A320 ATA 21 Air Cond. Flashcards
During descent the controller mantains a cabin rate to equal cabin pressure to landing field pressure with a maximum descent rate of?
750ft/min
“Hot air fault” light illuminates on the air conditioning panel
The hot air pressure regulator valve closes and the trim air valve closes automatically
In normal flight, the avionics ventilation system controls the temperature of the cooling air by?
Passing air through a skin heat exchanger
Temperature regulation is automatic and controlled by?
One zone controller and two packs controller (MSN 2472 older)
Two ACSC (Air conditioning system controllers) MSN 2736 New
Optimized temperature regulation
The system optimizes the temperature acting on the trim air valves
The Packs Ram air inlet flaps close during T/O and LDG to avoid ingestion of foreing matter
True or False?
True in ALL FLEET
THE EMERGENCY RAM AIR PUSHBUTTON IS ON.
-RAM AIR VALVE opens ONLY if ditching is selected.
-OUTFLOW VALVE opens about 50% only if it is under manual control
- We always have EMERGENCY RAM AIR flowing to the mixer unit regardless of diff. pressure.
Which are True or False?
All are false
“HOT AIR” pressure regulator valve failed open. Is there any effect?
No effect
BLEED AIR supplied from the APU (APU BLEED VALVE OPEN), The pack flow is automatically selected in which mode?
High, normal, low…?
High
TRIM AIR valve adjust temperature by?
-Adding hot air
-Adding cold fresh air
-Modulating the pack flow control valve
-Mixing recirculated cabin air
Adding HOT AIR
The “HOT AIR” pressure regulating valve:
Regulates the pressure of hot air tapped upstream of the packs
PACK FLOW CONTROL VALVE its —– operated and —— controlled
Pneumatically operated
Electrically controlled
The zone temperature selectors are located in?
Cockpit in the overhead panel
Engine bleed press. demand, when the cooling demand in one zone cannot be satisfied, what happens with the idle?
Minimum idle is increased automatically
TRIM AIR valves are controlled by?
Zone controller or the ACSC on MSN higher than 2736
The MIXER UNIT is connected to?
Packs, recirculated cabin air, emergency ram air inlet and LP ground inlets
Should the ECAM display “AIR COND CTL 1(2) - A (B) FAULT in models MSN’ higher than 2736?
What does it mean?
Lane A(B) of ACSC 1(2) fails.
Should the ECAM display on ground “VENT AVNCS SYS FAULT”
Flight Crew should perform the ECAM actions and, previous to the STATUS review, refer to QRH to perform the AEVC System Reset
The PACK FLOW control valce closes AUTOMATICALLY in case of:
Pack overheat in ground, engine start or operation of the fire or ditching push button.
If pack controller fails (PRIMARY AND SECONDARY CHANNEL), the OUTLET PACK temperature is pneumatically regulated at what temperature?
Between 5ºC and 30ºC in a max. of 6 min.
What statements about the Air Conditioning System Controllers (ACSC) are correct?
-ACSC 1 regulates cockpit temp, ACSC 2 regulates the temp. of the 2 cabin zones
-Each ACSC has 2 lanes.
-1 Lane failure of 1 ACSC has no effect.
All are CORRECT
APU BLEED AIR, the zone controller or the ACSC sends a demand signal to increase the APU flow when a zone temperature cannot be satisfied. Where is this signal sent to?
APU ECB (electronic control box)
The DITCHING switch when selected sends a closure signal to?
-Outflow valve
-Emergency RAM air inlet, the avionics inlet and extract valves
-Pack flow control valves.
ALL CORRECT
In flight, if cabin pressure controller CPC n.1 fails?
It transfers auto to CPC n.2
The OUTFLOW valve is powered by?
Either of the THREE electric motors
Airplane on ground after landing for more than 55s, the outflow valve is in what position?
Fully open
When the RAM AIR pb is ON, if it is under automatic control the system will drive the outflow about 50% open if diff. pressure is below —PSI.
Below 1 PSI
The function of the safety valves is to avoid?
Cabin pressure going too high 8.6PSI or going too low 1 PSI
When LDG elevation is AUTO, the system uses FMGC data to construct and optimez a Pressure schedule. True or False?
True
On ECAM CABIN PRESS page, the OUTFLOW indicatior changes to AMBER if?
The valve opens more than 95% during flight
On ECAM CABIN PRESS page, the SAFETY valves indicator changes to AMBER if
At leas one safety valve is OPEN.
When does AUTO pressurization start?
During T/O roll
An Automatic transfer between the 2 CPC’s occur when?
-70 sec after LDG
-If the operating system fails.
-Moving the LDG elevation knob out of the AUTO position.
First two statements are correct
Avionics compartments smoke detector is located?
In the ventilation extract overboard DUCT.
When both the blower and extract pb are set to the override position, ventilation air is supplied by?
Air conditioning system via the Air Cond Inlet Valve
In NORMAL operation, what is the MAX cabin altitude.
8000ft
MAX. negative diff. cabin pressure is?
-1PSI
On MSN higher than 2472, which unit DEPRESSURIZES the A/C in case of ABNORMAL residual pressure on ground?
The RCPU
MAX. positive differential cabin pressure is
9PSI
When the guarded “RAM AIR” pb is set to ON?
If cabin diff. pressure is less than 1PSI: The outflow valve opens to about 50% when under AUTO control. It does not open when under manual control. EMER RAM air flows directly to the mixer unit.
The reference temp set by pilots can be fine tuned for each cabin zone through the temperature control panel installed in FAP. True or False?
Only for A/C with ACSC
In case of EMERGENCY DESCENT?
-Disconnect A/P and A/THR
-Use of A/P is highly recommended.
-Immediately extend speedbrakes.
-Select TCAS mode on TA
Use A/P is recommended.
Should the 2 lanes of ACSC fail in models with MSN higher than 2736
The related pack is lost, hot air pressure-regulating valve and associated trim air valves closes.
