NTSB Identification: DCA84IA001B.
The docket is stored on NTSB microfiche number 29186.
Incident occurred Sunday, September 30, 1984 in AKRON, OH
Aircraft: CESSNA 310J, registration: N3057L
Injuries: 47 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 BOEING VC-137B-BN, USAF #58-6971, OPERATING AS AIR FORCE 2 (AF-2), DEPARTED CLEVELAND, OH, AT ABOUT 1745 EDT ON AN IFR CLEARANCE. AFTER DEPARTING CLEVELAND, AF-2 WAS ASSIGNED AN ALT OF 8000 FT MSL BY CLEVELAND DEPARTURE CONTROL & WAS TRANSFERED TO CLEVELAND ARTCC. ON INITIAL CONTACT WITH CLEVELAND ARTCC, AF-2 WAS CLEARED TO CLIMB TO FLT LEVEL 230. A CESSNA 310J, N3057L, WAS CRUISING IN THE SAME VICINITY ON AN IFR CLEARANCE AT 13,000 FT & WAS ALSO UNDER CONTROL OF CLEVELAND ARTCC. AS AF-2 WAS CLIMBING THRU 12,200 ARTCC'S ATC COMPUTER CONFLICT ALERT FUNCTION WAS ACTIVATED FOR BOTH ACFT, ALERTING THE CONTROLLER OF A PENDING LOSS OF REQUIRED SEPARATION. THE CONTROLLER INSTRUCTED AF-2 TO MAINTAIN 12,000 FT. AF-2 ACKNOWLEDGED. HOWEVER, AF-2 REACHED APRX 13,000 FT BEFORE STARTING DESCENT & SEPN CONTDDECREASING. RDAR DATA SHOWED A MIN SLANT RANGE DIST OF 1/4 MI WITH600 FT VRT SEPN. THIS CONSTITUTED AND ATC OPERATIONAL ERROR INVOLVING LESS THAN STANDARD SEPN. THE ACFT WERE IN IMC & NONE OF THE PLTS SAW THE CONFLICTING TRAFFIC
The National Transportation Safety Board determines the probable cause(s) of this incident to be:IFR SEPARATION STANDARDS..NOT MAINTAINED..ATC PERSONNEL(ARTCC)
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