Pneumatics Flashcards
The OFF position of the air conditioning master switch closes all valves in the system except the _____
Alternate pressurization valve
The airplane altitude Differential Pressure Scale on the cabin pressure controller shows the _____
Maximum actual airplane altitude for the commanded cabin altitudes selected by the dial pointer at an 8.6 psi pressure differential
The door over the cabin pressure test valve handle was designed to close only when the handle is in the ______ position
Normal
The function of the bleed air crossover valve is to _____
Isolate the wing manifold into two sections
The cargo compartment temperature control switch controls the position of the alternate pressurization valve except when operated from the cockpit by setting _____
The left alternate pressurization switch to ON
The cabin manual pressure control knob can be used to depressurize the aircraft by rotating it _______ to the ______ position
Counterclockwise, full Decrease
The recommended maximum cabin altitude to maintain conditions for efficient crew operation is _______ feet for day and ______ feet for night
8000, 5000
The purpose of ground air ejector is to ________
Move ambient air through the heat exchangers for cooling during ground operations
The cabin temperature control knob is operative only when the air conditioning master switch is in _____
COND AIR
The alternate pressurization valve requires approximately ______ seconds to move from full open to full closed
20
When rotating the cabin altitude controller knob CCW, do not attempt to force the pointer beyond the internal stop at approximately ____
Minus 7000 ft
The manual position of the cabin temperature control rotary switch controls the position of the ______ to increase or decrease cabin temperature
Hot air bypass valve
The cargo compartment temperature regulator controls the position of the ______ valve when the air conditioning master switch is in the ______ position
Alternate pressurization, COND AIR or OFF
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
Closed
When operating for extended periods at altitudes of 20,000 feet or below, the recommended cabin altitude for normal climb and cruise is ____
Field PA plus 500 ft
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 _____
Full INCREASE, Overheat
The _____ of the cabin altitude gage indicates actual cabin altitude while the ______ indicates the cabin differential pressure
inner scale, outer scale
During ground operation with the air conditioning master switch in COND AIR, the crossover valve CLOSED and engines #1 & #2 not running, the _____
Air cycle machine will overheat from the lack of cooling though the heat exchangers.
The OVHD PANEL caution light automatically comes on when _____ comes on
Any overpressure, over temp, or leak detect
When the bleed air crossover valve is closed, bleed air from engines #1 & #2 is prevented from reaching the ____
Air conditioning system
When the bleed air crossover valve is closed, bleed air from engine #3 & #4 is prevented from reaching the ____
Alternate pressurization valve and ground ejector
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
Hot air bypass
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
Cargo compartment temperature regulator, alternate pressurization
When does the CABIN PRESS light illuminate
12,000 feet (+/- 1,000ft)
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 _______.
2, Overheat and result in internal damage
The ______ will automatically close due to an overpressure condition
Engine bleed valve
When the LEAK DET light comes on it means temperature where is high?
Temperature in the engine strut is to high
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
Alternate pressurization
Each engine has a set of 3 amber caution lights on the air conditioning control panel, labeled LEAK DET, OVER PRESS, and ____
OVER TEMP
Why do we use RAM AIR position of the master switch to start engines?
Ensures all available air goes to the starter
If the airplane fails to pressurize, the air vents near the ____ are convenient places to check for airflow in the control cabin
Sextant mount
If the airplane fails to pressurize as desired, carefully consider the possibility of physiological consequences at cabin altitudes above ____ feet
18,000
Airflow into the aircraft from the alternate pressurization valve is felt sooner in the _____ and the ___
Aft cargo compartment, Boom operator’s compartment
The cabin pressure controller is used in conjunction with the _____ to automatically control the cabin pressure
Outflow valves
The control cabin TEMPERATURE CONTROL knob only works when the MASTER switch is in the ______ position
COND AIR
What cabin pressure controller components are controlled by the CABIN ALT knob
Cabin altitude pointer / Upper and Lower halves of the Airplane Altitude/Differential Pressure Scale
Moving the MASTER switch to the RAM AIR position closes the _________, ______________ and _________ valves, and opens the __________ valve
air conditioning shutoff, alternate pressurization, ground air ejector; ram air
Three __________ valves, one in each wheel well, regulate cabin pressure and prevent overpressurization
outflow
While it’s in the primary and secondary heat exchangers, the bleed air is cooled by __________
RAM AIR
If the cabin pressure controller fails, use the _____________ to maintain cabin pressure
MANUAL PRESSURE CONTROLLER knob
Immediately before landing, what must you do if the crossover valve and engine bleed valves 1 and 2 are closed to prevent overheating?
Move the MASTER switch to the OFF position
The CBN PRS warning light illuminates if cabin altitude is approximately _________ feet; it turns off by the time you descend to ____________ feet
12,000 ; 9,500
