INSTRUCTOR PLT TAKES STUDENT PLT INTO ICING ON AN IFR PRACTICE XCOUNTRY IN AN AIRPLANE NOT CERTIFICATED FOR ICING HAS TO REVERSE COURSE WITHOUT ATC COORD.

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HOW THE PROB AROSE: MY STUDENT AND I WERE ON AN IFR TRAINING FLT FROM ALAMOSA; CO; TO TAOS; NM. WHILE INBOUND TO THE ALS VOR FROM THE ALAMOSA ARPT WE ENCOUNTERED IMC CONDITIONS AT APPROX 3800 FT AGL. LIGHT TO MODERATE TURB AND SNOW WAS ENCOUNTERED BUT NO ICING AT THIS POINT. OUTBOUND FROM THE ALS VOR AT 10 DME ON V83 AT 12000 FT MSL WE BEGAN TO EXPERIENCE LIGHT TO MODERATE RIME ICE. AT 15 DME THE ICE ACCUMULATION RATE INCREASED RAPIDLY AND CHANGED TO MIXED RIME AND CLR ICE. I INSTRUCTED MY STUDENT TO CONTACT ZDV AND RPT OUR ICING CONDITIONS AND THIS HE DID. CTR REQUESTED WE KEEP THEM INFORMED AND LET CTR KNOW IF WE NEEDED A DIFFERENT ALT. SHORTLY THEREAFTER I MADE THE DECISION THAT CONTINUED FLT IN OUR PRESENT CONDITIONS WAS NOT SAFE AND INSTRUCTED MY STUDENT TO REVERSE COURSE AND TO CONTACT CTR TO ADVISE THEM OF OUR CHANGE IN COURSE. AS WE APCHED THE ALS VOR THE ICE ACCUMULATION RATE DECREASED. MY STUDENT WAS HAVING A GREAT DEAL OF DIFFICULTY CTLING THE AIRPLANE AND I WAS FREQ TAKING THE AIRPLANE FROM HIM TO CORRECT ALT AND/OR HDG. I HEARD HIM TRY TO CONTACT CTR SEVERAL TIMES BUT WE RECEIVED NO REPLY FROM CTR. WE COULD HEAR CTR WORKING SEVERAL AIRPLANES. LOOKING BACK I AM NOW UNSURE IF MY STUDENT WAS KEYING THE MIKE CORRECTLY. EVENTUALLY CTR DID REPLY AND WE NOTIFIED CTR OF OUR COURSE REVERSAL; PRESENT POS AND ALT; AND REQUESTED THE VOR-DME-B APCH TO ALAMOSA. AT THIS TIME WE ARE NOW DIRECTLY OVER THE ALS VOR AT 12000 FT MSL. A COUPLE MIN EARLIER CTR HAD RELEASED ANOTHER ACFT IFR FROM ALAMOSA TO THE ALS VOR. SO NOW CTR HAD 2 ACFT AT THE ALS VOR BOTH OF US IN IMC CONDITIONS AND BELOW RADAR COVERAGE. CTR WAS ABLE TO STOP THE OTHER ACFT AT 11000 FT MSL AND NO TFC CONFLICT RESULTED. WE COMPLETED THE APCH TO THE ALAMOSA ARPT AND LANDED WITHOUT ANY PROBS.