CRJ 700 AIR SYSTEM
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What sources can supply the pneumatic system with pressurized air?
- The 6th or 10th stage of the left and right engine compressors
- The APU
- An external ground air source
What is the function of the Air Conditioning System Controller (ACSC)?
- Bleed source selection
- Valve operation
- Air distribution
What is the location of the engine start external ground air connector?
Aft left side of the fuselage
Where is the external ground air pressure (high pressure) monitored from the cockpit?
On the ECS synoptic page
What is the regulating function of the engine bleed valve (PRSOV)?
It limits the engine's discharge pressure to 45 psi +/- 3 psi.
How can the pilot manually close the bleed valves?
By using the manual portion of the Bleed Air Control Panel
What is the function of the high pressure valve (HPV)?
To supply 10th stage pressure to the pneumatic system when system demands exceed the capacity of the 6th stage.
What is the function of the APU Load Control Valve (LCV)?
- It opens to provide bleed air for ECS and engine starts
- It modulates to control the amount of bleed air taken from the APU
What unit controls the operation of the APU Load Control Valve (LCV)?
The APU Electronic Control Unit (ECU)
Which side of the bleed air manifold does the APU LCV deliver pneumatic pressure?
What is the function of the Isolation Valve?
It connects the left and right sides of the bleed manifold.
When does the Isolation Valve automatically open?
- During engine starts
- During automatic transfer of bleeds from the engines to the APU
When does the isolation valve automatically close?
During transfer of the bleeds from the APU to the engines
How can the pilot manually operate the Isolation Valve?
- Move the ISOL toggle switch on the Bleed Air Control Panel to the desired position
- Move the rotary selector switch on the Bleed Air Control Panel to MANUAL
What bleed source will supply the manifold if the APU and both engines are operating when on the ground with the bleed valve selector in auto mode?
When does the Air Conditioning System Controller (ACSC) switch from the APU to the engines as a bleed source after departure?
When the thrust levers are retarded from the takeoff detent
When does the ACSC switch from the engines to the APU as a bleed source during approach?
Flaps are greater than 20 degrees or the landing gear is down.
Is the APU capable of supplying bleed air to the anti-ice system?
What will occur if the APU is supplying bleed air to the manifold and either the cowl or the wing anti-ice switch is selected on with both engines operating?
The ACSC will close the APU LCV and transfer the bleed loading to the engines
What will occur if the APU is supplying bleed air to the manifold and either the cowl or the wing anti-ice switch is selected on with both engines shutdown?
- The ACSC will close the APU LCV
- The bleed manifold will become depressurized
- A BLEED MISCONFIG caution is displayed on the Primary Page
What occurs to the bleed air flow when the engine START switch light is pressed?
- The Isolation Valve opens
- Both Air Conditioning Pack Valves close
- The associated Start valve opens
- The engine's Air Turbine Starter engages
What is the function of the Bleed Air Leak Detection System?
The Bleed Air Leak Detection System monitors the bleed air and anti-icing ducts for leakage.
What is the function of the Anti-Ice Detection Controller (AILC)?
To continuously monitor for failure of the bleed air or anti-icing ducts and the integrity of both channels of the detection system.
What is the function of the CLSD position of the Bleed Valves Selector located on the Bleed Air Control Panel?
It allows the pilot to override the ACSC and close all aircraft bleed sources except air from an external air source.
What is the function of the AUTO position of the Bleed Valves Selector located on the Bleed Air Control Panel?
It allows the ACSC to control all aspects of bleed air management.
What is the function of the MANUAL position of the Bleed Valves Selector located on the Bleed Air Control Panel?
It allows the pilot to manually control the bleed air system with the exception of the protective interlocks, and the valve sequencing that occurs automatically during the engine start cycle.
What are the functions of the Environmental Control System (ECS) in the CRJ-700?
- Provide regulated conditioned air for the cockpit and cabin
- Provide ventilation for the aft cargo bay, avionics bay, and electronic displays
What air sources can supply the Environmental Control System (ECS)?
- The engine bleeds
- The APU
- An external source
Where are the Air Conditioning Packs located in the CRJ-700?
The aft equipment bay
Which part of the aircraft does Pack 2 normally supply?
The cabin, & aft cargo bay
Which part of the aircraft does Pack 1 normally supply?
How is the Temperature Control Valve regulated from the cockpit?
By positioning the Cockpit or Cabin rotary selector to desired position on the Air Conditioning Panel. The requested temperature can be read on the ECS synoptic page.
How is the manual temperature control mode regulated from the cockpit?
By means of the manual toggle switches on the Air Conditioning Panel
What does the pilot control in the air conditioning unit while in the manual mode of the operation?
He directly actuates the Temperature Control Valve.
What is the function and location of the Ram Air Intake Scoop for the air conditioning unit?
It is located at the base of the vertical fin and is used as the cooling medium for the air-to air heat exchangers.
Where is the ram air exhausted after passing through the primary and secondary heat exchangers of packs 1 and 2?
Exhausts vents on the left and right sides of the aft fuselage
How is cooling airflow maintained through the packs during ground operations with no ram air flow available?
A fan, mechanically driven by the air cycle machine, is installed in the ram air duct to increase the airflow through the duct for cooling of the heat exchangers.
What is the function of the ram air valve located in the air conditioning system?
If both air conditioning systems fail, it can be opened causing ram air to ventilate both the cockpit and the cabin.
What is the function and location of the low pressure Environmental Control System (ECS) air-ground connector?
It is located on the right side of the aft fuselage and allows preconditioned air to be introduced directly into the mixing manifold for distribution to the cockpit and cabin.
What is the function and location of the Recirculation Fans?
They are located in each exhaust duct and help draw cabin air through the dado plates into the mixing manifold where it is filtered and blended with conditioned air.
What provides supplemental heating to the potentially cold galley service door area?
An electric heater
How is the aft cargo bay heating and ventilation controlled?
By means of the Cargo Air switch located on the Air Conditioning Control panel
What occurs when the AFT CARGO SMOKE PUSH switchlight is selected?
- The electric heater shuts down
- The in-take and exhaust shutoff valves close
What will occur upon selecting the AFT CARGO switch to the OFF position?
Both the in-take and exhaust valves are closed and airflow through compartment is stopped.
What will occur upon selecting the AFT CARGO switch to the AIR position?
The in-take and exhaust valves open and allow recirculated air from the cabin to ventilate the aft cargo compartment.
What will occur upon selecting the AFT CARGO switch to the COND AIR position?
An electric heater will be energized if the compartment temperature falls below a preset value
How are the flight deck cathode ray tubes (CRT) cooled and ventilated?
- Air from the cockpit air conditioning duct
- Two Display Cooling Fans
How many Display Fans are utilized for cockpit cathode ray tube (CRT) cooling? Two
- What is the function of the GND AL T position of the DSPL Y FAN selector located on the center pedestal?
- It allows the fan normally used in flight to cool the CRT's on the ground in the event the ground fan fails.
What is the function of the NORM position of the DSPL Y FAN selector located on the center pedestal?
In this position, the flight fan operates to cool the CRT's while in flight and the ground fan operates to cool the CRT's while on the ground
What is the function of the STDBY position of the DSPL Y FAN selector located on the center pedestal?
Power is removed from both fans
What is installed to provide electronic equipment cooling located in the avionics bay?
Two avionics exhaust fans
What is the function of the Ground Valve?
- It opens on the ground to allow the air used to cool the avionics bay and CRT's to be dumped overboard
- It ensures that the aircraft remains unpressurized while on the ground
When does the Ground Valve open and close during normal operations?
- It closes on the ground when the passenger and galley doors are closed
- It opens with WOW at touchdown
How long is departure field elevation maintained after departure?
It is maintained until the aircraft maintained an altitude of 6,000 above the takeoff field elevation for 10 minutes
What is the function of the Pneumatic Safety Valves?
They provide overpressure and negative pressure relief
Where are the pressurization system indications displayed in the cockpit?
The Primary page and the ECS synoptic page
What is the function of the Cabin Pressure Controller (CPC)?
Two CPS's control all the automatic phases of pressurization
How can the pilots manually switch between Cabin Pressure Controllers 1 & 2?
By pressing the PRESS CONTROL switch light twice
What is the function and location of the Outflow Valve?
The Outflow Valve is located on the aft pressure bulkhead and controls the discharge rate of air from the aircraft.
How is the Outflow Valve controlled during manual mode of operation?
In manual mode, the outflow valve is controlled by toggle switches on the Cabin Press panel
What will the Ground Valve do if the EMER DEPRESS switch light is selected while on the ground?
It will reschedule its opening cycle from the normal 60 seconds to 2 seconds
What is the function of the PRESS CONT switch light on the Cabin Press control panel?
- Selecting it once changes to manual control of the system
- Selecting it twice switches between Cabin Pressure Controllers 1 & 2
What will occur after pressing the EMER DEPRESS switchlight on the Cabin Pressure Control Panel?
- Both the automatic and manual control of the pressurization system are overridden
- The MANUAL DC motor drives the outflow valve fully open In flight, the cabin altitude is restricted to a maximum of 14,500 feet +/- 500 feet
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