Air Managment Flashcards
(30 cards)
List the items that use bleed air:
The bleed air is used for:
* Environmental Control System (ECS)
* Cargo heating system
* Main cabin door pressurized seal
* Cabin Pressure Control System (CPCS)
* Engine, wing, and horizontal stabilizer
anti-icing system
* Engine start system
When is the cabin temperature control transferred to the Cabin Managment Panel?
When the detent C is selected on the PAX
CABIN TEMPERATURE CONTROL KNOB
In the event of a bleed leak detection, what light will illuminate in addition to an associated CAS message?
In case of leak detection in the PACK, BLEED 1, BLEED 2 or BLEED APU the amber light will illuminate in addition to an associated CAS
When is the Outflow Valve (OFV) indication
on the Environmental Control System (ECS) synoptic page displayed?
The Outflow Valve (OFV) indication on the
Environmental Control System (ECS) synoptic page is only available on the ground.
What are the potential sources of bleed air that the Pneumatic System Controller (PSC) can automatically select from?
Engines, the APU and the external connections
Is it possible to have bleed from the APU and the engines simultaneously?
No
During normal operation on the ground and for taxiing, what is the primary source of bleed air?
APU
When will the bleed air source be automatically transitioned to the engines?
When the thrust lever TLAs are higher than 50°
What is the primary source of bleed air in
flight?
The engines
The XBSOV (cross bleed shut off valve) is automatically commanded to close for what conditions?
In case of bleed leakage, overpressure, engine fire or if a failure condition is identified, the XBSOV is automatically commanded to close.
If an external pneumatic power source is being used and is not adjustable, what range should the pressure supply be in?
If the equipment is not adjustable, make
sure the pressure supplied is between 32
PSI and 60 PSI.
Can an external ground connection be used to supply pressurized air for an engine start?
Yes, the external pneumatic power source
consists of a ground cart which must be connected to the HP ground connection. A dedicated high pressure engine start ground connection is available for engine starting.
When is fast cooling enabled on hot days?
When is fast warming enabled on cold days?
When the difference between the cabin/cockpit temperature set point and the cabin/cockpit temperature is equal to or higher than 6°C.
What happens to the recirculation fan during fast cooling and fast warming operations?
During fast cooling and fast warming operations, the recirculation fan automatically sets a higher speed, optimizing system performance
When is the emergency ram air door commanded to open?
In the event of loss of air conditioning pack
and pack backup systems, the PSC commands the emergency ram air door to open. The emergency RAM air door can be commanded open through the DUMP button on the PRESSURIZATION control panel.
How is the optional Cargo Heating System
controlled?
The Cargo Heating System is automatic and controlled through the PSC
When is the door seal pressurized?
– WOW indicating airplane in flight;
– Airspeed is higher than 60 kt;
– DOOR PAX SEAL FAIL CAS message is not displayed.
If the air conditioning pack fails what does the PSC automatically do?
When the pack fails, the PSC automatically
engages the pack backup operational mode and controls cabin and cockpit temperature to achieve the desired zone temperature of 24°C.
What is ram air ventilation used for?
Ram air ventilation is provided in case of
non-pressurized flight or for smoke evacuation.
What protects the fuselage against over and under pressure?
The Negative and Positive Pressure Relief
Valves (NPRV and PRV) are mechanically actuated valves and stay closed during normal operation. They will only open if the differential pressure limits are reached.
How can the outflow valve be modulated?
It can be modulated automatically or manually.
What does pushing in the MODE selector
button on the PRESSURIZATION panel allow for?
Manual control of the pressurization system through CABIN ALT knob.
What is the cabin altitude rate of change
when moving the CABIN ALT knob UP or
DN?
50 ft/min steps
What happens when the DUMP button is
pressed in the automatic mode of operation?
The cabin is depressurized at a constant rate of change of 2,000 ft /min up to 12,000 ft.
