PNEUMATICS, AIR CONDITIONING, AND PRESSURIZATION (ASM) Flashcards

1
Q

Where does the pneumatic system get air from

A

Engine compression stage
APU
Ground source

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2
Q

When is the 14th stage used

A

Low thrust
Engine cross bleed start
Anti-Ice operations

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3
Q

How many ECU are there

A

2 ECU

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4
Q

What does the left ECU control

A

Cockpit

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5
Q

What does the right ECU control

A

Cabin

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6
Q

What distributes the air

A

The gasper system

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7
Q

What happens if both ECU fail

A

Ram Air Inlets open

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8
Q

Purpose of recirculation fans

A

2 electrical fans mix fresh air for passenger comfort

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9
Q

Where does the ECU get air from

A

Bleed air from pneumatic system

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10
Q

Where is pressure from the ECU regulated by

A

The pack valve

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11
Q

After pack valve where does the airflow go

A

Divided into 2 lines, a cold air that goes through air cycle machine. Hot air bypasses air cycle machine.

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12
Q

What happens to air in the Air Cycle Machine

A

Cooled in primary heat exchanger, then goes through secondary heat exchanger where is cooled again.

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13
Q

What controls cabin temperature in AUTO MODE

A

Controlled by Digital Controller

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14
Q

What controls cabin temperature in MANUAL MODE

A

Temperature control module

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15
Q

Where does the pressurization system receive static pressure from

A

The static ports

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16
Q

Purpose for pressurization pressure systems

A

For overpressure and negative pressure relief functions

17
Q

What controls the pressurization in automatic mode

A

The digital controller

18
Q

How do the outflow valves work in automatic mode

A

The pneumatic outflow valve is slaved to the electropneumatic outlfow valve

19
Q

How is Theoretical Cabin Altitude calculated

A

So that maximum cabin differential pressure (7.8PSI) is reached at lowest possible airplane altitude

20
Q

When does the automatic pressurization sequence on the ground occure

A

Plane on ground, engine 1 thrust lever set to THRUST SET

21
Q

When does automatic pressurization takeoff sequence begin

A

Initiated once airplane leaves ground

22
Q

When does automatic pressurization takeoff sequence end

A

Until theoretical cabin altitude is greater than actual cabin altitude or 15 minutes (whichever is first)

23
Q

When does automatic de-pressurization on ground occur

A

On ground, engine 1 thrust lever idle

24
Q

To avoid pressure bump during de-pressurization

A

Landing altitude -300 feet

25
What is de-pressurization controlled at
Rate of 650 fpm
26
What valve operates during manual mode
Only the pneumatic outflow valve (electropneumatic valve stays closed)
27
When do the exhaust fans and shutoff valves open in the forward electronic bay
Once temperatures reach 75ºF
28
When do the exhaust fans and shutoff valves close in the forward electronic bay
Once temperatures drop below 66ºF
29
How is the rear electronic bay cooled
Door closed: Conditioned air from cabin On ground: Gasper fans
30
How is the baggage compartment ventilated
Recirculation fan