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The Cool Gang > 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?

WHAP PNES

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 powered, 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 bleed are switches are 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

How is heat provided to 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

** SE PACK is 25,000 if MEL

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 pressurization controller has failed to maintain control of pressure changes
  • loss of DC power
  • controller fault

Auto fail light WITHOUT ALTN light indicates dual controller failure. Five dashes —– will display in the FLT ALT and LAND ALT windows.

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

Bleed air is introduced into the primary heat exhanger where 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
bright 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 the ALTN or MANUAL 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

AUTO
ALTN
MAN
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

Using zone temp selectors

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

  • master caution is overheat
    Recall control failure
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
L pack r pack recirc fan pneumatic ground air

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

A panel failure after a DC power interruption will result in the display of 8888888 or all dashes in the FLT ALT and/or LAND ALT indicator. If cabin altitude and cabin rate are normal, automatic control of cabin pressure is not affected by the failure.

May have to monitor pressurization system to ensure normal operation

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

The Cool Gang (17 decks)

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