Originally Posted by
owl-attack
Here is where my real confusion is:
STANDBY PACK AVERAGE TEMPERATURE
If all zone controls and primary pack controls fail, the standby pack controls command the packs to produce air temperature which will satisfy the average temperature demand of the two cabin zones. The trim air modulating valves will close. The flight deck zone temperature selectors will have no effect on the standby pack controls
Can somebody explain this above para to me in simple terms.
So in this above scenario there is no temperature control for the flight deck, why so? why can't the packs go to Independent mode of operation in this above scenario, Had it been designed to go to independent pack operation (where the left pack takes care of the flight deck temperature and the right pack produces temperature to satisfy the average of two cabin zones.)that would make more sense right, that way even the flight deck will have some temperature control
What am i missing
Thank you guys
Think about it - if
all controls fail then the pack cannot compute a desired temperature. Lets say that the flt deck temp sensors failed so that they went to max hot (or cold) - the crew have no control, in that scenario is it safer simply to average the temp demands of both zones and therefore provide a working environment that is safe rather than comfortable.