CESSNA CITATION AND SINGLE ENG CESSNA HAD NMAC 2 MI W OF EGE ARPT.

Narrative

AFTER TKOF FROM EAGLE; CO; WE BEGAN THE IFR CLBOUT (RWY 25) PROC. THE CHK PLT WAS MONITORING NAVAIDS; RADIOS; AND BACKING UP THE PLT ON ASSIGNED ATC PROCS. THE PLT (ME) WAS FLYING THE AIRPLANE AND CLRING. WHILE ROLLING OUT ON THE 215 DEG IFR DEP PROC HDG; I WAS ALSO WATCHING THE RAPIDLY RISING TERRAIN ON THE R. AS I ROLLED OUT; I SAW AN UNANNOUNCED WHITE SINGLE ENG CESSNA AT MY 10 O'CLOCK AND VERY CLOSE. I ROLLED R AND THE CESSNA WENT SLIGHTLY BELOW AND SLIGHTLY L OF MY ACFT. TWR HAD ADVISED US OF ANOTHER ACFT; WHICH WE WERE WATCHING. HOWEVER; THE SINGLE ENG CESSNA WAS NOT ANNOUNCED BY TWR. VISIBILITY WAS EXCELLENT. THE SINGLE ENG CESSNA WAS IN A DSCNT. WE WERE IN A CLB CLRING TERRAIN AND WATCHING OTHER ANNOUNCED TFC. I DO NOT KNOW IF THE SINGLE ENG CESSNA SAW ME. THE CHK PLT CALLED EAGLE TWR AND CONFIRMED WE WOULD FILE A FORMAL RPT AFTER OUR FLT. SUPPLEMENTAL INFO FROM ACN 412612: WHILE VERIFYING THE TKOF/CLB CHKS WERE COMPLETED; I HEARD AN EXCLAMATION FROM THE PF (IN THE L SEAT). AS I LOOKED UP; I SAW THE L WINDSCREEN FILLED WITH THE SIGHT OF ANOTHER ACFT IN EXTREMELY CLOSE PROX WITH A COLLISION APPEARING IMMINENT. THE PF WAS ALREADY ROLLING THE ACFT TO THE R WITH FULL CTL TRAVEL. THE COLLISION WAS AVOIDED AND THE PF RETURNED THE ACFT TO THE PREVIOUS HDG OF 215 DEGS. THE KING AIR THAT WE HAD BEEN ADVISED ABOUT WAS SIGHTED IMMEDIATELY AFTER THE NMAC; IT WAS WELL CLR OF OUR ACFT AND NO FACTOR AT THAT TIME. I RPTED THE NMAC TO THE TWR. THE CTLR ACKNOWLEDGED THE RPT AND THEN CONTACTED THE KING AIR TO ADVISE OF A SINGLE ENG CESSNA 100 FT BELOW THE KING AIR. RELEVANT FACTORS: NON RADAR ENVIRONMENT. ELEVATED WORKLOAD PERIOD. MOUNTAINOUS TERRAIN. TWR ADVISED US OF ONLY ONE INBOUND ACFT. POTENTIALLY CONFUSING ATC INSTRUCTIONS TO ARRIVING SE ACFT -- A LATER TELEPHONE CONVERSATION WITH TWR CTLR INDICATED THAT THE PLT OF THE OTHER ACFT HAD BEEN INSTRUCTED TO RPT ENTERING A MIDFIELD R DOWNWIND IN THE TFC PATTERN. THE TERRAIN AND DIRECTION OF FLT WOULD MAKE THIS A DIFFICULT TASK TO COMPLETE (WITHOUT XING THE DEP CORRIDOR) UNLESS THE PLT WAS FAMILIAR WITH THE ARPT AND ATC PROCS AT EGE.