Term
| Cabin Press Master Warning indicates what? |
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Definition
Cabin Altitude above 10,000ft
Diff pressure 7.5 psi |
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Term
| How is each Pack protected from against overtemperature? |
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Definition
Two overtemperature switches, one is located in the compressor outlet duct abd closes if the temp exeeds
225°C. The other switch is located in the pack outlet duct and closes if the temp exceeds 82°C |
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Term
| What indications would you get if an overtemperature occurs? |
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Definition
| The respective bleed valve would close and the DUCT OV TEMP light in the AIR COND panel will come on together with AIR COND master caution. |
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Term
| How is the cabin/cockpit temperature controlled? |
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Definition
| The temperature of the outgoing air is either automatically or manually controlled from the cockpit. The actual temperature regulation is performed by mixing hot bleed air directly from the pneumatic system with air that has been cooled by the main unit of the pack. |
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Term
| How Much of the total outflow goes to the cockpit? |
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Definition
| The required supply to the cockpit is limited to 1/3 of the available flow from the right pack. |
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Term
| When would you control the cabin temp manually and what precautions would you use? |
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Definition
| Manual temperature mode shall only be used in case of failure in the Auto control system. Extreme care shall be taken not to obtain a temperature below freezing in the distribution duct. |
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Term
| How is the avionics rack ventilated? |
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Definition
| The avionics rack is ventilated by a fan which draws air from the cabin through a filter into the avionics rack and down to the underfloor area and then dumped overboard through the outflow valves. The avionics vent fan operates whenever anyone of the three AVION switches is in the ON position. |
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Term
| If an overtemperature in an air conditioning pack occurs, what lights will illuminate? |
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Definition
| DUCT OV TEMP light in the AIR COND panel will come on together with AIR COND master Caution. |
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Term
| How is the pressurisation controlled in the Manual Mode? |
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Definition
| A rotary knob on the pressure control panel is used to set the pneumatic outflow valve in desired position. Rotating the knob clockwise will increase and counterclockwise will decrease the cabin altitude. The Primary electro pneumatic outflow valve will remain closed. |
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Term
| What are the pressures for the outflow valve positive and negative relief function to operate? |
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Definition
| For relief valve opening, maximum differential pressure is 7.6 psi and maximum negative pressure is -0.5 psi. |
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Term
| In the Auto Mode the duct sensor protects the duct, by keeping duct temp between... |
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Definition
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