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Systems For B737 Alaska > Air Systems > Flashcards

Air Systems Flashcards

1
Q

What sources supply air to the bleed air (pneumatic) system?

A

Engines, APU, or an external pneumatic air cart/source (on the ground)
SH 2.010 pg 1

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2
Q

What systems rely on bleed (pneumatic) air for operation?

A

Air Conditioning/Pressurization
Wing Thermal Anti-Icing
Engine Thermal Anti-Icing (respective engine bleed air) Engine Starting
Hydraulic Reservoir Pressurization
Water Tank Pressurization
Nitrogen Generation
SH 2.010 pg 1

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3
Q

What is the purpose of the Engine Bleed Air Valve, and how is it operated?

A

Acts as a pressure regulator and shutoff valve
*DC controlled, pneumatically actuated
Automatically closes when fire handle pulled & during engine start (isolate and ventilate)
SH 2.010 pg 5

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4
Q

What is the purpose of the Precooler System?

A

Precools the air
SH 2.010.3

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5
Q

What causes Bleed Trip Sensors to automatically close the Engine Bleed Air Valve?

A

Overheat or overpressure.
Associated with a Master Caution and AIR COND annunciator. SH 2.010 pg 5

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6
Q

How is the bleed trip condition reset?

A

Push the TRIP RESET switch
(Condition must no longer exist for a successful reset). SH 2.010 pg 5

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7
Q

What do the WING-BODY OVERHEAT, BLEED TRIP OFF, and DUAL BLEED amber lights on the Bleed Air Panel indicate? What causes these lights to illuminate?

A

WING-BODY OVERHEAT = leak in a critical area air duct (no reset possible)
BLEED TRIP OFF = overheat or overpressure (TRIP RESET possible)
DUAL BLEED = indicates APU bleed valve is open and
- engine #1 bleed switch is on, or
- engine #2 bleed switch is on and isolation valve is open
SH 2.010 pg 8

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8
Q

What is the purpose of the APU Bleed Air Valve, and how is it operated?

A

To provide bleed air to the left duct. *DC controlled, pneumatically operated. SH 2.010 pg 7

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9
Q

What is the purpose of the Isolation Valve?

A

The Isolation Valve isolates the left and right bleed air ducts during normal operations, when in the closed position.
SH 2.010 pg 8

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10
Q

What do the Isolation Valve positions CLOSE, OPEN, and AUTO do?

A

opens when any L/R pack or L/R engine bleed turned OFF (four corner switches)
CLOSE = forces valve closed, isolating L & R bleed air ducts OPEN = forces valve open, allowing flow between L & R AUTO = valve will be closed when
- Both engine bleeds are switched ON and
- Both Air Conditioning PACK switches are in AUTO or HIGH
SH 2.010 PG 8 and bleed air app

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11
Q

How do the Engine BLEED Air or Air Conditioning PACK switches impact operation of the Isolation Valve?

A

Turning any engine bleed air switch or pack switch OFF will OPEN the valve
*Isolation valve position is not affected by the APU BLEED AIR Switch
SH 2.010 PG 8 and bleed air app

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12
Q

Where is the external pneumatic air connection located?

A

Located on the right side of the aircraft (immediately aft of the right landing light) underneath a quick release access panel.
SH 2.010 pg 6

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13
Q

What is the path of conditioned air from an external (ground) source?

A

Pre-conditioned ground air enters directly into the mixing manifold downstream of the packs.
SH 2.020 pg 1

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14
Q

When connected to external air, which position should the PACK switches be in?

A

OFF - with external air connected, packs must be OFF (limitation)
Leaving packs on will reduce efficiency of external cart. Flight deck controls are ineffective for external preconditioned air.
SH 2.020 pg 15

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15
Q

What is the primary source of conditioned air to the Flight Deck? To the passenger cabin?

A

Flight Deck = Left pack Pax Cabin = Right pack and some left pack air through mix manifold
SH 2.020

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16
Q

How is the forward cargo compartment heated?

A

Exhaust air from the equipment cooling fans
SH 2.020 pg 16

17
Q

The aft cargo compartment?

A

Aft cargo is unheated.

18
Q

What do the PACK amber lights on the Bleed Air Panel indicate? What causes these lights to illuminate?

A

PACK (with MC/AIR COND) = overheat condition OR fault of both primary and secondary controllers (TRIP RESET possible)
PACK (on recall only) = failure of primary OR standby controller
SH 2.020 pg 5

19
Q

What happens with the Master Caution light during a failure of Primary pack control? Standby pack control?

A

Nothing - single failure is only shown in recall
Both fail? MASTER CAUTION and AIR COND annunciator with PACK light

20
Q

A single pack in high flow mode can maintain pressurization and comfort up to what altitude?

A

41,000ft
SH 2.020 pg 2

21
Q

Explain the auto logic for high airflow during normal operations and with a pack or engine failure.

A

In AUTO: Pack fails or engine fails? Automatically goes into HIGH with the flaps up
SH 2.020 pg 2, but use Bleed Air App schematic and click on the info button on the pack for the best information

22
Q

What controls pack temperature control?

A

Zone that needs the most cooling is what decides what the packs do, then the Trim Air System regulates the other 2 zones
SH 2.020 pg 2

23
Q

What is the purpose of the recirculation fans?

A

Reduces demand on the bleed air system and recirculates air.
RIGHT recirc fan takes air from holes in floor and runs it to mix manifold
LEFT recirc fan takes in air from the air conditioning distribution compartment SH 2.020 pg 9

24
Q

What is the purpose of the Equipment Cooling System?

A

Cools electronic equipment in the Flight Deck and the E/E bay. Smoke removal (drives to full open and allows smoke to escape) Heats FWD cargo compartment (keeps the puppies warm)
SH 2.020 pg 16

25
Q

What does the EQUIP COOLING OFF (amber) light indicate?

A

loss of airflow due to the failure of the respective Equipment Cooling Fan. (Checklist will lead you to use alternate fan)

26
Q

What causes the AUTO FAIL and OFF SCHED DESCENT amber lights to illuminate?

A

AUTO FAIL = primary controller has failed
SH 2.030 pg 11
OFF SCHED DESCENT
Aircraft begins to descend without having reached the preset cruise altitude. always set lower altitude before descending will extinguish if you return to altitude or set lower altitude
SH 2.030 pg 10

27
Q

How does the primary heat exchanger lower the bleed air temperature?

A

Ram air lowers the bleed air temperature. Insufficient ram air flow is augmented with an induction impeller driven by an extension of the air cycle machine (ACM) shaft.
SH 2.020 pg 5

28
Q

What is indicated by a bright blue RAM DOOR FULL OPEN light? Dim blue? Extinguished?

A

RAM DOOR FULL OPEN = Ram door full open Dim blue = never
Extinguished = closed or modulating
SH 2.020 pg 5

29
Q

What do the ALTN (green) light and MANUAL (green) light on the Cabin Pressurization panel indicate?

A

ALTN - Alternate pressurization mode is on and active
MANUAL - manual pressurization mode, selected by mode switch SH 2.030 pg 6

30
Q

What causes these lights to illuminate?

A

ALTN - manually selected or main CPC unit has failed (AUTO FAIL is illuminated)
MANUAL - mode selected to manual pressurization
SH 2.030 pg 6

31
Q

What does the Pressurization Mode Selector do?

A

Selects Cabin Pressure Controller mode
SH 2.030 pg 6

32
Q

Describe the 3 temperature control zones.

A

CONT CAB - flight deck FWD CAB - forward cabin AFT CAB - aft cabin

33
Q

What does an illuminated ZONE TEMP (amber) light indicate?

A

ZONE TEMP = controller failure or overtemp of the duct (trim air valve for that area automatically closes)
If all selectors turned OFF, Left pack goes to 75°F, Right pack goes to 65°F SH 2.020 pg 13

34
Q

What happens with the Master Caution light when ZONE TEMP illuminates?

A

Master caution (AIR COND) illuminates SH 2.020 pg 12

35
Q

What is the purpose of the Mix Manifold?

A

Mixes recirculated air with conditioned air from the packs
SH 2.020 pg 6

36
Q

On the Cabin Pressurization Panel, what do the FLT ALT indicator and LAND ALT indicator display?

A

FLT ALT - scheduled cruise altitude
LAND ALT - altitude of intended landing field SH 2.030 pg 7

37
Q

What are indications and impact of a panel failure?

A

Display 8888888 or all dashes
8888888 = panel is still operating with pressurization control
———– = panel is no longer operating (Dashes = trash)
SH 2.030 pg 7

38
Q

What is indicated by the CABIN ALTITUDE (red) light and the Cabin Altitude Warning Horn? How can this horn be silenced?

A

CABIN ALTITUDE = cabin altitude exceeds 10,000ft +/- 1000
Silenced with ALT HORN CUTOUT switch, located on the overhead panel SH 2.030 pg 14

Systems For B737 Alaska (5 decks)

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