Pressurization Flashcards
T or F: the aircraft’s pressurization is provided by engine bleed air.
True.
Which valve is primarily manipulated to control the pressurization in the cabin of the aircraft?
Aft outflow valve.
How many safety valves are there in addition to the outflow valve?
Two.
How many different modes are there on the pressurization system?
Four: automatic, manual, emergency/smoke control, pressure dump.
Manual mode is used on the pressurization system for what reason?
If auto mode is inoperative.
Holding the spring-loaded toggle switch on the pressurization panel to the DECR side accomplishes what?
Opens the aft outflow valve to decrease cabin pressure by increasing cabin altitude.
Holding the spring-loaded toggle switch on the pressurization panel to the INCR side accomplishes what?
Closes the aft outflow valve to increase cabin pressure by decreasing cabin altitude.
If the aft outflow valve becomes inoperative, pressurization can be controlled by what?
The forward safety outflow valve.
Lifting the safety guard and rotating the forward safety outflow valve selector knob to the open position allows the ____ to be fully open during emergency operations.
Forward safety outflow valve.
When the pressurization system is in AUTO and the FWD outflow valve is rotated to the open position, it causes the AFT outflow valve to ____.
Close.
Which pressurization mode would be used to depressurize the aircraft most rapidly?
Dump.
T or F: when the pressurization system is set to DUMP, the aircraft can still be pressurized.
False.
If bleed air is unavailable in flight, the cabin and flight compartments can be ventilated with what?
Outside ram air.
The ram air vents used in flight when bleed air is not available are located on which part of the aircraft?
Dorsal fin.
What is the maximum pressure differential pressure permitted by the cabin pressure controller?
5.46 psi.
At 25,000 feet, what cabin altitude give you a 5.46 psi pressure differential?
8,000 feet.
At what altitude does the cabin press warning light illuminate?
9,800 feet.
During automatic pre-pressurization, the cabin is pressurized how many feet below takeoff field elevation?
400 feet.
The cabin pressure controller is in the takeoff mode for no longer than how many minutes after takeoff?
10 minutes.
Selecting the DUMP position on the pressurization system accomplishes what?
Fully opens the aft outflow valve.
When the pressurization mode switch is selected to the MAN position, which of the following is true?
Selecting INCR on the MAN DIFF switch closes the aft outflow valve.
T or F: the MAN DIFF switch on the pressurization panel should be used in both the auto and manual modes of pressurization.
False.
