Narrative:

We left ffo (wright-patterson AFB) on an instrument flight plan. We had filed for 8000 ft. It was our desire to get some practice in actual instrument conditions. Therefore we asked datyon approach for climb to 10000 ft and they granted our request. Upon doing so, and remaining there for several mins, we began to encounter some rime ice formation. The quantity of ice would have been described as trace. We noticed a small jump in our instruments and assumed we had hit an updraft. A couple of mins later we noticed an increase in our airspeed and a much greater (approximately 800 ft) change in our instruments. At this time we realized that we had not turned on our pitot heat. As soon as we did this, our instruments stabilized and we called the controller and advised them of the situation. We began our climb back to our assigned altitude. We experienced no problems from there on. Since we still appeared to be picking up a trace of ice, we descended to 8000 ft to get out of the clouds. I feel the contributing factors in this situation were my lack of experience in dealing with an icing situation. Personal corrective actions that I took upon returning from this flight to help to insure this same error does not occur again were my discussions with a cfii and the wright-patterson AFB chief of flight safety.

Related reports:

Google
 

Original NASA ASRS Text

Title: SMA ON IFR FLT PLAN ENCOUNTERS ICING. PITOT SYS CAUSES ERRONEOUS INST INDICATIONS.

Narrative: WE LEFT FFO (WRIGHT-PATTERSON AFB) ON AN INST FLT PLAN. WE HAD FILED FOR 8000 FT. IT WAS OUR DESIRE TO GET SOME PRACTICE IN ACTUAL INST CONDITIONS. THEREFORE WE ASKED DATYON APCH FOR CLB TO 10000 FT AND THEY GRANTED OUR REQUEST. UPON DOING SO, AND REMAINING THERE FOR SEVERAL MINS, WE BEGAN TO ENCOUNTER SOME RIME ICE FORMATION. THE QUANTITY OF ICE WOULD HAVE BEEN DESCRIBED AS TRACE. WE NOTICED A SMALL JUMP IN OUR INSTS AND ASSUMED WE HAD HIT AN UPDRAFT. A COUPLE OF MINS LATER WE NOTICED AN INCREASE IN OUR AIRSPD AND A MUCH GREATER (APPROX 800 FT) CHANGE IN OUR INSTS. AT THIS TIME WE REALIZED THAT WE HAD NOT TURNED ON OUR PITOT HEAT. AS SOON AS WE DID THIS, OUR INSTS STABILIZED AND WE CALLED THE CTLR AND ADVISED THEM OF THE SIT. WE BEGAN OUR CLB BACK TO OUR ASSIGNED ALT. WE EXPERIENCED NO PROBS FROM THERE ON. SINCE WE STILL APPEARED TO BE PICKING UP A TRACE OF ICE, WE DSNDED TO 8000 FT TO GET OUT OF THE CLOUDS. I FEEL THE CONTRIBUTING FACTORS IN THIS SIT WERE MY LACK OF EXPERIENCE IN DEALING WITH AN ICING SIT. PERSONAL CORRECTIVE ACTIONS THAT I TOOK UPON RETURNING FROM THIS FLT TO HELP TO INSURE THIS SAME ERROR DOES NOT OCCUR AGAIN WERE MY DISCUSSIONS WITH A CFII AND THE WRIGHT-PATTERSON AFB CHIEF OF FLT SAFETY.

Data retrieved from NASA's ASRS site as of July 2007 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.