NTSB Identification: DEN88IA072B
Incident occurred Tuesday, February 16, 1988 in DENVER, CO
Probable Cause Approval Date: 07/18/1990
Aircraft: CESSNA 441, registration: N1WB
Injuries: 16 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.

AS ROCKY MTN AIRWAY FLT 2129 (DE HAVILLAND DH-7, N9058P) & CESSNA 441, N1WB, WERE ARRIVING, THERE WAS MODERATE TO HVY TRAFFIC & A RWY CHANGE WAS IN PROGRESS. N1WB & FLT 2129 WERE PROVIDED INITIAL SEQUENCING BY FEEDER CTLRS (AR-1 & AR-4). BOTH FLTS WERE HANDED OFF TO THE FINAL CTLR (AR-2), WHO WAS RESPONSIBLE FOR ESTABLISHING ARRIVAL SEQUENCE. AR-2 WAS A DEVELOPMENTAL CTLR, WHO HAD JUST BEGUN TRAINING IN THAT POSITION. N1WB & FLT 2129 WERE VECTORED FOR SIMULTANEOUS IFR APCHS TO RWYS 17L & 18. AS THE TWO ACFT WERE ON THEIR RESPECTIVE FINAL APCHS, MINIMUM SEPARATION STANDARD WAS LOST. WHEN THE LOCAL CTLR DETERMINED THE ERROR, HE ISSUED INSTRUCTIONS TO CORRECT THE SITUATION.

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

IFR SEPARATION STANDARDS..NOT MAINTAINED..ATC PERSONNEL(DEP/APCH)

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