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SV STUDY GUIDE 737 > Air Systems / Pneumatics / Air Conditioning / Pressurization > Flashcards

Air Systems / Pneumatics / Air Conditioning / Pressurization Flashcards

1
Q

On the Cabin Pressurization Panel, what has occurred if both the amber AUTO FAIL light and the green ALTN
light is illuminated?

A
  • a single channel controller failure has occurred
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2
Q

The OFF SCHED DESCENT light indicates the aircraft began descent before having reached the planned cruise
altitude. What does the controller program the cabin to?

A
  • to land at the takeoff field elevation without further pilot inputs
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3
Q

Which stages of the compressor section is bleed air is obtained from (NG aircraft)?

A
  • 5th; 9th
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4
Q

The ___ high-stage valve modulates open to maintain proper pressure when 5th low-stage pressure is
insufficient (NG aircraft).

A
  • 9th
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5
Q

The engine bleed air valve is normally _____ operated and DC power activated.

A
  • pneumatically
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6
Q

What does the illumination of the BLEED TRIP OFF light indicate?

A
  • engine bleed air temperature or pressure exceeds a predetermined limit* engine bleed air temperature or pressure exceeds a predetermined limit
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7
Q

When the BLEED TRIP OFF light illuminates, what effect does this have on the engine bleed air system?

A
  • The respective engine bleed air valve closes automatically
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8
Q

The isolation valve is _____ when the isolation valve switch in AUTO, both engine bleed air switches ON, and
both air conditioning pack switches AUTO or HIGH.

A
  • closed
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9
Q

The isolation valve is _____ when the isolation valve switch in AUTO, if either an engine bleed air switch or
an air conditioning pack switch is positioned OFF.

A
  • open
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10
Q

Turning the APU bleed air switch OFF with the PACK switches in AUTO will cause the isolation valve to open.

A
  • False
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11
Q

The APU bleed air valve is___ operated and ______ activated.

A
  • pneumatically; DC
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12
Q

Engine thrust must be _______ with the DUAL BLEED light illuminated.

A
  • limited to idle
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13
Q

______causes a WING-BODY OVERHEAT condition.

A
  • a bleed air duct leak
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14
Q

Which WING-BODY OVERHEAT light will illuminate if a leak in the bleed duct from the APU occurs?

A
  • Left
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15
Q

The isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF with
the ISOLOATION VALVE switch in AUTO.

A
  • automatically opens
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16
Q

Conditioned air from which PACK, upstream of the mix manifold, flows directly to the flight deck?

A
  • left pack
17
Q

Air from the left pack, air from the right pack, and air from the recirculation system is combined within the

A
  • mix manifold
18
Q

On the ground, the APU can supply air for ________ for all operations.

A
  • two packs
19
Q

With the air conditioning PACK switches in AUTO and both packs are operating _________.

A
  • the packs provide “normal air flow”
20
Q

When one pack is operating, _________ with the air conditioning PACK switches in AUTO.

A
  • the operating pack provides high air flow
21
Q

Anytime the pack valve closes on the B737 -700, the air mix valves are driven to the _______ position
automatically.

A
  • full cold
22
Q

In the automatic temperature mode on the B737 -700, the ________ are operated by the automatic
temperature controller.

A
  • air mix valves
23
Q

The automatic temperature controller is bypassed when the temperature selector is positioned to ________
on the B737-700,

A
  • MANUAL
24
Q

The ram air system is used to provide cooling for what part of the air conditioning systems.

A
  • heat exchangers
25
Q

A DUCT OVERHEAT light causes the appropriate air mix valve to drive ___________ on a B737-700.

A
  • full cold
26
Q

When a PACK TRIP OFF light illuminates, the pack valve ________ on the B737-700.

A
  • automatically closes and the mix valve drives full cold
27
Q

In a B737-800, _______ if an amber ZONE TEMP light illuminates?

A
  • the MASTER CAUTION light will illuminate, and the trim air valve closes
28
Q

The recirculation fan system __________ the engine bleed air demand and air conditioning load.

A
  • reduces
29
Q

What does the TRIP RESET switch reset?

A
  • DUCT OVERHEAT on the B737-700, or the ZONE TEMP on the B737-800
  • BLEED TRIP OFF, PACK TRIP OFF
30
Q

On the B737-800, what is indicated by the PACK light?

A
  • a pack trip off or failure of both primary and standby pack controls
31
Q

Cabin air outflow controlled by______.

A
  • the outflow valve and the overboard exhaust valve
32
Q

On the Cabin Pressurization Panel, what does an illuminated amber AUTO FAIL light indicate?

A
  • automatic pressurization system failure is detected
33
Q

Manually positioning the outflow valve to OPEN will cause cabin altitude to _________.

A
  • Climb
34
Q

The main outflow valve is the overboard exhaust exit for the majority of the air circulated through the
passenger cabin and is actuated by one of _____ DC motors and

A
  • three
35
Q

On the cabin altitude panel, the ________on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS)
Indicator indicates the cabin altitude in feet.

A
  • inner scale
36
Q

On the cabin altitude panel, the _______ on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS)
Indicator indicates the differential pressure between cabin and ambient in psi.

A
  • outer scale
37
Q

The intermittent cabin altitude warning horn can be cut out ______.

A
  • By pushing the Altitude (ATL) HORN CUTOUT Switch
38
Q

At _______ cabin altitude the intermittent cabin altitude warning will sound.

A
  • 10,000 feet
39
Q

Cabin rate of climb displayed ______.

A
  • on the cabin rate of climb indicator

SV STUDY GUIDE 737 (15 decks)

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