NTSB Identification: MKC84LA274.
The docket is stored on NTSB microfiche number 25348.
Nonscheduled 14 CFR
Accident occurred Monday, September 10, 1984 in CHESTERFIELD, MO
Aircraft: Gates Learjet LR-24D, registration: N45AJ
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.

THE ACFT WAS LANDED IN A THUNDERSTORM WITH A 16 KT LEFT QUARTERING TAILWIND. THE PLT WAS AWARE OF AN AREA ON THE RWY WHICH TENDED TO COLLECT WATER BUT DUE TO HEAVY PRECIPITATION THIS AREA COULD NOT BE VIEWED FROM THE COCKPIT. THE LEFT MAIN GEAR HYDROPLANED AS IT CONTACTED THIS AREA DURING THE LANDING ROLL RESULTING IN A 90 DEG RIGHT TURN. THE ACFT DEPARTED THE RIGHT SIDE OF THE RWY TRAVELING INTO ROUGH TERRAIN AT WHICH TIME THE LEFT MAIN GEAR PUNCTURED THE WING. HYDROPLANE MARKS WERE VISIBLE ON BOTH LEFT MAIN GEAR TIRES AFTER THE ACCIDENT.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

WEATHER CONDITION..UNFAVORABLE WIND




Contributing Factors

WEATHER CONDITION..RAIN


Contributing Factors

VISUAL LOOKOUT..REDUCED..PILOT IN COMMAND


Contributing Factors

AIRPORT FACILITIES,RUNWAY/LANDING AREA CONDITION..WET


Contributing Factors

AIRSPEED..EXCESSIVE..PILOT IN COMMAND


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