PA31 AT ANC CROSSES UNDER THE ARR PATH OF AN MD11 AND ENCOUNTERS WAKE TURB THAT CAUSES CONSIDERABLE DAMAGE TO THE ACFT.

Narrative

ATX X; A PA31; CROSSED THE FLT PATH OF ACR Y MD11; LESS THAN 1000 FT AND 5 MI BEHIND. PLT OF NAVAJO CLAIMED HE ENCOUNTERED WAKE TURB THAT DAMAGED HIS ACFT. EACH ACFT WAS UNDER THE CTL OF A DIFFERENT SECTOR. THE NAVAJO WAS VOLUNTARILY PARTICIPATING IN CLASS C SVC; OUTSIDE THE INNER AND OUTER CIRCLES. THE ANC TWR QUALITY ASSURANCE SPECIALIST ADVISED ME THAT THIS LOSS OF SEPARATION OCCURS MANY TIMES AN HR -- THAT NO SATISFACTORY PROC EXISTS TO PREVENT IT. CONTRIBUTING FACTORS: JUST RECEIVED POS FROM ANOTHER CTLR WHO WAS USING LIMITED DATA BLOCK DISPLAY OF FINAL RADAR ACFT Y. AIR TAXI OPERATORS HAVE FOR YRS INSISTED TO TRAVEL THE SHORELINE 4 MI N OF ANC AT 1000 FT MSL; FOREVER CONFLICTING WITH RWY 32 DEPS AND RWY 14 ARRS. WX INFO DISPLAY (IDS-4) WAS OTS CAUSING ME TO LEAVE POS TO SEEK WX INFO ACROSS THE ROOM WHEN I SHOULD HAVE BEEN ISSUING TFC. I HAD JUST ASSUMED IMPROPERLY SET UP POS -- NO WX; NO DISPLAY OF FINAL RADAR DATA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE PLT WAS NOT GIVEN AN ADVISORY AND MAY NOT HAVE SEEN THE MD11 UNTIL AFTER THE EVENT. THE RPTR SAID THE PA31; INBOUND TO MRI; AT 900 FT; HAD CROSSED 2.4 NM BEHIND THE MD11. THE MD11 HAD BEEN AT 1200 FT. THE PA31 SUSTAINED SEVERE WRINKLING ON BOTH WINGS. THE RPTR STATED THE PA31 HAS FILED A SUIT AGAINST THE FAA AND THAT THE NTSB IS INVESTIGATING THE INCIDENT. THE CTLR SAID THE FACILITY IS CONDUCTING A QUALITY ASSURANCE REVIEW OF THE INCIDENT BECAUSE FACILITY PROCS MAY NOT HAVE BEEN FOLLOWED.