NTSB Identification: LAX86MA151B
Incident occurred Saturday, March 22, 1986 in CINCINNATI, OH
Aircraft: LTV A-7 (4 ACFT), registration: AFNG
Injuries: 152 Uninjured.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

INDIANAPOLIS CTR (CTLR-A) CLRD SLUFF 11 (S-11), A FLT OF 4 ANG A-7'S, TO CLB TO FL210. LATER, CTLR-A TOLD S-11 TO CHG FREQ (TO YORK LOW SECTOR, CTLR-B). S-11 CHGD FREQ, BUT NEITHER S-11 NOR CTLR-B ESTABLISHED RDO CONTACT WITH EACH OTHER UNTIL S-11 HAD CONTD INTO THE RICHMOND SECTOR (CTLR C'S AREA). ANOTHER FLT, SLUFF 31 (S-31), CANCELED IFR CLNC WITH CTLR-C; HOWEVER, CTLR-C (A DEVELOPMENTAL CTLR) BCM CONFUSED WITH THE SIMILAR CALL SIGNS & INADVERTENTLY ENTERED A CANCELLATION NOTE ON THE COMPUTER STRIP FOR S-11; HIS INSTRUCTOR DID NOT NOTE THE ERROR. THE STRIP WAS HANDED TO THE D-SIDE CTLR, WHO QUESTIONED THE NOTATION, BUT ENTERED A CANCELLATION MESSAGE IN THE COMPUTER, THUS REPLACING THE FULL DATA BLK FOR S-11 WITH A LIMITED DATA BLK. SVRL MIN LATER, S-11 CONVERGED WITH A BOEING 727 (TWA FLT 489) THAT HAD BEEN CLRD TO CLB TO FL230. SUBSEQUENTLY, THE FLTS PASSED W/I AN ESTIMATED 500' VERTICALLY & 200' LATERALLY OF EACH OTHER. THE FLT LEADER OF SLUFF 11 WAS ON A CHECK FLT & WAS BEING EVALUATED BY A STAN/EVAL INSTRUCTOR PLT (SLUFF 12).

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

INSTRUCTIONS,WRITTEN/VERBAL..NOT FOLLOWED..PILOT IN COMMAND

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

RADIO COMMUNICATIONS..DELAYED..PILOT IN COMMAND

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

SUPERVISION..INADEQUATE..CHECK PILOT

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

IDENTIFICATION OF AIRCRAFT ON RADAR..NOT MAINTAINED..ATC PERSONNEL(ARTCC)

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

ARTCC SERVICE..INADEQUATE..ATC PERSONNEL(ARTCC)

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

IFR SEPARATION STANDARDS..NOT MAINTAINED

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