During which phase of flight are your ears having a problem with the CRJ? In the climb or descent?
I've noticed problems with ear discomfort in the cabin descent on a CRJ, but none on an EMB-135/145.
On the Canadair, after takeoff the pressurization controller is supposed to maintain departure field pressure until 10 minutes after takeoff, to allow for returns to field, but in practice, the controller pressurizes the cabin aggressively for landing field elevation when the thrust levers pulled back from TO
detent to the CLB detent. It's not a problem when the landing field elevation is higher than takeoff elevation, the cabin remains at departure field elevation. But if the landing elevation is lower than takeoff, the cabin starts pressurizing toward the lower field elevation immediately. As the climb continues, the cabin rate reverses and climbs to where it needs to be for cruise.
I've noticed the transition from takeoff power to climb power as the hardest part of the pressurization schedule in terms of discomfort in the ears. So when the landing elevation is less than departure elevation, I don't set the landing elevation in the pressurization controller until the aircraft has reached cruise altitude to preclude the cabin from descending to landing field elevation after takeoff. (Of course it does suck if you forget to set the landing elevation before descent, especially when the aircraft catches the cabin in the descent.)
During descent, the cabin pressure descent rate seems to descend at a constant rate unaffected by the actual aircraft descent rate, whether the aircraft is descending at 1000ft/min or descending at 7500ft/min.
On an EMB-135/145, I haven't noticed the same problems with ear discomfort in any phase of flight, that I have on a CRJ when the cabin is descending.
[Edited 2013-09-15 07:31:29]
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