Air Conditioning Panel Flashcards
AIR CONDITIONING PANEL
Q: The pneumatic system is monitored and controlled by?
Ref: (FOM VOL. III-DSC-36-10-10)
2 Bleed Monitoring Computers (BMC)
AIR CONDITIONING PANEL
Q: If one BMC fails, can the other take over?
Ref: (FOM VOL. III-DSC-36-10-20, FOM VOL. III-DSC-36-10-60)
Yes, they are interconnected. If BMC 1 fails:
- APU and ENG 1 leak detection are not monitored
- ECAM APU BLEED LEAK warning is lost
AIR CONDITIONING PANEL
Q: The PACK FLOW selector has LO, NORM, and HI positions (A319/320). What does this allow us to do?
Ref: (FOM VOL. III-DSC-21-10-50)
Select pack flow rates representing LO 80%, NORM 100%, and HIGH 120% of NORM
AIR CONDITIONING PANEL
Q: What flow rate is automatically selected when APU bleed air is in use or during single pack operation?
Ref: (FOM VOL. III-DSC-21-10-50)
Hi
AIR CONDITIONING PANEL
Q: When should the PACK FLOW selector not be in the normal position?
Ref: (FOM VOL. II, Section 3.05)
IF A/C 201-299, 301-399, AND 910-999 (A319/320):
- LO: If the number of passengers is below 115.
- NORM: For normal operating conditions.
- HI: For abnormally hot and/or humid conditions.
IF A/C 701 – 799 (A321):
- ON: For ECON flow if the number of passengers is below 140.
- OFF: For normal flow.
AIR CONDITIONING PANEL
Q: If the engine bleed air in-flight is too low what will occur?
Ref: (FOM VOL. III-DSC-21-20-30)
Minimum idle engine speed is automatically increased to provide adequate bleed air pressure
AIR CONDITIONING PANEL
Q: What would cause an amber FAULT light to illuminate in the PACK 1 and/or Pack 2 pushbutton (OOD)?
Ref: (FOM VOL. III-DSC-21-10-50)
- Overheat - Pack outlet
- Overheat - Compressor outlet
- Disagreement - Switch position disagreement with pack flow control valve
Note: FAULT light will be illuminated when no bleed air is supplied
AIR CONDITIONING PANEL
Q: What does the amber FAULT light in the APU BLEED pushbutton indicate? STOP HERE
Ref: (FOM VOL. III-DSC-36-20)
Bleed leak (APU bleed valve closes)
AIR CONDITIONING PANEL
Q: What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED pushbutton (OOLD)?
Ref: (FOM VOL. III-DSC-36-20)
- Overpressure - Downstream of the bleed valve
- Overheat
- Leak - Low pressure
- Disagreement - APU bleed valve open and engine bleed valve not closed or
- Engine Start with bleed valve not closed
AIR CONDITIONING PANEL
Q: What are the two functions of the engine bleed valves?
Ref: (FOM VOL. III-DSC-36-10-20)
To Act as:
- Pressure regulation
- Shut off valves
AIR CONDITIONING PANEL
Q: At what cabin differential pressure does the RAM AIR valve open?
Ref: (FOM VOL. III-DSC-21-10-20)
ΔP less than 1 PSI
AIR CONDITIONING PANEL
Q: What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?
Ref: (FOM VOL. III-DSC-36-10-40)
- When APU bleed valve is OPEN, the X-Bleed valve is open
- When APU bleed valve is CLOSED, the X-Bleed valve is closed
- X-Bleed also CLOSES for wing, pylon, or APU duct leak (except during engine start)
AIR CONDITIONING PANEL
Q: What causes the Pack Flow Control valve to automatically close?
Ref: (FOM VOL. III-DSC-21-10-50)
- Upstream pressure below minimum
- Pack overheat
- Engine start sequence
- Engine FIRE pushbutton on the related side pressed
- DITCHING pushbutton is selected
AIR CONDITIONING PANEL
Q: What does an amber FAULT light in the HOT AIR pushbutton indicate?
Ref: (FOM VOL. III-DSC-21-10-50)
Duct overheat - the Hot Air and Trim Air valves close automatically
AIR CONDITIONING PANEL
Q: How many Air Conditioning System Controllers are there?
Ref: (FOM VOL. III-DSC-21-10-10)
2. Each Air Conditioning System Controller has 2 lanes – (Active/Standby)
AIR CONDITIONING PANEL
Q: Describe how the Air Conditioning System Controllers regulate temperature?
Ref: (FOM VOL. III-DSC-21-10-30)
- Basic temperature regulation: Both packs produce the required outlet temperature determined by the lowest demanded zone temperature.
- Optimized temperature regulation: Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperatures.
AIR CONDITIONING PANEL
Q: What occurs when an active lane of an Air Conditioning System Controller fails?
Ref: (FOM VOL. III-DSC-21-10-40)
The second lane takes over
AIR CONDITIONING PANEL
Q: What occurs when both lanes of an Air Conditioning System Controller fails?
Ref: (FOM VOL. III-DSC-21-10-40)
The related pack is lost. The hot air pressure regulating valve and associated trim air valve(s) close.
AIR CONDITIONING PANEL
Q: How does the Air Conditioning System Controller configure its associated pack ram air inlet flap for takeoff and landing to avoid the ingestion of foreign matter?
Ref: (FOM VOL. III-DSC-21-10-30)
Takeoff:
- Pack Ram Air Inlet Flap closes when takeoff power is set and the main landing gear struts are compressed.
- Reopens after main landing gear strut extension
Landing:
- Pack Ram Air Inlet Flap closes as soon as the main landing gear struts are compressed and speed ≥ 70 knots.
- Opens 20 seconds after speed < 70 knots
AIR CONDITIONING PANEL
Q: If an air cycle machine (ACM) fails, what occurs?
Ref: (FOM VOL. III-DSC-21-20-40)
The affected pack will operate as a heat exchanger
AIR CONDITIONING PANEL
Q: What effect will the engine start sequence have on the pack flow control valves?
Ref: (FOM VOL. III-DSC-21-10-20)
The pack flow control valve will close automatically
AIR CONDITIONING PANEL
Q: After engine start with the APU BLEED pushbutton ON, what source is supplying bleed air to the packs?
Ref: (FOM VOL. III-DSC-36-10-20)
APU Bleed
AIR CONDITIONING PANEL
Q: When does the Lav/Galley Extract Fan operate?
Ref: (FOM VOL. III-DSC-21-30-50)
Continuously when electrical power is available
