Narrative:

Taking off; winds were gusty with moderate turbulence on departure. Reaching acceleration altitude and increasing airspeed; I called for flaps to be retracted to the 1 position. As we approached vt speed; I asked for the flaps to be retracted to zero; and it was during this point in time; we experience a short turbulent sink and a momentary sps (stall protection system) stick shaker and autopilot disconnect. We had only had this aircraft for the round trip; and I was noticing the low speed awareness (green line) and lower stall strip showing itself in a part of the speed strip that was a little abnormal; but not so much as to be concerning to its accuracy. The aircraft quickly accelerated and the sps was very brief in nature with no further actions needed. [After landing]; I ask mx to check the pitot/static traps for water; and water was found in one of the traps; about 1/3 of the tube was full.neither of us recall anything abnormal to our departure; and finding water in the trap may have affected the sps to some degree; along with the turbulence and short sink during flap retraction to zero.I am under the understanding that the traps are not checked on service checks; but maybe go as far as routine checks before they are checked for water. Considering rvsm; and pitot/static related errors; I would like to have the traps checked at each service check.

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Original NASA ASRS Text

Title: CRJ-900 Captain reported that a short turbulent sink and a momentary SPS (Stall Protection System) stick shaker and autopilot disconnect took place.

Narrative: Taking off; winds were gusty with moderate turbulence on departure. Reaching Acceleration Altitude and increasing airspeed; I called for flaps to be retracted to the 1 position. As we approached VT speed; I asked for the flaps to be retracted to zero; and it was during this point in time; we experience a short turbulent sink and a momentary SPS (Stall Protection System) stick shaker and autopilot disconnect. We had only had this aircraft for the round trip; and I was noticing the low speed awareness (green line) and lower stall strip showing itself in a part of the speed strip that was a little abnormal; but not so much as to be concerning to its accuracy. The aircraft quickly accelerated and the SPS was very brief in nature with no further actions needed. [After landing]; I ask MX to check the Pitot/Static traps for water; and water was found in one of the traps; about 1/3 of the tube was full.Neither of us recall anything abnormal to our departure; and finding water in the trap may have affected the SPS to some degree; along with the turbulence and short sink during flap retraction to zero.I am under the understanding that the traps are not checked on service checks; but maybe go as far as routine checks before they are checked for water. Considering RVSM; and Pitot/Static related errors; I would like to have the traps checked at each service check.

Data retrieved from NASA's ASRS site 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.