Air cond/Press/Ventilation Flashcards
Which valves will receive a close command when the DITCHING PB is depressed?
Avionics Inlet and Extract Valves
Ram Air inlet
Pack flow control valve
Outflow valve (if in auto)
FWD cargo outlet isolation valve
Will the DITCHING PB always close the outflow valve?
Not if its in manual mode
Can the pilot control the outflow valve?
Yes, select MAN on the MODE SEL and use the MAN V/S CTL switch
How many auto controllers are in the pressurization system?
- Only 1 is used at a time and they switch after each landing
How do you manually switch controllers?
Switch MODE SEL to MAN for 10 seconds and then back to AUTO
What does an amber FAULT light in the MODE SEL pb indicate?
Both pressure controllers are faulty
From what source does the pressurization system normally obtain landing elevation?
FMGC database
If the FMGC database does not supply the landing elevation, how do you set it?
Manually by selecting the landing elevation via the LDG ELEV knob
What protects the airframe from excessive cabin differential pressure?
2 Pressure relief valves (safety valves)
How many outflow valve motors are installed?
3
1 for each CPC and 1 for manual control
How would a pilot manually control the pressurization?
By selecting MAN on the MODE SEL pb and utilizing the MAN V/S CTL toggle switch
What flow rate is automatically selected when the APU bleed air is in use or single pack operation?
HI
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 or PACK 2 PB?
Overheat- Pack outlet
Overheat- Compressor outlet
Discontinuity- Switch position disagreement with pack flow control valve
(NOTE: FAULT light will be illuminated when no bleed air is supplied)
At what cabin differential pressure does the RAM AIR valve open?
1 PSI or less
What causes the Pack Flow Control Valve to automatically close?
Upstream pressure below min
Pack overheat
Engine start sequence
Engine FIRE PB on the related side is pressed
DITCHING PB is selected
What does an amber fault light in the HOT AIR PB indicate?
Duct Overheat
(The Hot air and Trim Air Valves close automatically)
How many Air Conditioning System controllers (ACSC) are there and how many lanes do they have?
2 Air Conditioning System controllers
Each controller has 2 lanes (Active and Standby)
How do the Air Conditioning System Controllers regulate temperature?
Both packs produce the required outlet temp determined by the lowest demanded zone temp
Hot air is added to the individual zones by the trim air valves to maintain the desired zone temp
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 fail?
The related pack is lost. The hot air and trim air valves close.
How does the air conditioning system controller configure its associated pack ram air inlet flap for take off and landing to avoid the ingestion of foreign matter?
Takeoff: Pack ram air inlet flap closes when takeoff power is set AND the main landing gear struts are compressed. It reopens after the main landing gear strut extension
Landing: Pack ram air inlet flap opens as soon as the main landing gear struts are compressed and speed is less than 70kts. Opens 20 seconds after speed is greater than 70kts.
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 controls valves will close automatically
What does the CARGO HEAT HOT AIR amber FAULT light indicate?
Duct Overheat
What is the purpose of the CABIN FANS?
To re-circulate cabin air to the mixing chamber and back to the cabin
With the BLOWER and EXTRACT pbs in AUTO, how does the system operate?
Ground- System is OPEN
Flight- System is CLOSED
Intermediate- CLOSED config except the small internal flap in the extract valve is OPEN
With the BLOWER and EXTRACT pbs in OVRD (smoke config), what are the positions of the INLET and EXTRACT valves?
INLET is CLOSED
EXTRACT is OPEN
What is the status of the Blower and Extract fans with the Blower and Extract valves in OVRD?
Blower fan is OFF
Extract fan is ON
When is air conditioning introduced into the avionics compartment?
Abnormal Operation
Smoke Configuration
Is the skin heat exchanger ever bypassed in flight?
Yes during smoke config
What does an amber FAULT light on the BLOWER pb indicate?
SMOKE warning activated
Computer power supply failure
Low Blower pressure
Duct overheat
What does an amber FAULT light on the EXTRACT pb indicate?
SMOKE warning activated
Computer power supply failure
Low extract pressure
With 2 FAULT lights on the VENTILATION panel, are there any other indications?
Yes- SMOKE light in the GEN 1 LINE PB
