in... except with ... .
AUTO / both packs on and one or both in HIGH
29
Equipment cooling | Selecting the alternate fan should restore airflow and extinguish the OFF light within ... .
Selecting the alternate fan should restore airflow and extinguish the OFF light within approximately 5 seconds.
30
... pressure relief valves provide safety pressure relief by limiting the differential pressure to a maximum of ...
Two / 8.65 psi
31
DCPCS Airplanes AUTO
Automatic pressurization control; normal mode of operation. Uses brushless DC motor
32
DCPCS Airplanes ALTN
Automatic pressurization control; alternate mode of operation. Uses brushless DC motor
33
DCPCS Airplanes MAN
Manual control of the system using DC motor.
34
DCPCS Airplanes | In the automatic and alternate modes of operation, airplane altitude is provided by ...
by the air data computers (ADCs)
35
DCPCS Airplanes The ADCs receive barometric corrections from ....
the Captain's and First Officer's altimeters.
36
DCPCS Airplanes The controller receives additional information from ... , ... , and ....
the air/ground sensor, the cabin pressure altitude sensing ports, and the stall management computer
37
Cabin air outflow is controlled by ..., ... and ...
the main outflow valve, the forward outflow valve , the flow control valve.
38
When the flow control valve closes ...
air is directed around the forward cargo compartment liner for inflight heating.
39
DCPCS Airplanes The main outflow valve is actuated by ...
DC motors in any operating mode.
40
DCPCS Airplanes The cabin begins to pressurize on the ground when N1 is ... N2 is ... after a time delay of ...
greater than 60%, greater than 89% and 1.5 seconds
41
An amber OFF SCHED DESCENT light illuminates if
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
If the FLT ALT indicator is changed ...
the automatic abort capability to the original takeoff field elevation is lost.
43
The cruise mode is activated when the ...
airplane climbs to within 0.25 psi of the selected FLT ALT
44
Selected FLT ALT : | At or below 28,000 feet
Differential pressure limit : 7.45 psid
45
Selected FLT ALT: Above 28,000 feet
7.80 psid
46
The descent mode is activated when the airplane descends to ...
0.25 psi below the selected FLT ALT
47
DCPCS Airplanes An amber AUTO FAIL Light illuminates if any of the following conditions occurs:
* 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
DCPCS Airplanes | With illumination of the AUTO FAIL light ...
, the pressure control automatically transfers to the other auto controller (ALTN mode)
49
Moving the pressurization mode selector to the ALTN position extinguishes the AUTO FAIL light, however the ALTN light remains illuminated to ...
indicate single channel automatic operation.
50
DCPCS Airplanes Manual control of the cabin altitude is available if ...
the AUTO and ALTN modes are inoperative
51
The main outflow valve is driven by ... at ...
a DC motor / a slower rate than the automatic modes
52
Outflow valve full range of motion can take up to ...
20 seconds.

B737CL Type Rating (6 decks)

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