Air Conditioning/ Pressurization/ Ventilation/ Pneumatics Flashcards
Function of SHUT position of the X BLEED Selector
Commands crossbreed valve closed, overriding the logic
Function of AUTO position of the X BLEED Selector
Auto logic controls opening and closing of the crossbleed valve.
-crossbleed valve commanded open when the APU bleed valve is open
-Crossbleed valve command closed when APU bleed valve is closed.
-Crossbleed valve commanded closed when a leak is detected
Function of OPEN position of the X BLEED Selector
Commands the crossbleed valve open, overriding the auto logic
Indications of the external high-pressure air being applied to the pneumatic system
With NO internal air source being provided (I.e apu or engine), a PSI valve is displayed on the left side of the ECAM BLEED page, By default the air source must be an external high-pressure air cart
Indications of the Engine Bleed Valves and High Pressure (HP) valves on the ECAM BLEED page
-Engine bleed valves are depicted next to the respective engines number (1 and 2) on. the lower portion of the page.
-HP valves are depicted on the lower portion of the page next to the white HP designator.
NOTE Intermediate Pressure (IP) check valves are not specifically depicted but are represented by a white IP designator.
Indications when APU air is in use
-APU bleed valve indicates open on the ECAM page
-APU BLEED is displayed in green on the memo section if the E/WD
Areas of the aircraft where bleed air leak can be detected.
WINGS: each wings bleed air duct
ENGINE PYLONS: are from the engine to the respective wing bleed duct
AFT FUSELAGE: area surrounding the APU bleed air duct.
Indications and effects of Zone Controller channel failures
-Primary channel failure-
ALTN MODE appears at the top of the ECAM COND page.
-Secondary channel operates as backup
-Flow setting function and optimized temp function are not available.
-HOT AIR and TRIM AIR valves close.
Indications and effects of Zone Controller channel failures (just a)
-Secondary Channel Failure-
Has no effect on zone temperature regulation.
-Backup mode is lost. Temperature indications are lost.
Indications and effects of Zone Controller channel failures
-Primary and Secondary channel failure-
PACK REG appears at the top of the ECAM COND page.
-Removes all information from the ECAM COND page.
-Optimized and backup temperature regulation lost
-Packs deliver a fixed temperature
Effect of Air Condition Pack Controller channel failures.
-Primary Channel Failure-
Secondary channel operates as backup.
-Pack flow is fixed at previous setting
Effect of Air Condition Pack Controller channel failures.
-Secondary Channel Failure-
Has no effect on pack flor regulation
-Backup mode is lost.
ECAM indications related to corresponding pack are lost
Effect of Air Condition Pack Controller channel failures.
-Primary and/or secondary channel failure-
Pack outlet temperature Is controller by the anti-ice valve.
-Outlet temperature
-ECAM indications related the pack are lost
Which cargo compartment is heated and ventilated
-Only the aft cargo compartment is temperature controlled, using the controls located on the overhead CARGO HEAT panel.
-Temperature of the aft cargo compartment cab be monitored by referencing the ECAM COND or CRUISE pages.
How many cabin pressure controllers are installed and where the active system is displayed on ECAM
-Two cabin pressure controllers (CPC)
-Designated as SYS1 and SYS2, the current active system can be viewed on the ECAM CAB PRESS page.
Describe how the active and standby pressurization controllers (CPCs) switch roles
Automatically:
-Shortly after each landing
-in the event the active controller fails
Manually
-Placing the MODE SEL pb to MAN for 10 seconds, and returning it back to AUTO mode.
Describe the function of the LDG ELEV selector
AUTO:
-FMCGs provide pressurization system with the landing field elevation.
OUTSIDE of AUTO:
-Landing field elevation is set manually
-Used when BOTH FMCGs have failed or when landing airport is not in the FMS database.
NOTE selector is calibrated in thousands, not in hundreds of feet (duh)
Describe the function of the normal pressurization controls
MODE SEL pb(pushbutton):
-Selecting MAN (light on) enables the use of the MAS V/S CTL toggle switch.
-Deactivated the AUTO pressurization mode.
MAN V/S CTL toggle switch:
-UP commands the outflow valve open, reducing cabin pressure increasing cabin altitude- “taking the cabin up”
DN commands the outflow valve closed, increasing cabin pressure- decreasing cabins altitude- “taking the cabin down”
In the event the flight must return return to the departure airport immediately after takeoff, what pressurization system action must be taken
Nothing as long as you don’t climb above 8,000 ft. The system will automatically return the cabin to match the takeoff altitude. This is called the abort mode.
Describe the DITCHING pb:
Placing the DITCHING (Sully) pb to ON commands the following openings to close:
-Outflow valve (if the MODE SEL pb is AUTO)
-Emergency Ram Air Inlet
-Avionics ventilations inlet and extract valves
-Pack control valves
NOTE: Each valve listed above is located below the aircrafts floatation line
Avionics compartments venting and cooling configuration which is not automatic and requires pilot action.
The AVIONICS SMOKE configuration requires pilot action in order to vent smoke within the avionics compartment
Placing the BLOWER and EXTRACT pbs to OVRD (white):
-allows additional air from the air conditioning system to enter the compartment
-forced all air within the compartment overboard.
NOTE: FAULT appears on the BLOWER and EXTRACT pb as the result of smoke being detected in the avionics compartment.
