01. Packs valves functions are: Air pressure control only. Shut off, pressure control and hence flow control. Shut off, flow control, and temperature control.
02. Packs P/B IN means that: Pack valve is fully closed in all the cases. Pack valve is opened if the opening conditions are met. Pack valve regulates pressure and airflow, on ground only. Pack valve regulates pressure and airflow in flight only.
03. Air conditioning packs are installed: Both in the left landing gear fairing. Both in the right landing gear fairing. One in each landing gear fairing.
04. Wish pack is the primary supplier of cockpit air? Left. Right. There is no priority.
05. If one pack is inoperative: The other one supplies both compartments through the mixing chamber. The other one supplies both compartments through the cross valve. Only ventilation is insured on the affected side by the recirculation fan. Manual mode must be selected ON to recover airflow to the cabin.
06. One pack off: Relevant compt temp can be controlled by the compt temp selector. Relevant compt temp cannot be controlled. Relevant compt temp can be controlled by the compt temp selector only on ground. Relevant compt temp follows the other compt temp.
07. Packs valves are: Electrically operated and electrically controlled. Electrically operated and pneumatically controlled. Pneumatically operated and electrically controlled. Pneumatically operated and pneumatically controlled.
08. Air flow level is controlled: Automatically, according to the bleed air pressure. Manually, by a single NORM/HIGH push button. A+B are correct.
09. The selection of airflow NORM/HIGH from packs is: Automatic, depending of PL position. Automatic, depending of cabin air temperature. Manual in any case.
10. What happens when the pack flow push button is IN, HIGH illuminates? The recirculation fans stop (if the PB are depressed). The recirculation fans continue to run, but at higher speed. Both packs valves are controlled to allow a higher regulated pressure (30 instead of 22 Psi.
11. Provided that the relative pack valves are not closed, the cooling fans are running: Automatically on ground. Automatically, in flight speed bellow 150Kts, and landing gear is retracted for less than 10 minutes. Automatically, in flight speed below 150Kts, and lander gear is extended. A+B+C are correct.
12. The compt temperature selector: When in manual, the TEMP CTL VALVE is directly controlled by the COMP TEMP SELECTOR. When in auto, the TEMP CTL VALVE is controlled by the COMP TEMP SELECTOR through the ELECTRONIC TEMP CONTROLLER. A+B are correct.
13. With the TEMP SEL PUSH BUTTON IN AUTO, the electronic temperature controller computes temperature control valve position taking into account: Zone temperature demand only.( COMP TEMP SELECTOR position) Duct outlet temperature and associated compartment temperature only. Both the above plus A/C skin temperature.
14. The comp temperature selector is operative: In automatic mode. In manual mode. In both cases.
15. Temp selector PB in manual mode: Overheat alarm is inhibited. Overheat alarm is not inhibited. Overheat alarm depends on temperature control selector position.
16. The Comp Temp Indicator displays: Only the compartment temperature of the selected side. The pack and duct temperatures of the selected side. The compartment and duct temperatures of the selected side.
17. The recirculation fans: Are used to improve cooling of heat exchanger on the ground. Are used to increased pack valve airflow when in HIGH MODE. Are used to recirculate a part of the cabin air, to increase fresh air supply.
18. On ground, the air supplied to the air conditioning system may come from: Engines only. Right engine in Hotel mode only. Engines or a ground conditioning unit.
19. Pack valve FAULT means: Actual valve position disagrees with the selected position. Overheat downstream of the compressor (T+204ºC/393ºF) AND PACK VALVE CLOSED. A+B are correct.
20. If a pack valve is closed or inoperative: Hot air is still available from that pack via the TEMP CONTROL VALVE. The other pack supplies both compartments (cockpit, cabin) through the mixing chamber. The other supplies both compartments via GROUND CROSSFEED VALVE.
21. When the bleed valves are selected ON pack valve PB pressed IN: Both pack valves open immediately. Pack 1 valve opens immediately, pack 2 valve opens after 6 sec delay. Both pack valves open after 10s delay.
22. If the related electrical supply (or airflow) is lost, the pack valves: Remain in last position. Are spring-isolated closed. Go in full open position.
23. In case of pack overheat downstream of the compressor: The pack valve on the faulty side closes. Both pack valves closes. No pack valve closes.
24. In case of duct overheat downstream of the mixing chamber: The pack valve on the faulty side closes. Both pack valves close. No pack valve closes.
25. Temp selector OVHT caution is triggered when: Duct temperature exceeds 92ºC. Cabin temperature exceeds 35ºC. Compressor temperature exceeds 2014ºC.
26. What is the meaning of a recirculating fan Fault Light? Fan RPM too low only. Fan motor overheat only. A+B are correct.
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