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Systems1 > Pneumatics > Flashcards

Pneumatics Flashcards

1
Q

The OFF position of the air conditioning master switch closes all valves in the system except the _____

A

Alternate pressurization valve

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2
Q

The airplane altitude Differential Pressure Scale on the cabin pressure controller shows the _____

A

Maximum actual airplane altitude for the commanded cabin altitudes selected by the dial pointer at an 8.6 psi pressure differential

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3
Q

The door over the cabin pressure test valve handle was designed to close only when the handle is in the ______ position

A

Normal

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4
Q

The function of the bleed air crossover valve is to _____

A

Isolate the wing manifold into two sections

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5
Q

The cargo compartment temperature control switch controls the position of the alternate pressurization valve except when operated from the cockpit by setting _____

A

The left alternate pressurization switch to ON

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6
Q

The cabin manual pressure control knob can be used to depressurize the aircraft by rotating it _______ to the ______ position

A

Counterclockwise, full Decrease

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7
Q

The recommended maximum cabin altitude to maintain conditions for efficient crew operation is _______ feet for day and ______ feet for night

A

8000, 5000

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8
Q

The purpose of ground air ejector is to ________

A

Move ambient air through the heat exchangers for cooling during ground operations

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9
Q

The cabin temperature control knob is operative only when the air conditioning master switch is in _____

A

COND AIR

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10
Q

The alternate pressurization valve requires approximately ______ seconds to move from full open to full closed

A

20

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11
Q

When rotating the cabin altitude controller knob CCW, do not attempt to force the pointer beyond the internal stop at approximately ____

A

Minus 7000 ft

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12
Q

The manual position of the cabin temperature control rotary switch controls the position of the ______ to increase or decrease cabin temperature

A

Hot air bypass valve

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13
Q

The cargo compartment temperature regulator controls the position of the ______ valve when the air conditioning master switch is in the ______ position

A

Alternate pressurization, COND AIR or OFF

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14
Q

The ________ position of the cabin pressure test valve handle locks out the cabin pressure controller so all control of cabin pressure is through the manual pressure controller

A

Closed

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15
Q

When operating for extended periods at altitudes of 20,000 feet or below, the recommended cabin altitude for normal climb and cruise is ____

A

Field PA plus 500 ft

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16
Q

It is important not to operate the air conditioning system with right alternate pressure switch in ______ for an extended period of time. Distribution ducts will be exposed to high temperature bleed air and _____

A

Full INCREASE, Overheat

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17
Q

The _____ of the cabin altitude gage indicates actual cabin altitude while the ______ indicates the cabin differential pressure

A

inner scale, outer scale

18
Q

During ground operation with the air conditioning master switch in COND AIR, the crossover valve CLOSED and engines #1 & #2 not running, the _____

A

Air cycle machine will overheat from the lack of cooling though the heat exchangers.

19
Q

The OVHD PANEL caution light automatically comes on when _____ comes on

A

Any overpressure, over temp, or leak detect

20
Q

When the bleed air crossover valve is closed, bleed air from engines #1 & #2 is prevented from reaching the ____

A

Air conditioning system

21
Q

When the bleed air crossover valve is closed, bleed air from engine #3 & #4 is prevented from reaching the ____

A

Alternate pressurization valve and ground ejector

22
Q

Cabin temperature is maintained by mixing hot bleed air and cold air based on cabin control temperature selector setting. This is done either by automatic or manual control of the ________ valve

A

Hot air bypass

23
Q

The ON position of the left alternate pressurization switch bypasses the ____ and allows the use of the right alternate pressurization switch to control the position of the ________valve

A

Cargo compartment temperature regulator, alternate pressurization

24
Q

When does the CABIN PRESS light illuminate

A

12,000 feet (+/- 1,000ft)

25
Q

Air supplied by at least _____ ground carts is required before air conditioning system can be used to provide cooling air on the ground. Insufficient airflow will cause the ACM to _______.

A

2, Overheat and result in internal damage

26
Q

The ______ will automatically close due to an overpressure condition

A

Engine bleed valve

27
Q

When the LEAK DET light comes on it means temperature where is high?

A

Temperature in the engine strut is to high

28
Q

When the air conditioning master switch is in the COND AIR or OFF position, the cargo compartment temperature regulator controls the position of the ______ valve

A

Alternate pressurization

29
Q

Each engine has a set of 3 amber caution lights on the air conditioning control panel, labeled LEAK DET, OVER PRESS, and ____

A

OVER TEMP

30
Q

Why do we use RAM AIR position of the master switch to start engines?

A

Ensures all available air goes to the starter

31
Q

If the airplane fails to pressurize, the air vents near the ____ are convenient places to check for airflow in the control cabin

A

Sextant mount

32
Q

If the airplane fails to pressurize as desired, carefully consider the possibility of physiological consequences at cabin altitudes above ____ feet

A

18,000

33
Q

Airflow into the aircraft from the alternate pressurization valve is felt sooner in the _____ and the ___

A

Aft cargo compartment, Boom operator’s compartment

34
Q

The cabin pressure controller is used in conjunction with the _____ to automatically control the cabin pressure

A

Outflow valves

35
Q

The control cabin TEMPERATURE CONTROL knob only works when the MASTER switch is in the ______ position

A

COND AIR

36
Q

What cabin pressure controller components are controlled by the CABIN ALT knob

A

Cabin altitude pointer / Upper and Lower halves of the Airplane Altitude/Differential Pressure Scale

37
Q

Moving the MASTER switch to the RAM AIR position closes the _________, ______________ and _________ valves, and opens the __________ valve

A

air conditioning shutoff, alternate pressurization, ground air ejector; ram air

38
Q

Three __________ valves, one in each wheel well, regulate cabin pressure and prevent overpressurization

A

outflow

39
Q

While it’s in the primary and secondary heat exchangers, the bleed air is cooled by __________

A

RAM AIR

40
Q

If the cabin pressure controller fails, use the _____________ to maintain cabin pressure

A

MANUAL PRESSURE CONTROLLER knob

41
Q

Immediately before landing, what must you do if the crossover valve and engine bleed valves 1 and 2 are closed to prevent overheating?

A

Move the MASTER switch to the OFF position

42
Q

The CBN PRS warning light illuminates if cabin altitude is approximately _________ feet; it turns off by the time you descend to ____________ feet

A

12,000 ; 9,500

Systems1 (7 decks)

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