A320 Air Cond / Pressurization Questions

Avionics ventilation system indications may be found on which ECAM page(s)?

• Only the BLEED page.
• Only the CAB PRESS page.
• The in-flight ECAM cruise page.
• The in-flight ECAM cruise page and the CAB PRESS pages.

Explanation: Avionics ventilation VENT/INLET/EXTRACT indications are found specifically on the ECAM CAB PRESS page, in the ventilation controls & indicators section — not on the BLEED page or the cruise page.

Air Cond / Pressurization - Ventilation Controls & Indicators

Which statement is correct regarding illumination of the amber AFT ISOL VALVE fault light?

• Automatically closes the aft cargo compartment isolation valves.
• Means that either the inlet or outlet isolation valve(s) disagrees with the switch position.
• Indicates that the extract fan has stopped.
• All of the above.

Explanation: The AFT ISOL VALVE FAULT light, with its ECAM caution, comes on amber when either the inlet or outlet isolation valve disagrees with its selected (switch) position — it doesn't itself close anything or indicate a fan stoppage.

Air Cond / Pressurization - Cargo Controls & Indicators

Pack controller, primary channel failure.

• The secondary computer operates as a backup mode and regulation is not optimized
• The secondary computer takes over (all functions as normal)
• Pack is lost
• Pack outlet temperature is controlled at 15 deg C

Explanation: If a pack controller's primary channel fails, the secondary computer takes over as backup, but regulation is no longer optimized — pack flow is fixed at the previous setting.

Air Cond / Pressurization - System Operation Under Failure Condition

When landing elevation is set to AUTO, the landing elevation is sent to the controller from:

• FMGS.
• FCU.
• ADIRS.
• Captain baro ref.

Explanation: When LDG ELEV is set to AUTO, the pressurization controller uses landing elevation data from the FMGS to build its pressure schedule.

Air Cond / Pressurization - Controls & Indicators (LDG ELEV knob)

How many outflow valves are there?

• One valve with one door
• One valve with two doors.
• Two valves with only one door visible.
• Two valves (one main + one back-up) with only two doors visible.

Explanation: There's a single outflow valve — but its assembly carries both inward- and outward-opening flaps linked to the actuator, giving it one valve with two doors.

Air Cond / Pressurization - Main Components (Outflow Valve)

In flight with pressure controller 1 in use, if it fails:

• You have to use the manual control
• Transfers automatically to controller 2
• You have to select manually controller 2
• You have to set the landing elevation.

Explanation: If pressure controller 1 fails in flight, the system automatically transfers to controller 2 — no manual selection is required, since a transfer also happens automatically whenever the operating system fails.

Air Cond / Pressurization - Pressurization System Operation (Automatic Mode)

In normal flight in closed circuit configuration, the avionics ventilation system controls the temperature of the cooling air by:

• Adding airconditioned air to the flow
• Extracting air overboard
• Adding avionics bay air
• Passing air through a skin heat exchanger

Explanation: In normal flight (closed-circuit configuration), the avionics ventilation system controls cooling-air temperature by passing it through a skin heat exchanger.

Air Cond / Pressurization - Ventilation (Avionics Ventilation)

In case of trim air system fault (zone controller primary channel failure), the secondary channel of the zone

• 14 deg.C
• 24 deg C
• 15 deg.C
• 10 deg.C

Explanation: With the zone controller's primary channel failed, the secondary channel takes over as backup and controls the zones to a fixed 24°C.

Air Cond / Pressurization - System Operation Under Failure Condition