PC12 PILOT EXPERIENCES EFIS LOC FAILURE ON APPROACH TO PDX. A SUBSEQUENT ILS 10L APPROACH WAS FLOWN ON THE ROUND DIAL GAUGES; THE GLIDE SLOPE FAILED ON THAT APPROACH AS WELL. RUNWAY 10R WAS SUBSEQUENTLY ACQUIRED VISUALLY AND TWR GAVE CLRNC TO LAND.

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INST FLT TO PDX. VECTORED TO INTERCEPT LOC 10L AT PDX. TUNED IN LOC FREQ 111.3 AND IDENTED. LOC DID NOT INDICATE ON THE INSTS. RECHKED THE FREQ AND CONFIRMED VERBALLY WITH PDX APCH CTL. STILL NO SUCCESS. REQUESTED VECTORS AWAY FROM LOC TO SORT OUT PROBS. ACCEPTED SEVERAL VECTORS WHILE ATTEMPTING TO SOLVE PROB. FLEW INTO VMC AND THEN REQUESTED IFR CANCELLATION WITH THE STATED INTENT TO REQUEST A SECOND IFR APCH TO PDX WHEN PROB WAS FIXED. FLEW AROUND FOR SEVERAL MORE MINS WHEN MECHANICAL #2 BEGAN TO INDICATE RECEPTION OF THE LOC. STILL NO INDICATION ON EFIS LOC INDICATIONS. REQUESTED SECOND ILS 10L LOC APCH TO PDX. IFR CLRNC WAS GRANTED. VECTORED TO INTERCEPT LOC AT BUXOM INTXN ON HDG MODE OF KFC 325 AUTOPLT. ARMED LOC APCH MODE OF THE AUTOPLT. CAPTURED THE ILS 10L LOC ON THE AUTOPLT. ACFT WAS TRACKING LOC ON THE AUTOPLT OUTSIDE OF TRAYL INTXN. SOMEWHERE BTWN TRAYL AND BLAZR INTXNS I SAW THE GS WAS NO LONGER CAPTURED. I DISCONNECTED THE AUTOPLT AND ATTEMPTED TO RECAPTURE THE GS MANUALLY. THIS WAS UNSUCCESSFUL. AT THIS TIME I REALIZED I WAS NO LONGER TRACKING THE LOC. FOR SITUATIONAL AWARENESS; I REFERRED TO MY GPS AND DETERMINED THAT I WAS WITHIN 2 MI OF THE ARPT AND APPROX 800 FT AGL. AT THIS MOMENT I ACQUIRED A RWY JUST TO MY R. THE TWR IDENTED THIS RWY AS RWY 10R AND CLRED ME TO LAND. I WAS CLRED TO TAXI TO THE FBO AND WAS TOLD TO CALL THE TWR; WHICH I DID. THE PURPOSE OF MY COMING TO PDX WAS TO RECEIVE MY ANNUAL REFRESHER TRAINING. MY INSTRUCTION AND I WENT OUT TO THE AIRPLANE AND CONDUCTED AN OPS CHK OF THE EFIS NAV EQUIP AND NAV RECEIVERS. INITIALLY NEITHER THE EFIS NOR MECHANICAL INDICATIONS SHOWED LOC RECEPTION. AFTER RESETTING THE FREQS TO BIG VOR AND RESETTING THE RECEIVERS TO THE 10L PDX LOC FREQS; WE RECEIVED BOTH THE EFIS AND MECHANICAL LOC RECEPTION. WE REQUESTED A MAINT OPS CHK BY THE FBO'S AVIONICS SHOP TECHNICIAN. ALL AVIONICS SYSTEMS CHKED FUNCTIONALLY.