A320 Primary&Secondary pack controller fault- question

[positionbusbo]

Dear All

In some Airbus 320 aircrafts, the FCOM states "Primary and Secondary Channel Failure
As a backup corresponding pack outlet temp is controlled by the anti-ice valve and is stabilized to a temp between 5C and 30C in a maximum of 6 minutes."



What do they mean by -- Pack outlet temperature is controlled by the anti ice valve, what does anti ice have to do with controlling pack outlet temperature.. Confused, pls help

Regards
BusBO

[Goldenrivett]

Hi positionbusbo,

what does anti ice have to do with controlling pack outlet temperature..

Have a look at the diagram DSC-21-10-20 Pack Schematic (simplified) and note there is an aniti-ice valve in the system. (nothing to do with engine or wing anti-ice)

If the Pack outlet temperature is below 0 degrees C, then there is a danger of ice build up in the ducting etc. To ensure the temperature is above 0C, an anti-ice valve is fitted which can introduce hot bleed air just downstream of the pack turbine.

[positionbusbo]

Thank You. :)