WAKE VORTEX ENCOUNTER AND LOSS OF ACFT CTL IN A PA31-350 WHEN THE PLT IS TOLD BY TWR CTLR TO GO AROUND BECAUSE LNDG B727 HAD NOT YET CLRED RWY 18 AT PABE; AK.

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A PIPER NAVAJO CHIEFTAN; (PA31-350) WAS ON VISUAL APCH TO RWY 18; BETHEL; AK; FOLLOWING A B727. THE B727 MADE A NORMAL; UNEVENTFUL LNDG AND WAS IN THE PROCESS OF TAXIING CLR OF THE ACTIVE RWY WHEN THE BETHEL TWR CTLR REQUESTED THE NAVAJO 'GO AROUND AND MAINTAIN RWY HEADING' DUE TO TFC STILL ON THE RWY. I COMPLIED WITH THE TWR CTLR'S REQUEST AND APPLIED PWR AND BEGAN A GAR FROM 200 FT; WHEN MY ACFT WAS 'ROCKED' BY THE WINGTIP VORTICES OF THE ALREADY LANDED B727. WIND AT THE TIME WAS RPTED BY BETHEL ATIS AS 'CALM.' MY PA31-350 ACFT ENTERED AN UNCOMMANDED R BANK OF 60 DEGS AND 'I WAS PULLED FORWARD AND R ABRUPTLY.' I CONFIRMED THAT BOTH ENGS WERE MAKING FULL PWR. I APPLIED OPPOSITE AILERON INPUT TO COUNTERACT THE UNCOMMANDED BANK. I WAS UNABLE TO ESCAPE THE EFFECTS OF THE WINGTIP VORTICES. I EXITED THE VORTEX APPROX 800 FT HORIZ LATER. UPON EXITING THE VORTICES THE AIRPLANE ACCELERATED; AND I FELT PRESSURE IN THE CTLS. THE AIRPLANE WINGS LEVELED; AND THEN THE ACFT ENTERED A SECOND UNCOMMANDED BANK OF 20-30 DEGS THIS TIME TO THE L. AT APPROX 1/4 THE WAY DOWN THE RWY; I REGAINED COMPLETE CTL. I REESTABLISHED RWY HEADING AND CTRLINE. THE BETHEL TWR CTLR APOLOGIZED AND REQUESTED THAT I JOIN L DOWNWIND; CLRED TO LAND FOLLOWING A TWIN OTTER (DHC-6). I FOLLOWED THE REQUEST AND LANDED SAFELY. UPON TAXIING CLR OF THE ACTIVE RWY THE BETHEL TWR/GND CTLR ASKED 'IS EVERYONE OK?' I REPLIED 'YES.' UPON REACHING THE PARKING AREA; THE ACFT ENGS ARE SHUT DOWN; I ONCE AGAIN CHKED WITH THE PAX TO RECONFIRM THAT EVERYBODY WAS OK. I DISCOVERED THAT THERE WERE NO INJURIES. WHEN THE TWR GAVE ME CLRNC TO LAND I LOOKED TO SEE WHERE THE B727 WAS ON HIS APCH. AT THE TIME I FELT I WAS FAR ENOUGH BEHIND THE B727 TO LIMIT MY EXPOSURE TO HIS WAKE TURB. OBVIOUSLY THIS WAS INCORRECT. I WILL DEFINITELY IN THE FUTURE GIVE THE B727 MORE ROOM; EVEN IF THAT MEANS NOT ACCEPTING A LNDG CLRNC AS GIVEN.