Air Conditioning Flashcards

0
Q

Describe the gasper system.

A

Gasper fan pushes conditioned air through over head vents and other outlets in the cabin and cockpit.

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1
Q

What are the components of the air conditioning system?

A

2 environmental control units
Left ECU cockpit
Right ECU cabin
2 recirculating fans

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2
Q

What do the recirculating fans do?

How many?

A

2 fans mix conditioned and ambient air and send it throughout the cockpit and cabin.

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3
Q

How does the ground air get to the cabin?

A

Through the distribution lines directly.

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4
Q

When is ram air routed into the cabin?

A

When both ECU’s are off in flight.

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5
Q

What does the air cycle machine do?

A

Converts hot air supplied by the bleed system and converts it too cool conditioned air.

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6
Q

What are the components of the Environmental Control Unit?

A

Primary and secondary heat exchangers
ACM
Condenser
Water separator

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7
Q

What is the purpose of the pack valve?

A

Regulate the pressure of the air supplied to the ECU.

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8
Q

When will the pack valves close?

A
Pressure is above 55psi
Temperature is above 470F
Anti icing below 24,600 (left)
Takeoff or go around
Leak
Switched off
Engine start
Electrical power loss
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9
Q

When is a pack over heat message displayed?

A

When the pack outlet temperature is over 200F

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10
Q

How is temperature controlled?

A

ECU dual temperature control valve
One adds hot bleed air
One adds conditioned air

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11
Q

How do you switch from auto mode to manual mode?

A

12 o’clock position for 30 seconds then pull out.

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12
Q

What gives a pack overload message?

A

Too high pressure in pressure regulating shutoff valve

Too high of a temperature in the heat exchanger.

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13
Q

Can you turn the gasper fan off on the ground?

A

No, they are on as soon as dc buses are energized.

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14
Q

What is the gasper air used for?

A

Individual air outlets
Rear electronics compartment
02 compartment
Relay box

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15
Q

How is forward electronic bay cooled?

A

2 recirculating fans
2 exhaust fans
2 thermostat controls
NACA vents

16
Q

How is the rear electronics bay cooled?

A

Cabin air exhausted through the outflow valves.

On the ground, gasper vent