Pressurization

Question 1

T/F: The aircraft’s pressurization is provided by engine bleed air.

Answer 1

TRUE

Question 2

Which valve is primarily manipulated to control the pressurization in the cabin of the aircraft?

Answer 2

The AFT Outflow Valve

Question 3

How many safety valves are there in addition to the Outflow Valve?

Answer 3

2 (AFT Safety Valve and FWD Safety Valve)

Question 4

How many different modes are there on the pressurization system?

Answer 4

4 control modes
AUTO
MANUAL
EMERGENCY/SMOKE REMOVAL
PRESSURE DUMP

Question 5

Manual mode is used on the pressurization system for what reason?

Answer 5

The AUTO mode is inoperative

Question 6

Holding the spring-loaded toggle switch on the pressurization panel to the DECR side accomplishes what?

Answer 6

DECREASES cabin pressure by opening the AFT Outflow Valve, this INCREASES cabin altitude

Question 7

Holding the spring-loaded toggle switch on the pressurization panel to the INCR side accomplishes what?

Answer 7

INCREASES cabin pressure by closing AFT Outflow Valve, this DECREASES cabin altitude

Question 8

If the AFT outflow Valve becomes inoperative, pressurization can be controlled by what?

Answer 8

FWD Safety Outflow Vave

Question 9

Lifting the safety guard and rotating the Forward Safety Outflow Valve selector knob to the open position allows the _____ to be full open during emergency operations.

Answer 9

FWD Safety Outflow Valve

Question 10

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 _____.

Answer 10

CLOSE

this clears smoke in the cockpit without depressurizing the aircraft

Question 11

Which pressurization mode would be used to depressurize the aircraft most rapidly?

Answer 11

DUMP mode

maximum smoke evacuation

Question 12

T/F: When the pressurization system is set to DUMP, the aircraft can still be pressurized.

Answer 12

FALSE, the aircraft will not pressurize because the AFT Outflow Valve is fully open

Question 13

If bleed air is unavailable in flight, the cabin and flight compartments can be ventilated with what?

Answer 13

Outside ram air through a NACA vent on the dorsal fin

Question 14

The ram air vents used in flight when bleed air is not available are located on which part of the aircraft?

Answer 14

The dorsal fin

Question 15

What is the maximum pressure differential pressure permitted by the cabin pressure controller?

Answer 15

5.46 PSI

Question 16

At 25,000 feet, what cabin altitude gives you 5.46 PSI pressure differential?

Answer 16

8,000 feet cabin altitude

Question 17

At what altitude does the cabin pressure warning light illuminate?

Answer 17

Cabin Altitude above 9,800 feet

Question 18

During automatic pre-pressurization, the cabin is pressurized how many feet below takeoff field elevation?

Answer 18

400 feet below takeoff field elevation (at a rate of -300 fpm)

Question 19

The cabin pressure controller is in the takeoff mode for no longer than how many minutes after takeoff?

Answer 19

10 minutes

Question 20

Selecting the DUMP position on the pressurization system accomplishes what?

Answer 20

Fully opens the AFT Outflow Valve

Question 21

When the pressurization mode switch is selected to the MAN position, which of the following is true?

Answer 21

Selecting INCR on the MAN DIFF switch closes the AFT Outflow Valve

Question 22

T/F: The MAN DIFF switch on the pressurization panel should be used in both AUTO and MANUAL modes of operation.

Answer 22

FALSE, the MAN DIFF switch is used in MANUAL mode only