A CORPORATE JET REJECTS TKOF WHEN A SINGLE ENGINE PISTON ACFT DEPARTS FROM AN INTERSECTING RWY AT AN UNCONTROLLED ARPT.

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A BARON; ACFT X; HAD FILED AN IFR PLAN FROM KEAU TO 'X' OBTAINED LATEST AWOS ANNOUNCED TAXI TO RWY 14 ON FREQ 123.6; NOTING TWO ACFT MOVING ON GND: CESSNA 402 AND CITATION JET; ACFT Y. CESSNA 402 DEPARTING RWY 22; AFTER WHICH X ANNOUNCED ON 123.6 XING RWY 22 AND TAXIING TO RWY 14. AFTER RUN-UP ON DEP END RWY 14X REQUESTED IFR CLEARANCE FROM ZMP ON RCO FREQ 125.3 WHILE MONITORING 123.6. CENTER ADVISED 5 MINUTE HOLD FOR CLRNC AND RELEASE. INBOUND WESTWIND JET ANNOUNCED ARPT IN SIGHT ON 8 MILE FINAL AND CANCELLED IFR; AFTER WHICH CENTER CLEARED AND RELEASED ACFT X IFR TO KMSN. ACFT X ANNOUNCED ON FREQ 123.6 THAT ACFT X WAS TAKING RWY 14 FOR TKOF; MADE SECOND ANNOUNCEMENT 'ROLLING RWY 14'. CITATION Y CALLED 'BARON TAKING OFF RWY 14' AND REPORTED THAT CITATION HAD TO ABORT TKOF ROLL WITHIN FIRST 1000 FT OF DEP END RWY 22 ACCOUNT TFC CONFLICT WITH BARON. BARON X ADVISED CITATION ON 123.6 THAT X HAD NOT HEARD AN ANNOUNCEMENT FROM CITATION Y RELATIVE TO TAKING RWY 22 OR STARTING TKOF ROLL. CITATION THEN INITIATED TKOF FROM POINT OF ABORTED TKOF AND PRIOR TO WESTWIND BEING ON CLOSE-IN FINAL. BARON X CONTACTED CENTER 125.3 TO RPT AIRBORNE AND HEARD CITATION Y CALL FOR IFR CLRNC. BARON ASKED CITATION TO SWITCH TO 122.9; CITATION COMPLIED; BARON X AGAIN RPTED TO CITATION THAT BARON NEVER HEARD RPT TO TKOF ROLL; HAD BEEN RELEASED BY CENTER AND ACFT X ANNOUNCED TWICE REGARDING DEPARTING RWY 14. POSSIBLE CONTRIBUTING FACTORS: OBSTRUCTED VISUAL FROM DEP END RWY 14 TO DEP END RWY 22. NECESSITY OF USING SEVERAL FREQ AT SAME TIME FOR AWOS (119.67) COMMUNICATION (123.6); CLRNC (125.3) LIGHTING CONTROL (122.95) AT KEAU CREATING OPPORTUNITY FOR XMIT OR MONITOR ON WRONG FREQ. COINCIDENTAL SIMULTANEOUS DEP ANNOUNCEMENTS; BLOCKING EACH ACFT'S ABILITY TO RECEIVE. SUGGESTIONS: REQUIRE ALL IFR OUTBOUNDS FROM KEAU TO OBTAIN CLRNC WHILE ON THE GND VIA CENTER RCO 125.3. REINSTATE LOCAL ADVISORY CONTROL FREQ. GIVE PRIORITY TO WIND FAVORED RWY AND ANNOUNCE ON AWOS WHICH WOULD ALERT ALL ACFT ABOUT USE OF RWYS OTHER THAN THE MOST LENGTHY IN VISUAL DEP CONDITIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID DURING CALL BACK THAT TREES OBSTRUCT THE VIEW; TO SOME EXTENT; OF RWY 22 FROM HIS POS ON RWY 14 AT THAT BEGINNING OF THE TKOF. THE CITATION WAS ON THE CTAF FREQ BECAUSE HIS RPT OF THE REJECT WAS HEARD. THAT INDICATED THAT THEY MAY HAVE BROADCAST SIMULTANEOUSLY THEIR INDIVIDUAL TKOF ANNOUNCEMENT. THE GND OP OF THE CITATION; WHEN OBSERVED BY THE RPTR; APPEARED TO BE RUSHED. IT INCLUDED AN ARRIVAL; A QUICK DROP OFF OF A PAX AN DEP WITHOUT THE CREW LEAVING THE ACFT.