Narrative:

After takeoff from runway 1; multiple irregularities showed up and continued to show up as we departed the area and were climbing to altitude. I had no airspeed indications on the pilot's side except in reversion; air data computer #1 seemed to have failed. The yaw damper light continued to come on after reset; aileron feel annunciator light was on steady; aileron zero annunciator light was cycling on and off. After trying to assess our problem and thinking we had taken in water in a critical area; during the process of thawing out the aircraft from a previous day's 3 inch snow fall; I elected to return to ZZZ. ATC advised that due to the problems we were encountering and the heavy traffic area; they were going to issue an emergency for us to expedite our arrival back to ZZZ; we returned and landed normally. Postflt found our pilot side pitot tube still had the pitot cover installed. Aircraft was re-dispatched and continued to EST. As embarrassing as this is and it is no excuse and none is intended; our pitot covers were missing the red remove before flight flags and consequently these covers; made of metal; just slightly larger than the pitot tube itself and as we now know; are easily overlooked.

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Original NASA ASRS Text

Title: F2TH FLT CREW TAKES OFF WITH L PITOT COVER INSTALLED. MULTIPLE RESULTING ANOMALIES RESULT IN RETURN TO DEP ARPT.

Narrative: AFTER TKOF FROM RWY 1; MULTIPLE IRREGULARITIES SHOWED UP AND CONTINUED TO SHOW UP AS WE DEPARTED THE AREA AND WERE CLBING TO ALT. I HAD NO AIRSPD INDICATIONS ON THE PLT'S SIDE EXCEPT IN REVERSION; ADC #1 SEEMED TO HAVE FAILED. THE YAW DAMPER LIGHT CONTINUED TO COME ON AFTER RESET; AILERON FEEL ANNUNCIATOR LIGHT WAS ON STEADY; AILERON ZERO ANNUNCIATOR LIGHT WAS CYCLING ON AND OFF. AFTER TRYING TO ASSESS OUR PROB AND THINKING WE HAD TAKEN IN WATER IN A CRITICAL AREA; DURING THE PROCESS OF THAWING OUT THE ACFT FROM A PREVIOUS DAY'S 3 INCH SNOW FALL; I ELECTED TO RETURN TO ZZZ. ATC ADVISED THAT DUE TO THE PROBS WE WERE ENCOUNTERING AND THE HVY TFC AREA; THEY WERE GOING TO ISSUE AN EMER FOR US TO EXPEDITE OUR ARR BACK TO ZZZ; WE RETURNED AND LANDED NORMALLY. POSTFLT FOUND OUR PLT SIDE PITOT TUBE STILL HAD THE PITOT COVER INSTALLED. ACFT WAS RE-DISPATCHED AND CONTINUED TO EST. AS EMBARRASSING AS THIS IS AND IT IS NO EXCUSE AND NONE IS INTENDED; OUR PITOT COVERS WERE MISSING THE RED REMOVE BEFORE FLT FLAGS AND CONSEQUENTLY THESE COVERS; MADE OF METAL; JUST SLIGHTLY LARGER THAN THE PITOT TUBE ITSELF AND AS WE NOW KNOW; ARE EASILY OVERLOOKED.

Data retrieved from NASA's ASRS site as of January 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.