ADAK, AK, USA
CGCPJ
MCDONNELL DOUGLAS DC-10
N832
BOEING 727
A CANADIAN PACIFIC MCDONNELL DOUGLAS DC-10 (FLT 3), CG-CPJ, & A REEVE ALEUTIAN BOEING 727 (FLT 724), N832, WERE CLRD TO FLY AT FL 290 ON 2 DIFFERENT AIRWAYS. THE AIRWAYS CROSSED AT PICUM INTXN, OVR THE BEARING SEA. WHILE TRAVELING IN NRLY OPPOSITE DRCTNS AT THE SAME ALT, THE 2 ACFT PASSED W/I APRX 1/2 MI OF EACH OTHER, WHERE THE AIRWAYS CROSSED AT PICUM. THE DC-10 CREW SAW THE B-727, BUT THE B-727 CREW DID NOT SEE THE DC-10. PICUM INTXN WAS LOCATED IN AN AREA THAT WAS BYD NORMAL RADIO & RADAR RANGE OF THE ATC CONTROLLERS (CTLRS). THE 2 ON DUTY CTLRS HAD COMBINED SECTORS 10 & 11, THEN HAD DIVIDED THE 2 SECTORS IN A NORTH/SOUTH CONFIGURATION, WHICH WAS CONTRARY TO SOP. THE INCIDENT OCCURRED DRG A BUSY TIME. THE SUPVR WAS HELPING 1 OF THE 2 CTLRS. THE CTLR, WHO WAS HNDLG FLT 3, CLRD IT TO DSCND FM FL 330 TO FL 290 & SAID HE TOLD THE OTHER CTLR TO STOP FLT 724 AT FL 280, WHEN FLT 724 WAS CLIMBING FM A LWR ALT. THE CTLR, WHO WAS HNDLG FLT 724, STATED THAT HE DID NOT KNOW THERE WAS AN ACFT AT FL 290 WHEN HE CLRD FLT 724 TO FL 290.
Source: NTSB Aviation Accident Database
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