Narrative:

On an instructional cross country flight with pre-private student, departed VFR out of salem, or, to follow coastline airports for ground speed check point practice. Upon arrival near coast with VFR conditions becoming marginal, I took the opportunity to give the student experience in actual IMC rather than to divert and land VFR -- get there-itis may have had a factor in that decision as the week's cross country flight was getting long. My decision to go IFR was based on what my student told me about his WX briefing, as I had not spoken with a preflight briefer but rather got my briefing unofficially from an internet WX site. I received a pop-up IFR clearance to crescent city along V27 where I planned to review WX to continue VFR to santa rosa. On the first leg from onp to oth at 7000 ft made PIREP for clouds and no ice temperature indicated approximately 2 degrees C. Onp-oth has lower MEA's and airmet was in effect for ice above freezing level. Crossing oth MEA's raise eliminating an escape from icing condition. Made decision to continue based on personal WX observation. 40 NM south of oth on V27 experience moderate-severe icing from super-cooled raindrops. Accumulated ice caused communication and navigation failures due to antenna ice. We descended through hole in clouds to land. Gold beach VFR under lost communication procedure. Called FSS on ground to give update of occurrence.

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Original NASA ASRS Text

Title: A C172 FLT INSTRUCTOR WITH A STUDENT GET INTO ICING CONDITIONS WHILE IMC AND EXPERIENCE A COM FAILURE.

Narrative: ON AN INSTRUCTIONAL XCOUNTRY FLT WITH PRE-PVT STUDENT, DEPARTED VFR OUT OF SALEM, OR, TO FOLLOW COASTLINE ARPTS FOR GND SPD CHK POINT PRACTICE. UPON ARR NEAR COAST WITH VFR CONDITIONS BECOMING MARGINAL, I TOOK THE OPPORTUNITY TO GIVE THE STUDENT EXPERIENCE IN ACTUAL IMC RATHER THAN TO DIVERT AND LAND VFR -- GET THERE-ITIS MAY HAVE HAD A FACTOR IN THAT DECISION AS THE WK'S XCOUNTRY FLT WAS GETTING LONG. MY DECISION TO GO IFR WAS BASED ON WHAT MY STUDENT TOLD ME ABOUT HIS WX BRIEFING, AS I HAD NOT SPOKEN WITH A PREFLT BRIEFER BUT RATHER GOT MY BRIEFING UNOFFICIALLY FROM AN INTERNET WX SITE. I RECEIVED A POP-UP IFR CLRNC TO CRESCENT CITY ALONG V27 WHERE I PLANNED TO REVIEW WX TO CONTINUE VFR TO SANTA ROSA. ON THE FIRST LEG FROM ONP TO OTH AT 7000 FT MADE PIREP FOR CLOUDS AND NO ICE TEMP INDICATED APPROX 2 DEGS C. ONP-OTH HAS LOWER MEA'S AND AIRMET WAS IN EFFECT FOR ICE ABOVE FREEZING LEVEL. XING OTH MEA'S RAISE ELIMINATING AN ESCAPE FROM ICING CONDITION. MADE DECISION TO CONTINUE BASED ON PERSONAL WX OBSERVATION. 40 NM S OF OTH ON V27 EXPERIENCE MODERATE-SEVERE ICING FROM SUPER-COOLED RAINDROPS. ACCUMULATED ICE CAUSED COM AND NAV FAILURES DUE TO ANTENNA ICE. WE DSNDED THROUGH HOLE IN CLOUDS TO LAND. GOLD BEACH VFR UNDER LOST COM PROC. CALLED FSS ON GND TO GIVE UPDATE OF OCCURRENCE.

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.