Air Conditioning and Pressurization Flashcards
In the aircraft pressurization system, what does the Amber LO
^p light indicate?
The pressurization system cannot keep up with descent rate of
aircraft
What would cause the blue RATE light on the overhead
pressurization panel to illuminate?
The cabin pressure rate knob is out of the NORM position
What air conditioning malfunction could cause an amber pack
FAULT light?
A pack overheat or valve position disagreement with selected
switch position
What are the different levels of Air Conditioning Pack flow?
Normal or ECON
In the Air Conditioning System, what is the purpose of the
ECON pushbutton switch?
Reduces airflow inflight to 68% normal flow (both engines
operating) to increase fuel efficiency.
What is the primary purpose of the Pack Valves in the Air
Conditioning system?
They function as both a shutoff valve and a flow control valve
In the Air Conditioning System, what is the purpose of the
MAX COOL pushbutton switch?
Lowers the lower limit of the pack discharge temp
On the overhead air conditioning panel, if the compartment
temp function is selected to CRT, what happens?
All compartment temperatures can be read on ECAM
How many automatic cabin pressurization systems are
installed?
2 systems, one active and one in standby
When does the pressurization system automatically switch
controllers?
At 2nd engine start or when active system fails
In the Pressurization System, how many motors are installed
on each outflow valve?
Three, (Reg 1, Reg 2, manual)
If one auto pressurization controller is deferred and the
remaining one fails, how would the crew control aircraft
pressurization?
Selecting the faulted controller OFF will force the
pressurization system into manual control
In the Air Conditioning System, what is the purpose of the
RAM air?
Used to ventilate cockpit and cabin in case of dual pack failure
In the aircraft pressurization system, what is the purpose of
the Safety valves?
Protect against over or under pressurization of the aircraft
How many temperature zones are there in the Air
Conditioning System?
Four – Cockpit, FWD cabin, MID cabin, Aft cabin
With both Air Conditioning packs operating, what is the pack
outlet temperature control priority?
If the Flt Deck demands coldest temp, it controls pack 1
In the aircraft pressurization system, what automatically
occurs when both outflow valves are selected OFF?
Ditching mode is activated
In the Air Conditioning system, how are the lower FWD and
AFT cargo compartments heated?
Indirectly heated by upper deck air, BULK cargo compartment
is directly heated
When would the Vent Overboard Valve normally be fully
open?
On the ground, no engines running
What occurs if the EXTRACT pushbutton on the VENT
overhead panel is pressed in-flight?
OVBD light illuminates white and Overboard Valve partially
opens, increasing the rate of ventilation
What does the air conditioning system supply to the Bulk
Cargo Compartment?
Trim air plus air extracted from the main deck
What three conditions will cause the residual pressure red
warning light to flash?
Cabin pressure is present, at least one engine is shut down and
the emergency evacuation slide is disarmed
What is the purpose of the RAM air system?
Used to ventilate cockpit and cabin in case of dual pack failure
What occurs if the VENT EXTRACT pushbutton is pressed inflight in response to a VENT EXTRACT LO FLOW ECAM
message?
OVBD illuminates white and the Overboard Valve partially
opens
What is the primary function of the Precooler?
Controls temperature of the engine bleed air entering the
bleed air manifold
Where can hot air for the air-conditioning system be supplied
from?
The engine(s), APU or a ground air cart
When you select the MAN PRESS switch, how does it affect
the aircraft pressurization system?
The system is selected to manual, the V/S Switch becomes
active and the ECAM pressurization display and the Cabin High
Altitude warning are both lost
In the Air Conditioning system, what supplies the air for the
Hot Air Manifold?
Hot compressed bleed air tapped off prior to the packs
Where is the cold air from the Air Conditioning Packs sent?
Cold Air Manifold
With only one Air Conditioning pack operating, what controls
that pack’s outlet temperature?
The operating pack outlet temp is controlled by whichever
zone (cockpit or main deck) that requires the coolest air
In the air conditioning system, what is the function of the
Pack Temp MAN CTL selector?
Manual control of the Pack discharge temperature when MAN
is illuminated white in the Pack MODE SEL pushbutton
During normal operation, what does the active pressurization
system control to maintain cabin pressurization?
Outflow valves
In the Air Conditioning system, what component mixes air
from the Hot and Cold Air manifolds?
Trim Air valve
