30 Questions
What is the limitation for opening the RAM AIR inlet?
High altitude
If Hot Air Press Reg. valve fails in closed condition, what happens and what are you supposed to do, if in flight?
Decreased pressurization, descend to a safe altitude
If cockpit trims air valve has failed in open position, which of the warnings will be generated?
Trim air fault indication
What happens when a temperature selector rotary knob is adjusted in the cockpit?
Changes the cabin temperature
What is ACSC and what does it do?
Air Conditioning Source Control, regulates air supply to different zones
What are the conditions under which the ram air inlet flaps automatically close regardless of heat exchanger requirements?
During high altitude flights and heavy rain
How many modes of pressurization exist on the A320?
Two
If the pilot suspects that the selected controller is malfunctioning, how can he change the controller {CPC}, while operating pressurization in AUTO?
By pushing the AUTO/MAN push button
What ECAM Caution will be generated if one cabin pressure controller fails?
CAB PRESS CONTROLLER (FAIL)
If Cabin Pressurization is in Auto, and if you have to push open Emer. RAM AIR, what happens to the Out Flow Valve?
It opens fully
What happens to the outflow valve if the MODE SEL switch is in MAN?
It closes completely
What is the role of Safety Valves in the pressurization system?
To control the air flow into and out of the cabin
With the LDG ELEV selector in AUTO, which reference altitude is used for landing field pressurization?
Field Elevation
What do you understand by negative differential pressure in the context of pressurization?
Insufficient pressure difference between inside and outside the cabin
What happens when you press both Blower & Extract P/B to OVRD in the ventilation system?
The ventilation system switches to emergency mode
Where is the conditioned air distributed to in the air conditioning system?
Cockpit, cargo bays and cabin
What happens when the hot air fault light illuminates on the air conditioning panel?
The hot air press. reg. valve closes and the trim air valves open.
What type of air does the trim air provide to the air conditioning system?
Cold air
In case of zone controller primary and secondary channel failure, what temperatures are maintained by pack one and pack two?
Pack one maintains cold temperature, pack two maintains warm temperature
What happens when the MODE SEL switch is in MAN for the outflow valve?
Outflow valve remains at current position
What is the role of the Safety Valves in the pressurization system?
To release excessive pressure from the aircraft
In the avionics ventilation system, how is the temperature of the cooling air controlled?
Extracting air overboard
When enabling Ram air to the mixture unit, when should the Ram air switch be used?
When pressure is greater than 1 psi differential
In the event of a primary channel failure in the pack controller, what happens?
The secondary computer operates as a backup mode and regulation is not optimized
What is the effect of a secondary channel failure in the pack controller?
Pack is lost
What occurs if both the primary and secondary channels fail in the pack controller?
The packs deliver a fixed temperature of 20 deg C
What happens if the hot air pressure reg. valve fails open?
The temperature stays at the value selected
When bleed air is supplied from the APU, what automatically selected pack flow occurs?
Normal
How does each trim air valve optimize the temperature?
Adding re-circulated air
What type of valve is the pack flow control valve?
Electrically operated and pneumatically controlled
Study Notes
Limitations and Failures
- The RAM AIR inlet has a limitation for opening.
- If the Hot Air Press Reg.valve fails in a closed condition, the cabin will not be pressurized, and the pilots should switch to the other valve to maintain pressurization.
- If the cockpit trims air valve has failed in an open position, the "TRIM AIR" warning will be generated.
Temperature Control
- Adjusting the temperature selector rotary knob in the cockpit changes the temperature in the cabin.
- ACSC (Air Conditioning System Controller) controls the temperature in the cabin.
Pressurization Modes
- There are three modes of pressurization on the A320: AUTO, SEMI-AUTO, and MAN.
- If the pilot suspects that the selected controller is malfunctioning, they can change the controller (CPC) while operating pressurization in AUTO by switching to the other controller.
ECAM Cautions
- If one cabin pressure controller fails, an ECAM Caution will be generated.
Pressurization Operation
- If Cabin Pressurization is in AUTO and the Emer.RAM AIR is pushed open, the Out Flow Valve will close.
- If the MODE SEL switch is in MAN, the Out Flow Valve will be controlled manually.
- Safety Valves prevent over-pressurization in the cabin.
Landing Field Pressurization
- With the LDG ELEV selector in AUTO, the landing field pressurization uses the runway elevation as the reference altitude.
Negative Differential Pressure
- Negative differential pressure occurs when the cabin pressure is lower than the outside air pressure.
Ventilation System
- Pressing both Blower & Extract P/B to OVRD in the ventilation system allows the pilots to override the automatic blower and extract system.
- Conditioned air is distributed to the cockpit, cabin, and avionics bays in the air conditioning system.
- The trim air provides cool air to the air conditioning system.
Pack Controller Failure
- In case of zone controller primary and secondary channel failure, Pack one and Pack two will maintain a temperature of 18°C and 20°C, respectively.
- If the primary channel fails in the pack controller, the secondary channel will take over.
- If the secondary channel fails in the pack controller, the pack will default to a fixed temperature.
- If both the primary and secondary channels fail in the pack controller, the pack will default to a fixed temperature.
Ram Air and Mixture Unit
- When enabling Ram air to the mixture unit, the Ram air switch should be used when the aircraft is on the ground and the engines are not running.
Pack Flow Control
- The pack flow control valve is a proportional valve that regulates the flow of air to the pack.
- When bleed air is supplied from the APU, the Pack one flow is automatically selected.
- Each trim air valve optimizes the temperature by controlling the air flow.
- If the hot air pressure reg.valve fails open, the hot air pressure will increase, and the valve should be closed to prevent overheating.
Test your knowledge of A320 aircon and pressurization systems with these technical questions. Learn about the Pack Flow Control Valve, RAM AIR P/B, and limitations for opening the RAM AIR inlet.
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