Pressurization Flashcards
Normally, air is discharged overboard to maintain cabin pressure through the ____.
a. cabin pressure relief valves
b. negative pressure relief valves
c. outflow valve
d. pressure regulator valve
c. outflow valve
At a normal pressure differential, the cabin can maintain _____ ft. altitude with an aircraft altitude of 41,000 ft.
a. 7,500
b. 9,900
c. 8,000
d. 7,000
c. 8,000
The Auto Pressurization System consists of ____ identical controllers with ____ controller(s) alternately sequenced as (the) primary operational unit(s) for each new flight.
a. 2/1
b. 2/2
c. 3/1
d. 3/2
a. 2/1
For the pressurization auto controller to function properly, ____ is required to be preset.
a. cruise altitude and takeoff altitude
b. landing altitude
c. landing altitude and cruise altitude
d. cruise altitude
c. landing altitude and cruise altitude
To switch the pressurization to the auto alternate controller, you ____.
a. must select STBY, then back to AUTO on the Cabin Pressurization Panel
b. cannot switch to alternate; pressurization controllers can only be sequenced automatically
c. must select MAN, then back to AUTO on the Cabin Pressurization Panel
d. must select ALTN on the Cabin Pressurization Panel
d. must select ALTN on the Cabin Pressurization Panel
The AUTO FAIL light will illuminate automatically due to ____.
a. cabin altitude in excess of 10,000’
b. loss of DC power
c. any of the above occurring
d. cabin rate of change in excess of +/- 1000 ft/min or cabin altitude in excess of 14,000 feet
b. loss of DC power
When the pressurization AUTO FAIL light illuminates and the ALTN light does not, which statement is true?
a. Both auto channels have failed.
b. An AC STBY BUS failure.
c. Cabin altitude 14,000
d. All of the above
a. Both auto channels have failed.
The OFF SCHEDULE DESCENT light illuminates. This is caused by the ____.
a. auto controller allowing the cabin to climb/descend at an excessive rate
b. auto controller failing
c. pilot starting a descent prior to reaching selected cruise altitude
d. auto controller not keeping up with the pressurization demands
c. pilot starting a descent prior to reaching selected cruise altitude
If an OFF SCHEDULE DESCENT light comes on, the pressurization system will ____.
a. recompute the new cruise altitude psi differential rate
b. return the cabin to the last cruise altitude
c. pressurize the cabin back to the takeoff airport altitude
d. reschedule the pressurization rate of change
c. pressurize the cabin back to the takeoff airport altitude
The pressurization outflow VALVE position indicator operates in ____ mode(s).
a. AUTO
b. ALTN
c. MANUAL
d. all of the above
d. all of the above
When operating cabin pressure in MANUAL, the third DC motor operates ____.
a. the same speed
b. on AC power, not DC
c. slower
d. faster
D. Faster
The safety pressure relief valves open at ____ psi.
a. 8.35
b. 8.25
c. 9.10
d. 8.45
c. 9.10
The automatic cabin pressure control system descent mode is activated when ____. Select the most correct answer.
a. the aircraft begins descent from the top of descent
b. the aircraft descends 0.25 psi below the selected value in the Flight Altitude (FLT ALT) Indicator.
c. over halfway to the destination airport and the selected value in the Landing Altitude (LAND ALT) Indicator is changed
d. either A or B occurs
b. the aircraft descends 0.25 psi below the selected value in the Flight Altitude (FLT ALT) Indicator
If the external atmospheric pressure exceeds the internal cabin pressure, the ____ will open.
a. negative pressure relief valve
b. overboard exhaust valve
c. outflow valve
d. positive pressure relief valve
a. negative pressure relief valve
This light will illuminate for all of the following conditions EXCEPT _____.
a. loss of DC power
b. controller or outflow valve control fault
c. cabin altitude at 14,000 feet
d. excessive ratio of cabin pressure change (+12,000 sea level feet/minute)
c. cabin altitude at 14,000 feet
This illuminated light on the Cabin Pressurization Panel indicates that _____
a. the primary controller has failed and the system has switched to the other auto controller (ALTN Mode)
b. the back-up auto controller (ALTN Mode) is unavailable if the primary controller should fail
c. neither pressure controller has failed
d. both pressure controllers have failed
d. both pressure controllers have failed
In this situation, the QRH directs placing the pressurization mode in ALTN. What indications should you have after this step is accomplished?
a. The AUTO FAIL and ALTN lights remain illuminated.
b. The AUTO FAIL light remains illuminated and the ALTN light extinguishes.
c. The AUTO FAIL light extinguishes and the ALTN light remains illuminated.
d. Both the AUTO FAIL and Al TN lights extinguish.
c. The AUTO FAIL light extinguishes and the ALTN light remains illuminated
After moving the Pressurization Mode Selector to ALT per the QRH, the AUTO FAIL light remains illuminated. The QRH now directs to move this switch to MAN. What affect does this step have on the pressurization system?
a. The manual controller moves the outflow valve at the same rate as the auto controllers.
b. The manual controller moves the outflow valve at a slower rate than the auto controllers.
c. The manual controller moves the outflow valve at a faster rate than the auto controllers.
d. All three controllers use the same motor to operate the outflow valve.
C. The manual controller moves the outflow valve at a faster rate than the auto controllers.
In flight, at 29,000 ft, these lights illuminate on the Cabin Pressurization Panel. What is the status of
the pressurization controllers?
a. The standby auto controller has failed and the primary auto controller is maintaining pressure.
b. Both the primary and standby auto pressure controllers have failed.
c. The primary auto controller has failed and the system did not automatically switch to ALTN Mode.
d. The primary auto controller has failed and the system has automatically switched to the standby auto controller (ALTN Mode).
d. The primary auto controller has failed and the system has automatically switched to the standby auto controller (ALTN Mode)
How does this condition affect the operation of the pressurization system?
a. The maximum pressure differential is less since we are using the standby auto controller.
b. The pressure differential is being maintained at the pressure relief valve limit.
c. The outflow valve will operate slower with the standby auto controller.
d. There is no difference in operation when using the standby auto controller
d. There is no difference in operation when using the standby auto controller.
The crew has elected to return to the departure airport. During descent, this light illuminates on the Cabin Pressurization Panel. What other crew action is required in conjunction with this light being on?
a. No other action is required.
b. The crew must change landing altitude only.
c. The crew must change flight altitude only.
d. The crew must change both flight altitude and landing altitude
a. No other action is required
The departure airport is now closed for weather and the crew elects to fly to an alternate destination at a flight altitude lower than planned. With this light on, the crew should _________.
a. leave the pressurization panel as it is.
b. change the FLT ALT window but not the LAND ALT window
c. change the LAND ALT window but not the FLT ALT window
d. change both the FLT ALT and LAND ALT windows
d. change both the FLT ALT and LAND ALT windows
What is the reason why this light originally illuminated?
a. The aircraft started descent prior to reaching the hallway point in the route.
b. The aircraft started descent prior to flying 400 NM.
c. The aircraft started descent prior to reaching the cruise altitude set in the FLT ALT window.
d. The aircraft started descent prior to reaching the altitude set in the LAND ALT window.
c. The aircraft started descent prior to reaching the cruise altitude set in the FLT ALT window.
