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Hmmm, so the A320 has no manual temp control?

Mark Rogers wrote:

> "HECTOP" wrote in message
> news:NFAk6.192973$P82.23631013@news1.rdc1.ct.home.com...
> > In rec.aviation.piloting Mark Rogers wrote:
> > > inoperative lavatory extract fan (the fan that sucks the bad smelling
> air
> > > out of the lav), and if you can figure out why wed refuse an airplane
> for
> > > that, you know the A320 very well!
> >
> > Lemme guess, the forward head shares its ventilation duct with the
> cockpit? :)
>
> No, not quite. :) The sensors for the main cabin temperature are located in
> the ducting between the lavoratory extract fan and the outflow valve. If
> the airplane determines that the lav extract fan has stopped, it knows that
> it is no longer getting airflow over the sensors. It therefore blanks out
> the readings from the sensors, preventing the measurement of the cabin
> temperature. Since the environmental controls work like a thermostat, they
> do not work without knowing what the temperature already is. The aircrafts
> response to this is to set the air conditioning packs to a fixed output
> temperature of 55 degrees F. I dont know why Airbus decided 55F was a good
> temperature; youll have to ask them. This condition was deferrable, since
> the aircraft was certainly safe to fly. But we chose to not subject a 60%
> load of passengers to 5 1/2 hours of 55 degree cabin air, especially a
> morning flight without a lot of blankets. :)
>
> --Mark Rogers

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