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717 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

When is the avionics cooling switch operative
Fan Mode
OVRD Mode

A

Inflight only and is used to control radio rack cooling

Fan- Primary fan cools the radios if the primary fan fails, the backup fan comes on automatically

OVRD- The radio rack fans are off, the venturi valve is commanded open and venturl airflow cools the radios

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2
Q

What happens to the Avionics Cooling fan on the ground

A

Both fans stay on all the time and the venturi valve is closed

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3
Q

RAM Air Switch
OFF
ON

A

OFF- Ram Air Valve commanded closed

ON- Ram Air Valve Commanded open, allowing ram air to enter the air conditioning ducts

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4
Q

Ram in inflight

A

Provides ventilation for the cabin/cockpit when air conditioning is not available

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5
Q

Can you use the RAM Air on position on the ground?

A

No

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6
Q

AC Pack Shutdown Switch
AUTO
OVRD

A

Auto- Allows Automatic Pack shutdown in the event of a engine failure
OVRD- Overides the auto pack shutdown in the event of a engine failure or when the packs are shut off on the FMC.

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7
Q

When is the auto AC pack shutdown feature disarmed

A

Above 3000 AGL

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8
Q

When will both AC packs automatically shut down

A

If either engine fails during takeoff or if selected off in the FMS

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9
Q

What happens to AC Pack if a high supply duct temp is sensed

A

Pack shutsdown automatically and cannot be overridden

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10
Q

Flow Switch Positions
NORM
High

A

NORM- The flow control valve solenoide is energized to provide a lower airlow rate
HIGH- The flow contol valve solenoid is de-energized to provide a higher airflow rate

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11
Q

What postion must the flow switch be in for takeoff

A

NORM

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12
Q

ISOL Switch Position
CLSD
OPEN
AUTO

A

CLSD - Isolation valve is commanded closed, Isolating the left and right pneumatic systems

OPEN- Isolation valve is commanded open, allowing crossfeed of left and right pneumatic system

AUTO- Automatically controled by pneumatic system controller. Allows Auto crossfeed of left and right pneumatic system during one bleed source operation with ice protection on.

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13
Q

Where is Cabin Altitude and Cabin Rate displayed

A

AIR SD and Secondary Engine SD

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14
Q

Instrument Panel Flow Indicator
ON
OFF

A

On- on the ground, with AC off, indicates intrument panel cooling fan airflow
OFF- on the ground, with AC off, indicates the absence of airflow and cooling fan failure

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15
Q

Gasper Fan Switch
ON
OFF

A

ON- Provides Supplemental Airplane Ventilation with or without air conditioning packs operating.

OFF- Booster fan is not on, switch is extinguished

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16
Q

Cabin Press control panel button illuimination
Select
Manual

A

Select- Illuminates to indicate failure of both automatic cabin pressure controllers.

Manual- When pushed, MANUAL illuminates and the cabin pressurization system operates in manual mode. Also Used to alternate control between cabin pressure controllers (Auto 1 and Auto 2).

17
Q

How to turn the packs on/off in the FMC - Takeoff with Air Conditioning Packs off (2)

A

TO/APPR key……………………..Push
PACKS……………………………….Line select ON to OFF
Observe PACKS ALL OFF alert message on EAD

18
Q

What happens when AC Packs switches are in AUTO?

A

Both packs will automatically shutdown in the event of a engine failure.

19
Q

AIR DATA Heat Pushbutton

OFF

A

OFF- (amber light) all air data system heaters are off
The light is dark when all heater circuits are on for pitots, rudder limiter, stall probes, static ports, and RAT probes are energized.

20
Q

RAT probe heat on the ground is……

A

Inhibited

21
Q

WING ICE DET Switch
RESET
TEST

A

RESET- resets system and removes WING ICE DETECTED alert from the EAD. System will not reset if ice is detected.

TEST- test the wing ice detection system

22
Q

When does the wing ice detection system function

A

On the ground only and alerts the pilots to the pressence of wing upper surface ice. Inhibited during takeoff, landing and inflight

23
Q

Can you takeoff with WING ICE DETECTED alert displayed

A

NO

24
Q

Which cockpit windows are electrically heated and/or anti fogged

A

Three Pilot windshields are electrically anti-iced and electrically anti-fogged
The Clear view windows are anti-fogged

25
Q

Which controll surfaces are anti-iced with engine bleed air

A

Wing, Slats and horizontal stab leading edge

26
Q

Which engine controls anti-iced system

A

Either or both engines

27
Q

Which engine conponents are anti-iced

A

Engine nose cowl and provides ground and inflight anti-ice heat.
Engine anti-ice is independent of airfoil systems.

28
Q

WINDSHIELD ANTI-FOG Switch
OFF
ON

A

OFF- Turns off windshield and clearview anti-fog

ON- Turns on windshield and clearview anti-fog

29
Q

When is WINDSHIELD ANTI-FOG Switch available

A

During ground and flight operations

30
Q

WINDSHEILD ANTI-ICE Switch
OFF
ON

A

OFF- Turns off windshield anti-ice

ON- Turns on windshield anti-ice

31
Q

When is WINDSHEILD ANTI-ICE Available

A

During ground and flight operations

32
Q

What altitude is the auto pack shutdown feature disarmed….

A

3000 ft AGL

717 (16 decks)

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