PLT OF A BEECH BE36TC FAILED TO SWITCH TO GND CTL FREQ AFTER LNDG DUE TO AN EMER RETURN TO THE ARPT; WHEREIN THE TURBINE INLET TEMP EXCEEDED RED LINE. BECAUSE OF THIS; THE PLT WAS DISTR FROM HIS NORMAL FLYING TASKS AFTER SUCCESSFULLY LNDG AND FORGOT TO CONTACT GND CTL.

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AFTER A NORMAL PREFLT AND RUNUP; I DEPARTED THE PAO ARPT TO THE W; PIC AND SOLE PERSON ON BOARD. WX VMC; CLR SKY; VISIBILITY PERHAPS 15-20 MI. AFTER ABOUT 8 MINS; I REACHED MY INITIAL CRUISING ALT AND CONFIGURED THE ACFT FOR CRUISE. CHKING THE ENG INSTS SHORTLY AFTER; I SAW THE DIGITAL READOUT OF THE TURBINE INLET TEMP FOR THE TURBOCHARGER WAS ABNORMALLY HIGH. ALL CHT'S AND EGT'S ON THE GRAPHIC ENG MONITOR WERE NORMAL. I LOOKED ACROSS AT THE ANALOG (MASTER) TURBINE INLET TEMP IN TIME TO SEE THE GAUGE PASS THROUGH RED LINE AND PEG ITSELF AGAINST THE R END STOP IN PERHAPS 1-2 SECONDS. THE MIXTURE WAS FULL RICH SO I PULLED THE THROTTLE TO IDLE AND STARTED A 180 DEG TURN BACK TO THE ARPT; SOME 8 MI OR SO AWAY (STILL THE NEAREST). THE TURBINE INLET TEMP FELL WITH THE IDLE THROTTLE AS I BEGAN TO DSND. I CAUTIOUSLY AND SLOWLY APPLIED PWR TO MAINTAIN ALT WHILE MONITORING THE ENG INSTS. I WAS AT A LOSS AS TO WHAT WAS HAPPENING. WHILE THE ENG CONTINUED TO RUN; I ANTICIPATED THE WORST AND DECIDED THAT GETTING BACK ON THE GND IN THE SHORTEST POSSIBLE TIME WAS THE #1 PRIORITY. I CALLED PAO AND EXPLAINED I HAD A HIGH AND FLUCTUATING TURBINE INLET TEMP AND REQUESTED AN EXPEDITED CLRNC BACK INTO THE CLASS D AIRSPACE FOR LNDG. THIS WAS QUICKLY APPROVED AS I CONTINUED BACK TO THE ARPT. DURING THE DSCNT; THE TURBINE INLET TEMP MADE 1 OR 2 BRIEF EXCURSIONS FROM NORMAL BUT RETURNED TO NORMAL. I STAYED HIGH THROUGHOUT THE APCH TO LNDG UNTIL I HAD THE RWY MADE. THE LNDG WAS SMOOTH AND I LET THE ACFT RUN TO THE END OF THE RWY AND THEN TURNED OFF. I THINK I CAN SAFELY SAY THAT I HAVE NEVER BEEN SO GLAD TO GET BACK ON THE GND. I PAUSED FOR A MIN OR SO REFLECTING ON THE FLT. I WAS SHAKEN; BUT THANKFULLY IN 1 PIECE. I CLEANED UP THE ACFT AND THEN CHKED THE CHKLIST - - THIS WAS NOT A TIME TO TRUST TO MEMORY. VERIFIED OK AND BEGAN TO TAXI. IT WAS ONLY AS I APCHED THE TWR THAT I REALIZED I HAD FAILED TO SWITCH TO GND CTL AND WAS STILL ON THE TWR FREQ. I SWITCHED OVER TO GND CTL IN TIME TO HEAR THE CTLR ASK IF I WAS ON FREQ. I HAD COMMENCED TAXI WITHOUT CLRNC! AFTER APOLOGIZING TO THE GND CTLR; I RECEIVED PERMISSION TO TAXI. FORTUNATELY THERE HAD BEEN NO CONFLICTING GND TFC. HUMAN PERFORMANCE: IT WAS ONLY AFTER THE LNDG THAT I FELT SHAKEN. DURING THE TIME OF THE FLT FROM THE TURBINE INLET TEMP EXCURSION TO THE LNDG; I WAS AFRAID BUT IN CTL -- CLRLY THE FIRST PRIORITY WAS GETTING ON THE GND. LNDG WAS A HUGE RELIEF. AT THAT POINT I WAS DISTR BY THE EVENTS OF THE FLT AND FAILED TO COMPLY WITH THE TWR CTLR'S INSTRUCTION TO CONTACT GND CTL. I HAD DELIBERATELY USED THE POSTLNDG CHKLIST BECAUSE I FELT THE LEVEL OF DISTR. I CANNOT EXPLAIN WHY I DIDN'T CONTACT GND CTL; I WAS STILL DISTR AND DIDN'T REMEMBER. PREVENTING RECURRENCE: I AM AMENDING MY CHKLIST TO ADD 'CONTACT GND CTL' AS THE FINAL ITEM ON THE AFTER LNDG CHKLIST. HOPEFULLY THIS WILL SERVE AS A FINAL REMINDER FOR THE NEXT TIME SOMETHING CAUSES SUCH LEVELS OF DISTR.