AIR CONDITIONING PANEL Flashcards
The pneumatic system is monitored and controlled by?
2 Bleed Monitoring Computers (BMC)
If one BMC fails, can the other take over?
a. Yes, they are interconnected. If BMC 1 fails:
b. APU and ENG 1 leak detection are not monitored
c. ECAM APU BLEED LEAK warning is lost
The PACK FLOW selector has LO, NORM, and HI positions (A319/320). What does this allow us to do?
Select pack flow rates representing LO 80%, NORM 100%, and HIGH 120% of NORM
What flow rate is automatically selected when APU bleed air is in use or during single pack operation?
HI
When should the PACK FLOW selector not be in the normal position?
a. Less than 115 guests, select LO
b. Hot and humid conditions, select HI
c. During Smoke/Fumes removal, select HI as per the procedure
If the engine bleed air in-flight is too low what will occur?
Engine speed is automatically increased to provide adequate bleed air pressure
What would cause an amber FAULT light to illuminate in the PACK 1 and/or Pack 2 push button (OOD)?
a. Overheat - Pack outlet
b. Overheat - Compressor outlet
c. Discontinuity - Switch position disagreement with pack flow control valve
d. Note: FAULT light will be illuminated when no bleed air is supplied
What does the amber FAULT light in the APU BLEED push button indicate?
Bleed leak (APU bleed valve closes)
What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED push button (OOLD)?
a. Overpressure - Downstream of the bleed valve
b. Overheat
c. Leak - Low pressure
d. Discontinuity - APU bleed valve open and engine bleed valve not closed or
e. Engine Start with bleed valve not closed
What are the two functions of the engine bleed valves?
a. Pressure regulation
b. Shut off valves
At what cabin differential pressure does the RAM AIR valve open?
1 PSI ΔP or less
What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?
a. When APU bleed valve is OPEN, the X-Bleed valve is open
b. When APU bleed valve is CLOSED, the X-Bleed valve is closed
c. X-Bleed also CLOSES for wing, pylon, or APU duct leak (except during engine start)
What causes the Pack Flow Control valve to automatically close?
a. Upstream pressure below minimum
b. Pack overheat
c. Engine start sequence
d. Engine FIRE push button on the related side pressed
e. DITCHING push button is selected
What does an amber FAULT light in the HOT AIR push button indicate?
Duct overheat - the Hot Air and Trim Air valves close automatically
How many Air Conditioning System Controllers are there?
- Each Air Conditioning System Controller has 2 lanes – (Active/Standby)
Describe how the Air Conditioning System Controllers regulate temperature?
a. Basic temperature regulation: Both packs produce the required outlet temperature determined by the lowest demanded zone temperature.
b. Optimized temperature regulation: Hot air is added to the individual zones by the trim air valves to maintain the desired zone temperatures.
What occurs when an active lane of an Air Conditioning System Controller fails?
The second lane takes over
What occurs when both lanes of an Air Conditioning System Controller fails?
The related pack is lost. The hot air pressure regulating valve and associated trim air valve(s) close.
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?
a. Takeoff: Ram air inlet flap closes when takeoff power is set and the main landing gear struts are compressed. Ram air inlet flap reopens after main landing gear strut extension.
b. Landing: Ram air inlet flap closes as soon as the main landing gear struts are compressed and speed ≥ 70 knots. Ram air inlet flap opens 20 seconds after speed
If an air cycle machine (ACM) fails, what occurs?
The affected pack will operate as a heat exchanger
What effect will the engine start sequence have on the pack flow control valves?
The pack flow control valve will close automatically
After engine start with the APU BLEED push button ON, what source is supplying bleed air to the packs?
APU Bleed
When does the Lav/Galley Extract Fan operate?
Continuously when electrical power is available
