NTSB Identification: MIA87IA264B.
The docket is stored on NTSB microfiche number 35181.
Incident occurred Tuesday, September 29, 1987 in HAMPTON, NY
Probable Cause Approval Date: 11/15/1989
Aircraft: LOCKHEED C-141, registration: USAF
Injuries: 97 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

A FULL PERFORMANCE LEVEL CONTROLLER (FPL CTLR) AT SECTOR 31 OF BOSTON ARTCC WAS GIVING FAMILIARIZATION TRAINING TO ANOTHER FPL CTLR TO FAMILIARIZE THE TRAINEE WITH A NEW AREA THAT HAD BEEN TRANSFERRED FROM NEW YORK ARTCC TO BOSTON ARTCC. SECTOR 31 WAS CONSIDERED TO BE A RATHER COMPLEX & BUSY AREA. DURING A BUSY PERIOD AFTER TRAFFIC HAD 'PEAKED', THE CTLRS WERE CONCENTRATING ON A POTENTIAL CONFLICT BETWEEN 2 ACFT WHEN ONE OF THEM (EASTERN FLT 380, A BOEING 727) BEGAN CONVERGING WITH A 3RD ACFT (MAC 67947, A USAF C-141). THE CONFLICT ALERT SYSTEM ACTIVATED & THE CTLRS ISSUED A TURN TO AVOID CONVERGENCE; HOWEVER, THE 2 ACFT PASSED WITHIN 1/2 MI OF EACH OTHER WITH THE SAME ALTITUDE ASSIGNMENT. EA380 HAD BEEN ASSIGNED AN ABNORMALLY LOW ALTITUDE (FL230) FOR ITS ROUTING. THE CONFLICT OCCURRED WHEN EA380 TURNED IN RESPONSE TO AN ARTCC CLEARANCE.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

IFR SEPARATION STANDARDS..NOT MAINTAINED..ATC PERSONNEL(ARTCC)


Contributing Factors

LIGHT CONDITION..DUSK


Contributing Factors

LACK OF FAMILIARITY WITH GEOGRAPHIC AREA..ATC PERSONNEL(ARTCC)

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