NTSB Identification: NYC91LA043.
The docket is stored on NTSB microfiche number 44980.
Accident occurred Wednesday, December 05, 1990 in NEW HAVEN, CT
Probable Cause Approval Date: 05/15/1992
Aircraft: CESSNA 210L, registration: N5280V
Injuries: 4 Minor.

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

DRG FLT, THE PLT NOTED A NEGATIVE READING ON THE AMMETER & CYCLED THE ALTERNATOR SW, BUT TO NO AVAIL. BEFORE LNDG, SHE ACTIVATED THE RWY LGTS & DISCUSSED THE WNDS WITH A DEPG PLT. A COMPLETE ELEC FAILURE OF THE ACFT OCCURRED AS IT WAS ON DOWNWIND TO LND AFTER THE TWR HAD CLOSED. CONSEQUENTLY, ALL EXTERNAL LGTG & COM RADIO IN THE ACFT WERE INOP. A VEHICLE DRIVER WAS MAKING A RQRD INSPN ON RWY 32. THE DRIVER SAID SHE MONITORED THE TWR FREQ USING A HAND HELD RADIO & HEARD A DISCUSION, BUT DIDN'T HEAR EXACTLY WHAT WAS SAID. SHE SAW THE RWY LIGHTS ILLUMINATE, BUT THOUGHT THEY WERE ACTVTD BY THE DEPG ACFT. SHE ANNOUNCED HER FLD PSN & INTENTIONS USING THE GND CTL FREQ. THE PLT LNDD THE ACFT ON RWY 20 & BGN THE ROLLOUT AS THE VEHICLE DRIVER WAS ON RWY 32, CROSSING RWY 20. SUBSEQUENTLY, THE ACFT & VEHICLE COLLIDED AT THE RWY INTXN. THE ACFT'S ALTERNATOR & VOLTAGE REGULATOR WERE REMOVED & TESTED, BUT BOTH WERE FND TO BE OPNL. THE OVERVOLTAGE UNIT WAS NOT RECOVERED & THE REASON FOR THE LOSS OF ELEC PWR WAS NOT VERIFIED.

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

THE FAILURE OF THE VEHICLE DRIVER TO ADEQUATELY MONITOR THE RADIO/TRAFFIC PATTERN. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS, THE AIRCRAFT'S LOSS OF ELECTRICAL POWER AFTER ACTIVATING THE RUNWAY LIGHTS AND ENTERING THE PATTERN, AND THE LACK OF VISUAL PERCEPTION CONCERNING BOTH THE VEHICLE DRIVER AND THE PILOT.

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