NTSB Identification: CHI90LA018.
The docket is stored on NTSB microfiche number 39031.
Accident occurred Sunday, October 22, 1989 in LANSING, IL
Probable Cause Approval Date: 07/11/1990
Aircraft: BEECH A36, registration: N6736L
Injuries: 1 Uninjured.

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

WHILE ATTEMPTING TO TAXI FROM THE RUNWAY TO THE HANGAR/RAMP AREA AFTER LANDING, THE PLT TAXIED ACROSS A GRASSY AREA TO GET TO THE MARKED TEMPORARY GRASS TAXIWAY. AS HE TAXIED THROUGH THE GRASSY AREA, THE ACFT'S LEFT MAIN LANDING GEAR DROPPED INTO AN UNMARKED HOLE WHICH THE PLT ESTIMATED TO BE 23' DEEP. THE PLT WAS ABLE TO TAXI THE ACFT OUT OF THE HOLE BY USING POWER; HOWEVER SUBSTANTIAL DAMAGE RESULTED TO THE ACFT. THE ARPT WAS IN THE MIDST OF ONGOING CONSTRUCTION, AND THE HOLE WAS ONE OF SEVERAL CAUSED BY THE RELOCATION OF THE VASI LIGHT INSTALLATION DUE TO RUNWAY EXPANSION. THE AIRPORT MANAGEMENT STATED THAT THE HOLES HAD BEEN 'RESTORED' AFTER THE VASI STRUCTURES WERE REMOVED; THEY WERE 'RESTORED' AGAIN THE DAY AFTER THE ACCIDENT. THE PLT DESCRIBED THE LIGHT CONDITIONS AS 'DARK NIGHT' AT THE TIME OF THE ACCIDENT.

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

PILOT'S POOR JUDGEMENT IN ELECTING TO TAXI ACROSS AN UNMARKED AREA IN DARK NIGHT CONDITIONS, AT AN AIRPORT WITH KNOWN CONSTRUCTION IN PROGRESS AND THE AIRPORT MANAGEMENT'S FAILURE TO ASSURE THE INITIAL REPAIRS WERE SUFFICIENT TO CORRECT THE HOLES MADE DURING CONSTRUCTION.

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