Narrative:

The event happened during cruise flight at FL390. We first noticed altitude fluctuations of 100-150 ft. Moments later; the autoplt disengaged. The captain then re-engaged the autoplt. Approximately 10 seconds after the autoplt disengaged for a second time; we received a stall warning on the captain's side only; both stick shakers; a stall fail caution message; and a red airspeed tape indication. The captain then immediately started a descent while I contacted ATC and advised them of our need to descend. ATC gave us a lower altitude of FL340; where the captain leveled off and re-engaged the autoplt. Within mins; the autoplt disengaged; and we again received all the stall indications previously mentioned. At this point; I was instructed by the captain to declare an emergency and request a lower altitude. We were given FL210. Throughout 3000 FPM descent from FL340 to FL280; we were receiving all the prior mentioned stall indications. This second occurrence lasted 30-40 seconds; nearly twice as long as our first stall indication. The stall indications cleared around FL280. We continued our descent to FL210; where the autoplt was re-engaged. Throughout our descent; I was working with ATC and our dispatch; via the radio and ACARS; to find a suitable alternate. We were assigned ZZZ as our alternate. While en route to ZZZ; we reviewed the appropriate checklists. Throughout this time; the plane appeared to be flying normal. Crash fire rescue equipment was requested in ZZZ. We landed without any further problems. Upon deplaning; the captain was informed by the ground crew that all the bags were loaded in the aft cargo bin; leaving the center and forward cargo bins completely empty. I believe the event occurred due to the fact that all the bags were loaded in the aft cargo bin; leaving the forward and center cargo bins empty. This negatively affected our weight and balance numbers as well as our center of gravity. I believe that we need to be given cargo weights for each individual bin in order to verify that the bins are loaded correctly and evenly.

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Original NASA ASRS Text

Title: CRJ900 FLT CREW REPORTS AUTOPILOT DISCONNECT AND STALL WARNING AT FL390. FLT CREW DESCENDS WITH INTERMITTENT STALL WARNINGS THROUGH FL280 AND DECLARES EMERGENCY. AFTER LANDING; ALL BAGGAGE IS FOUND LOADED IN THE AFT COMPARTMENT.

Narrative: THE EVENT HAPPENED DURING CRUISE FLT AT FL390. WE FIRST NOTICED ALT FLUCTUATIONS OF 100-150 FT. MOMENTS LATER; THE AUTOPLT DISENGAGED. THE CAPT THEN RE-ENGAGED THE AUTOPLT. APPROX 10 SECONDS AFTER THE AUTOPLT DISENGAGED FOR A SECOND TIME; WE RECEIVED A STALL WARNING ON THE CAPT'S SIDE ONLY; BOTH STICK SHAKERS; A STALL FAIL CAUTION MESSAGE; AND A RED AIRSPD TAPE INDICATION. THE CAPT THEN IMMEDIATELY STARTED A DSCNT WHILE I CONTACTED ATC AND ADVISED THEM OF OUR NEED TO DSND. ATC GAVE US A LOWER ALT OF FL340; WHERE THE CAPT LEVELED OFF AND RE-ENGAGED THE AUTOPLT. WITHIN MINS; THE AUTOPLT DISENGAGED; AND WE AGAIN RECEIVED ALL THE STALL INDICATIONS PREVIOUSLY MENTIONED. AT THIS POINT; I WAS INSTRUCTED BY THE CAPT TO DECLARE AN EMER AND REQUEST A LOWER ALT. WE WERE GIVEN FL210. THROUGHOUT 3000 FPM DSCNT FROM FL340 TO FL280; WE WERE RECEIVING ALL THE PRIOR MENTIONED STALL INDICATIONS. THIS SECOND OCCURRENCE LASTED 30-40 SECONDS; NEARLY TWICE AS LONG AS OUR FIRST STALL INDICATION. THE STALL INDICATIONS CLRED AROUND FL280. WE CONTINUED OUR DSCNT TO FL210; WHERE THE AUTOPLT WAS RE-ENGAGED. THROUGHOUT OUR DSCNT; I WAS WORKING WITH ATC AND OUR DISPATCH; VIA THE RADIO AND ACARS; TO FIND A SUITABLE ALTERNATE. WE WERE ASSIGNED ZZZ AS OUR ALTERNATE. WHILE ENRTE TO ZZZ; WE REVIEWED THE APPROPRIATE CHKLISTS. THROUGHOUT THIS TIME; THE PLANE APPEARED TO BE FLYING NORMAL. CFR WAS REQUESTED IN ZZZ. WE LANDED WITHOUT ANY FURTHER PROBS. UPON DEPLANING; THE CAPT WAS INFORMED BY THE GND CREW THAT ALL THE BAGS WERE LOADED IN THE AFT CARGO BIN; LEAVING THE CTR AND FORWARD CARGO BINS COMPLETELY EMPTY. I BELIEVE THE EVENT OCCURRED DUE TO THE FACT THAT ALL THE BAGS WERE LOADED IN THE AFT CARGO BIN; LEAVING THE FORWARD AND CTR CARGO BINS EMPTY. THIS NEGATIVELY AFFECTED OUR WT AND BAL NUMBERS AS WELL AS OUR CTR OF GRAVITY. I BELIEVE THAT WE NEED TO BE GIVEN CARGO WTS FOR EACH INDIVIDUAL BIN IN ORDER TO VERIFY THAT THE BINS ARE LOADED CORRECTLY AND EVENLY.

Data retrieved from NASA's ASRS site as of May 2009 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.