Narrative:

The aircraft had a deferred APU and a deferred left pack. I was already hesitant to take this plane with this combination of deferrals. The flight to our filed destination was very high workload but uneventful. On the flight from the airport; we did an unpressurized takeoff per the MEL. The takeoff was uneventful. We were cleared to climb to 7;000 ft. Leveled off there because of same direction traffic at 8;000. We acquired visual with the traffic 3 miles way from us and were told to maintain visual and continue the climb. As the power levers were advanced; we could feel the air conditioning fail. I looked at the EICAS and saw right pack off. There was no associate pack over press message; just right pack off. I looked at the ecs page and saw that the right pack was off and the 10th stage bleed was showing closed. Because there was no caution; there was no QRH page to refer to. I decided that we needed to try to reset the ecs. I commanded the 10th stage bleed closed and then open again. This worked. I then cycled the right pack and it came back on. When we landed and opened the thrust reversers; the same thing happened again. We taxied in with the pack off. This was a threat in that we lost pressurization at 8;000 for about 30 seconds. We were also tasked with keeping visual separation with the other traffic. While we did not lose separation; we did stop looking for the traffic as we dealt with this issue. Aircraft should never be dispatched with a deferred APU and a deferred pack. The workload dictated by the MEL and QRH is just too demanding.

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Original NASA ASRS Text

Title: A CRJ200's right engine 10th stage bleed closed and the right pack tripped OFF at 8;000 FT resulting in loss of pressurization because the left pack and APU were MEL'ed. The bleed and pack switches were recycled to restore pressurization.

Narrative: The aircraft had a deferred APU and a deferred left pack. I was already hesitant to take this plane with this combination of deferrals. The flight to our filed destination was very high workload but uneventful. On the flight from the airport; we did an unpressurized takeoff per the MEL. The takeoff was uneventful. We were cleared to climb to 7;000 FT. Leveled off there because of same direction traffic at 8;000. We acquired visual with the traffic 3 miles way from us and were told to maintain visual and continue the climb. As the power levers were advanced; we could feel the air conditioning fail. I looked at the EICAS and saw right pack off. There was no associate pack over press message; just right pack off. I looked at the ECS page and saw that the right pack was off and the 10th stage bleed was showing closed. Because there was no caution; there was no QRH page to refer to. I decided that we needed to try to reset the ECS. I commanded the 10th stage bleed closed and then open again. This worked. I then cycled the right pack and it came back on. When we landed and opened the thrust reversers; the same thing happened again. We taxied in with the pack off. This was a threat in that we lost pressurization at 8;000 for about 30 seconds. We were also tasked with keeping visual separation with the other traffic. While we did not lose separation; we did stop looking for the traffic as we dealt with this issue. Aircraft should never be dispatched with a deferred APU and a deferred pack. The workload dictated by the MEL and QRH is just too demanding.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.