Pressurization Flashcards
What altitude does the Outflow Valve close automatically?
14,500
What is the indication when the alternate Cabin Pressure Controller has taken over?
ALTN annunciator light on the Cabin Pressure Panel
What happens if there is a fault detected when in AUTO mode?
- AUTO FAIL light illuminates
- Pressure controller automatically switches to the other CPC
- ALTN light illuminates
What happens if both CPC’s fail?
- AUTO FAIL light illuminates
- ALTN light extinguishes
What cabin altitude does the cabin altitude alert horn sound?
10,000
What powers the manual outflow valve motor?
DC standby system
What is the indication if the system is in manual?
MANUAL annunciator light
What should be done if a higher cabin altitude is desired?
Momentarily push the outflow valve switch to OPEN and verify the cabin altitude is rising
What should be done if a lower cabin altitude is desired?
Momentarily push the outflow valve switch to CLOSE and verify the cabin altitude is descending
When is the overboard exhaust valve open?
- On the ground
- In flight with low differential pressure
How can the overboard exhaust valve be forced open?
- Select either PACK switch to HIGH
- RECIRC FAN to OFF
What is maximum differential for Takeoff and landing?
.125 PSI
What causes the OFF SCHED DESCENT light to illuminate?
The airplane started descending before reaching the planned cruising altitude set in the FLT ALT indicator
What cancels the FLT ABORT mode?
Changing the FLT ALT indicator
When does the CRUISE pressurization schedule start?
When the aircraft altitude is with .25 PSI of the altitude set in the FLT ALT window
