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WorksheetsATR 72-600 (Air Conditioning and Pressurization)
Total questions: 45
Worksheet time: 23mins
During engine start:
The extract fan stops during 120 seconds, and the EXHAUST MODE pushbutton FAULT light illuminates.
Extract fan stops during 60 seconds, and the EXHAUST MODE pushbutton FAULT light does not illuminate.
The extract fan stops during 10 seconds.
How high above take off elevation can the aircraft be operated without canceling the automatic return feature?
any altitude 3,500 feet above the landing field elevation
2,500 feet on QNE (1013)
any altitude less than 3,500 feet above the departure field elevation
The functions of the pack valve are:
shut off and pressure control
shut off, pressure control, and temperature control
pressure control only
The pneumatic outflow valve:
is slaved to the electro-pneumatic outflow valve in the automatic mode only
operates in the manual mode only
is always slaved to the electro-pneumatic outflow valve
The temperature control valve is:
The valve is controlled in the automatic mode by the electronic temperature controller. In the manual mode, it is controlled by the compartment temperature selector knob.
The valve is controlled in the automatic mode by the RECIRC FAN pushbutton. In the manual mode, it is controlled by the electronic temperature controller.
The valve is controlled in the automatic mode by the pneumatic temperature controller. In the manual mode, it is controlled by the compartment temperature selector knob.
During normal operations with no failures, the pressurization controller uses as reference the aircraft static air pressure generated by:
ADC 1 and the Captain's altimeter BARO setting
ADC 2 and the Captain's altimeter BARO setting
ADC 1 and 1013 hPa
ADC 2 and 1013 hPa
The compartment temperature selector knob is operative:
in the automatic mode only
in the automatic and manual modes
in the manual mode only
Which pack is the primary supplier of cockpit air?
the left pack
The left and right packs supply the cockpit in equal proportions.
the right pack
If the automatic pressurization mode is desired, what should be the position of the CAB ALT knob?
6 o'clock position
AUTO
NORM
12 o'clock position
Assuming that the associated pack valve is not closed, the ground cooling fan is running:
on the ground only
on the ground or in flight, if the flaps are extended
1) in flight if the airspeed is less than 150 knots AND the landing gear has been retracted for less than 10 minutes, or 2) on the ground, or in flight when the airspeed is less than 150 knots AND the landing gear is extended
In the event you need to return to the departure airport after take off, the pressurization controller will instead use the ________ minus 300 feet as the target cabin altitude for landing.
departure airfield elevation
landing field elevation
theoretical cabin altitude
The DUMP function is available regardless of the mode of operation of the pressurization system:
True
False
only above 18,000 feet
Where are the air conditioning packs located?
There is one pack in each main gear fairing.
Both packs are located in the right landing gear fairing.
Both packs are located in the left landing gear fairing.
In case of a pack overheat downstream of the compressor:
The pack valve on the faulty side closes.
Neither of the pack valves close.
Both pack valves close.
What are the positions of the overboard and under floor valves when the aircraft is in flight with the OVBD VALVE selector switch in the AUTO position?
OVBD fully open; UNDER FLOOR fully closed.
OVBD fully closed; UNDER FLOOR fully open.
OVBD fully closed; UNDER FLOOR fully closed.
OVBD fully open; UNDER FLOOR fully open.
What happens when the FLOW pushbutton is pressed in with HIGH illuminated?
The recirculation fans start.
Both pack valves will deliver 30 psi into the packs.
The recirculation fans increase speed.
If a pack valve is closed or inoperative:
the other pack supplies both compartments via the crossfeed valve
the other pack supplies both compartments through the mixing chamber
hot air is still available from that pack via the temp control valve
What is the maximum cabin differential pressure?
8.25 psi
5.85 psi
8.0 psi
6.35 psi
What is the maximum cabin altitude at FL250 with the differential pressure 6 psi?
10,000 feet
5,540 feet
7,640 feet
6,740 feet
Temperature control is achieved by mixing bleed air with air produced by the expansion turbine.
True
The compartment and duct temperatures of the selected side.
False
The recirculation fans:
recirculate a part of the cabin air, in order to reduce the load on the packs
increase the pack valve airflow
improve cooling of the heat exchangers when the aircraft is on the ground
Placing a PACK VALVE pushbutton to the on position will...
cause the associated pack valve to open, provided electrical power and pneumatic pressure are available
cause the associated pack to open, provided electrical power is available
cause the associated pack to open, provided pneumatic pressure power is available
cause the associated pack valve to open immediately
What is the highest cabin rate of descent available with the DESCENT RATE pushbutton released out, normal position?
-400 feet per minute
-500 feet per minute
-550 feet per minute
How many outflow valves are there?
two pneumatic outflow valves.
two electro-pneumatic outflow valves
one electro-pneumatic valve
two: one electro-pneumatic valve, and one pneumatic outflow valve.
How is the system protected against exceeding the maximum cabin differential pressure?
Both outflow valves will open in order to prevent an overpressure condition.
Both outflow valves will close in order to prevent an overpressure condition.
Only the electro-pneumatic valve will open to prevent an overpressure condition.
What is the air conditioning regulator pressure when high flow (HIGH) is selected (controlled by the PACK VALVE)?
60 psi
50 psi
40 psi
30 psi
When do the ground turbo fans provide air cooling?
When IAS 150 kts and landing gear is retracted for more than 10 minutes
Always in flight
When IAS 150 kts and landing gear is retracted for less than 10 minutes
Only on the ground, never in flight
At which Cabin Altitude is the EXCESS CAB ALT warning triggered?
10,000 ft
9,000 ft
11,000 ft
13,000 ft
What is the air conditioning normal (NORM) regulator pressure (controlled by the PACK VALVE)?
12 psi
22 psi
42 psi
32 psi
What should be entered in the Landing Elevation on the Auto Press Panel before each flight?
Landing airport field elevation
Landing airport pressure altitude
Departure airport field elevation
Landing airport field elevation minus 300 ft
In which pressurization mode is the DITCH function available?
There is no DITCH function.
Automatic mode only
Manual mode only
In both automatic and manual modes
What is the relationship between the OVBD VALVE and the Under Floor (U/F) VALVE?
If the OVBD VALVE is closed, the U/F VALVE is open.
If the OVBD VALVE is partially open, the U/F VALVE is closed.
All answers are correct.
If the OVBD VALVE is fully open, the U/F VALVE is closed.
What will happen if the EXHAUST MODE pb is pushed on the ground with engine 1 not running?
OVBD valve will be fully open and U/F valve will be closed.
OVBD valve and U/F valve will be fully closed.
OVBD valve will be fully closed and U/F valve will be open.
OVBD valve and U/F valve will be fully open.
At what height above the departure field elevation is the pressurization system automatic return feature cancelled?
2,500 ft
1,500 ft
3,500 ft
5,000 ft
At which temperature downstream of the pack compressor does the PACK VALVE automatically close?
Above 100° C
Above 254° C
Above 150° C
Above 204° C
Where are the Air Conditioning Packs located?
Both in the Left Main Landing Gear Fairing
In the AFT Compartment
Both in the Right Main Landing Gear Fairing
One Pack in each Main Landing Gear Fairing
Which air conditioning pack primarily supplies the flight compartment (cockpit)?
Recirculation fans and excess air from the Right Pack
Left Pack
Right Pack via the Under Floor (U/F) valve
Right Pack
Which caution is displayed if duct temperature goes above 92° C?
FAULT on the overhead panel and DUCT FAULT on the EWD
FAULT on the overhead panel and OVER TEMP on the EWD
OVHT on the overhead panel and DUCT TEMP HI on the EWD
OVHT on the overhead panel and AIR DUCT OVHT on the EWD
How is the toilet ventilated?
By a lavatory extractor fan
Manually, by opening the toilet vent valve
The toilet is not ventilated
By differential pressure through a vent line
What is the correct sequence for changing the pressurization mode from Automatic to Manual?
Set MAN RATE knob to Max Decrease, then push CAB PRESS MODE push-button to select MAN mode
Push CAB PRESS MODE Selector push-button to select MAN
Set MAN RATE knob to 9 o'clock position (MAN), then push CAB PRESS MODE Selector push-button to select MAN mode
Set MAN RATE knob to Max Increase, then push CAB PRESS MODE push-button to select MAN mode
To what negative differential pressure is the cabin limited to?
-0.8 psi
-1.0 psi
-1.5 psi
-0.5 psi
What is the maximum cabin rate of climb in AUTO mode?
+350 ft/min
+550 ft/min
+600 ft/min
+400 ft/min
What are the functions of the PACK VALVE?
Pressure control only
Shut off, pressure, and temperature control
Shut off and pressure control
Temperature and pressure control
When should the EXTRACT AIR FLOW VALVE be closed using the lever in the cockpit?
In case of failure of the OVBD VALVE
In case of smoke in the forward compartment
In case of cold temperatures in the cockpit
In case of AFT smoke
In which air conditioning mode (TEMP SEL) is the compartment temperature selector knob operative?
Automatic mode only
Manual mode only
In automatic and manual modes
The left selector knob operates in automatic mode and the right in manual mode
