SMA TAXIED ACROSS ACTIVE RWY CAUSING ABORTED TKOF.

Narrative

I WAS RETURNING TO KNOXVILLE UNDER THE RULES OF FAR 91. I WAS OPERATING ON AN IFR FLT PLAN WHICH WAS PICKED UP AT TRI CITIES (TRI). AS I WAS APCHING KNOXVILLE I WAS GIVEN VECTORS TO THE ILS 5L APCH COURSE. DURING THE FINAL TURN TO JOIN THE LOC MY HSI STARTED TO SPIN. I WENT MISSED APCH AT THIS TIME AND REQUESTED A HEADING OUT OF THE APCH CORRIDOR TO SORT THINGS OUT. THE CTLR IMMEDIATELY GAVE ME A NEW HEADING AND A HIGHER ALT. I WAS FLYING AN SMA WHICH HAD CO-PLT INSTRUMENTS. I BELIEVE THAT I HAD A VACUUM PUMP FAILURE BUT THE ANNUNCIATOR PANEL WAS UNLIT AND PRESSURE SHOWED GOOD ON THE VACUUM GAUGE (5.5 PSI). DURING THE TURNS I ALSO HAD LOST MY ATTITUDE INDICATOR ON THE PLTS SIDE AND HAD NOTICED THAT THE ATTITUDE INDICATOR ON THE COPLTS SIDE DID NOT AGREE WITH EITHER TURN COORDINATOR; ALSO THE COPLT'S HEADING INDICATOR WAS PRECESSING BEYOND THE POINT OF BEING USABLE. I THEN REQUESTED AN ASR APCH FROM TYS CTLRS. I WAS GRANTED THIS REQUEST AND GIVEN 120.65 AS THE NEW FREQUENCY. DURING THE APCH I USED ASSIGNED HDGS AND MY COMPASS AND TURN AND BANK. ON THE ROLL-OUT I WAS GIVEN 121.9 FOR TAXI INSTRUCTIONS. I WAS TOLD BY GND TO TURN RIGHT OFF 5L AND TAXI AND HOLD SHORT OF 5R. WHILE TAXIING I WAS TRYING TO THINK OF WHAT WAS WRONG WITH THE FLT INSTRUMENTS. WHEN I LOOKED UP I HAD ALREADY CROSSED THE HOLD LINES FOR 5R. I IMMEDIATELY GAVE MORE POWER AND CONTINUED ACROSS TRYING TO CLEAR THE RWY. AFTER CLEARING GND INFORMED ME OF AN ABORTED TKOF OF AN ACR FLT THAT I HAD CAUSED. I THEN PARKED THE ACFT; SHUT DOWN AND WENT INSIDE THE FBO AND CALLED THE TWR; I THEN I WENT HOME AND CALLED THE NASHVILLE FSDO AND EXPLAINED WHAT HAD HAPPENED AND GAVE HIM WHAT INFORMATION I HAD. IT IS MY BELIEF THAT AT THE TIME OF THE ACCIDENT I WAS MENTALLY FATIGUED. I HAD BEEN FLYING IN IMC CONDITIONS PARTIAL PANEL FOR ABOUT 20 MINUTES. I HAD MADE AN ASR APCH WITH PARTIAL PANEL. THIS PUT TOGETHER WITH INATTENTION (OF WHAT WAS GOING ON OUTSIDE OF THE ACFT) DURING A CRITICAL PHASE OF OPERATION. ALLOWED FOR THIS INCIDENT