NTSB Identification: CHI87IA135.
The docket is stored on NTSB microfiche number 37673.
Scheduled 14 CFR AMERICAN AIRLINES
Incident occurred Friday, May 29, 1987 in CHICAGO, IL
Probable Cause Approval Date: 07/10/1989
Aircraft: MCDONNELL DOUGLAS DC-9-82, registration: N224AA
Injuries: 83 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.

AMERICAN FLT 637 WAS ON DEPARTURE FROM CHICAGO-O'HARE INTL ARPT (ORD), CLIMBING THRU 7300' MSL, WHEN IT PASSED AMERICAN FLT 393 WITH APRX 500' VERTICAL SEPN & 1/4 MI HORIZONTAL SEPN. THIS OCCURRED AFTER AN AIR TRAFFIC ASSISTANT, WHO WAS WORKING THE CLNC DELIVERY PSN AT ORD, HAD ISSUED THE SAME TRANSPONDER CODE TO FLT 637 & UNITED FLT 441. SUBSEQUENTLY, A TRAINEE CONTROLLER (CTLR), WHO WAS WORKING AT THE WEST DEPARTURE RADAR CONTROL POSITION, MISTOOK FLT 441'S TARGET AS THAT OF FLT 637 & ISSUED CLIMB INSTRUCTIONS TO FLT 637. THE INSTRUCTOR DID NOT RECOGNIZE THE ERROR IN TIME TO CORRECT THE CTLR'S ACTION.

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

ATC CLEARANCE..IMPROPER..ATC PERSONNEL(LCL/GND/CLNC)

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

IDENTIFICATION OF AIRCRAFT ON RADAR..IMPROPER..ATC PERSONNEL(DEP/APCH)


Contributing Factors

SUPERVISION..INADEQUATE..ATC PERSONNEL(SUPERVISOR)

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