Hot air fault light illuminates on the air conditioning panel;
The hot air press. reg. valve opens and the trim air valves close
The hot air press. reg. valve closes and the trim air valves open
The hot air press. reg. valve closes and the trim air valves close
The hot air press. reg. valve opens and the trim air valves open.
In case of zone controller primary and secondary channel failure, what temperatures are maintained by pack one and pack two
15 deg.c. both.
25 deg.c. both.
20 deg.c. pack 1, 10 deg.c. pack 2.
24 deg.c. pack 1, 15 deg.c. pack 2.
In normal flight in closed circuit configuration, the avionics ventilation system controls the temperature of the cooling air by
Adding air-conditioned air to the flow
Extracting air overboard.
Adding avionics bay air.
Passing air through a skin heat exchanger.
To enable Ram air to the mixer unit, the Ram air switch should be used
At any time
Only when diff. press. is less than 1 psi
When press. is greater than 1 psi. diff
Only after outflow valve is fully opened
Pack controller, primary channel failure
The secondary computer operates as a back up mode and regulation is not optimised
The secondary computer takes over (all functions as normal)
Pack is lost
Pack outlet temp. is controlled at 15 deg.c.
Pack controller, secondary channel failure
No effect on pack regulation back up mode is lost
No effect (all modes still available)
Pack outlet temp. is controlled at 15 deg.c
Pack controller, primary and secondary channel failure
Pack outlet temp. is controlled at 5°C to 30°C in a maximum of 6 minutes by the ant-ice valve
The pack is closed
The packs deliver a fixed temperature of 20 deg.c
Both packs are controlled to 24 deg.c
Hot air press. reg. valve failed open
Optimised regulation is lost
The temperature stays at the value selected when the failure occurred.
No effect
Cabin temperature will be controlled at the upper limit 30 deg.c.
Bleed air supplied from the APU (apu bleed valve open), the pack flow is automatically selected
High
Normal
Low
Econ. flow
Trim air valve, each one optimizes the temperature by
Adding hot air
Adding fresh air
Modulation of pack flow
Adding recirculated air
Hot air pressure regulating valve
Regulates the pressure of hot air tapped upstream of the packs
Is spring loaded open in the absence of air
Opens automatically in case of duct overheat
Opens automatically if the cockpit trim air valve fails
Pack flow control valve
Is pneumatically operated and electrically controlled
Electrically operated and pneumatically controlled
Opens automatically during engine starting
Is spring loaded to open
The temperature selectors are located in
The cockpit
The Cabin
The avionics bay
Only on the CIDS panel at the fwd. attendant station
Pack flow may be selected from
The cabin
Only the CIDS panel at the fwd. attendant station
Engine pressure demand, when the cooling demand in one zone cannot be satisfied, if bleed pressure is low
The minimum idle must be increased manually
The minimum idle is increased automatically
In any case, flight idle is sufficient
The APU must be used to supply additional air
What is the Norm. Max. cabin altitude
8,000 ft.
9,550 +/- 350 ft.
14,000 ft.
800 ft.
What is the Max. negative Diff. pressure for the cabin
0 psi
-1 psi
-2 psi
-8.6 psi
Is it permissible to use simultaneously packs and Lp ground unit during long stops in a hot airfield
Yes
No
Yes, if external temperature is greater than 50 deg.c.
Yes, provided the airflow supplied by the ground cart is less than 1.2 kg/s.
Trim air valves are modulated by
The zone controller
Anti-ice valve
The pack controller
The mixing unit is connected to
Packs, Cabin air, emergency ram air inlet and Lp ground connector
Packs, emergency ram air inlet and Lp ground connector.
Packs and cabin air
Pack 1 and pack 2 only
Once set to ‘ON’ the air conditioning packs operate
Automatically and independently of each other
Normally, but the output of one affects the other
Automatically, pack one as a master, pack two as a slave
Automatically, pack two as a master, pack one as a slave.
Emergency ram air inlet, when set to ‘ON’ the ram air valve will open and supply airflow
In any case
Diff. press. < 1 psi. and ditching not selected
Provided ditching is not selected
Provided ditching is selected.
Zone controller fault (primary channel failure)
Cabin zone at fixed temp
Packs at fixed temp
Secondary channel operates as back up and operation is as normal
The packs deliver a fixed temperature, 20 deg.c. pack 1 and 10 deg.c.pack 2
Conditioned air is distributed to
Cockpit, cargo bays and cabin
Cockpit, fwd. and aft. cabins
Cockpit, avionics bay and cabin
Cockpit, cabin and holds 1 & 2 only
The cabin zone temperature sensors are ventilated by
Air extracted by the lavatory and galley fans
Air extracted from the avionics bay
Temperature sensors are ventilated by ram air
Temperature sensors are ventilated by discharge air to the outflow valve
Temperature control is automatic and is regulated by
Zone controllers only
Pack 1 and 2 controllers only
Both the zone and pack 1 & 2 controllers
The pack flow control valves only
If a pack controller fails, (primary and secondary channel failure), the pack outlet air temperature is controlled by
Ram Air Valve
Hot Air Pressure Regulating Valve
Anti Ice Valve
Trim air valve
The Zone Controller optimizes temperature by action on
Pack anti ice valve
Trim Air valve
Pack Flow control valve
Hot air pressure regulating valve.
When the pack flow control knob is positioned to HI, airflow is
80 % of normal
150 % of normal
120 % of normal
102 % of normal
When using APU bleed to supply the packs, with the pack flow selector at Lo, the pack airflow is
120% of normal
102% of normal
The pack flow control valve closes automatically in case of
A) Pack overheat, engine starting, or operation of the fire or ditching push button
B) Bleed valve failure, pack outlet pressure increase
Both (a) and (b)
Trim air valve failure
In case of trim air system fault (zone controller primary channel failure),the secondary channel of the zone controller regulates the zone temperature at
14 deg.c
24 deg.c
15 deg.c
10 deg.c.
In case of total zone controller failure
Hot air and trim air valves open and packs deliver air at a fixed temperature; 15 deg.c. pack 1 , 10 deg.c.pack 2
Hot air and trim air valves close and packs deliver air at a fixed temperature; 15 deg.c. pack 1, 10 deg.c.pack 2
Hot air and trim air valves close and packs deliver air at a fixed temperature; 20 deg.c. pack 1 , 10 deg.c. pack 2
Hot air and trim air valves open and packs deliver air at a fixed temperature; 20 deg.c. pack 1 , 10 deg.c. pack 2.
During landing run ram air inlet flaps open when speed is less than
77 kts. (after 30 sec. delay)
70 kts. (after 3 mins )
70 kts. (after 20 sec. delay).
140 kts. (after 20 sec. delay).
When the APU is supplying the packs, the pack controller sends a demand signal to increase airflow when a zone temperature cannot be satisfied;
To the pack ram air inlet flap
To the APU ECB
To the pack flow control valve
To the engine interface units EIUs.
The ditching switch when selected
The outflow valve closes when in MAN mode
Ram air inlet and ventilation extract valves open
The emergency ram air inlet opens
Outflow valve, ram air inlet & ventilation extract valves, & the pack flow control valves close
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
In normal operation, pressurisation is
Fully automatic
Manually controlled
Automatic, but landing elevation must be manually set
Remaining automatic only when CPC 1 is in use
The outflow valve is powered by
One of two electric motors
One of three electric motors
Three mechanically linked electric motors
One of three pneumatic actuators
During ground function operation, the outflow valve is
Fully open
Fully closed
Positioned according to FMGS demands
Operating in abort mode
To see the position of the outflow valve, it is necessary to call ECAM ;
Cond. page
Bleed page
Press. page
Vent page
Two identical, independent, automatic digital pressurisation controllers are used for system control
One controller active, one in standby
Both controllers monitored by FMGC
No controller for climb phase and No. 2 controller in cruise and descent
No. 1 controller for climb and No. 2 for descent.
Which controller position generates excess cabin altitude and pressure signals for ECAM indication in manual mode
Both
No. 1
No. 2
Neither
When ram air Pb set to ON, (& ditching not selected), the outflow valve will open when
Diff. press. >1.5 psi
Diff. press. < 3 psi
Diff. press. < 1 psi
Diff. press. > 1 psi.
The purpose of the safety valves is to avoid
Opening cabin doors whilst still pressurised
Rain entering avionics bay
Excessive positive pressure differential, and excessive negative differential
Landing with the aircraft pressurised
The safety valves are operated
Electrically
Hydraulically
Pneumatically
By the FMGC
When landing elevation is set to auto, the landing elevation is sent to the controller from
FMGS
FCU
ADIRS
F/O baro ref.
When mode sel. is set to manual, the outflow valve is controlled by signals sent via controller 1 or 2
True
False
Controllers 1 and 2
Only controller 2
On ECAM Cab press. page, the outflow valve indicator changes to amber if
It is fully closed
It is fully open in flight
It is fully open on the ground
It is not fully open on the ground.
On ECAM Cab. press. page, the safety valve indication changes to amber if:
Both safety valves are fully open
One safety valve is open
Both safety valves are fully closed
Both safety valves do not open
On ECAM cab. press. page, the cabin altitude indication changes to red when cabin altitude is
> 14,000 ft
> 8,500 ft
> 9,550 ft
> 8,800 ft
Following a system 1 fault
Master caution is activated and the crew must take ECAM actions
System 2 must be selected by the crew
System 2 takes over automatically without any crew action
The crew must manually operate the system.
Cabin pressurisation starts at
Engine start
Take off power selection. (prepressurisation)
Lift off
Selection of climb power
The pressure safety valve opens at
8.06 psi
8.6 psi
9.0 psi
7.6 psi
In fully automatic mode, cabin pressurisation is optimised by using information from
FMGC, landing field elevation & destination QNH, ADIRS static press. baro. correction and EIU thrust lever angle info.
Actual cruise level and selected landing elevation
Selected cabin altitude
Selected landing elevation
