Pressurization Control Flashcards
What are the main components of the CPCS?
- Cabin Pressure Controller
- Cabin Outflow Valve (
- Negative Pressure Relief Valve (-0.5 psi)
- Positive Pressure Relief Valve (8.77 psi)
- Static Port
Pushing the Dump Switch on the pressurization panel in the flightdeck?
Will depressurize the cabin to an altitude of 12,400’ cabin altitude and deactivates the Recirculation Fans and ECS Packs - At a rate of 2000’/ min
Cabin Zone Temperature Control can be transfered from:
the Cockpit Control Panel to the Flight Attendant Control Panel
The Warning message “Cabin ALT Hi” together with a red cabin altitude indication will be displayed whenever the cabin altitude exceeds?
9700’
(“Caution” message at 8000’)
What are the Emergency Procedures for a “CABIN ALTITUDE HI” message?
- Crew Ox Masks: DON, 100%
- Crew Communications: ESTABLISH
- Altitude: 10,000’ or MEA (Whichever is higher)
- Thrust Levers: IDLE
- Speed Brake: FULL OPEN
- Airspeed: MAX/APPROPRIATE
- Transponder: 7700
- ATC: NOTIFY
During normal operations, Conditioned air consists of?
52 percent fresh air and 48 percent recirculation air
During cruice below 37,000’ the normal differential pressure is limited to?
7.8 psi
During cruice above 37,000’ the normal differential pressure is limited to?
8.34 psi
Max Altitude for Single Pack Operation?
FL310
Which of the following components regulate the air flow into the EPC Packs?
Flow Control Valve
The CPCS calculates a target cain altitude for each of the following CPCS flight modes:
Ground, Taxi, TakeOff, Climb, Cruise, Descent AND abort
the Positive Pressure Relief Valve (Safety Valve) opens independently whenever the differential pressure exceeds:
8.77 psi
The Emergency RAM Air Valve is commanded “Open” when?
Packs 1 & 2 are commanded/failed “Off” AND the Altitude is less than 25,000’
