NTSB Identification: MIA91LA003.
The docket is stored on NTSB microfiche number 42425.
Accident occurred Tuesday, October 02, 1990 in TAMPA, FL
Probable Cause Approval Date: 10/02/1992
Aircraft: BEECH C-90, registration: N7128J
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.

DURING FLT BEFORE ACCIDENT FLT, THE LANDING GEAR MALFUNCTIONED. EMERGENCY GEAR EXTENSION WAS ACCOMPLISHED BUT REQUIRED EXCESSIVE FORCE. MAINTENANCE PERSONNEL LUBRICATED THE NOSE GEAR RETRACT CHAIN & ADJUSTED THE GEAR DOWN LIGHT INDICATOR SWITCH. THE AIRPLANE WAS FLOWN WITH NO DISCREPANCIES NOTED. THE ACCIDENT FLT WAS UNEVENTFUL UNTIL AFTER LOWERING THE LANDING GEAR SELECTOR HANDLE, THE GEAR DID NOT FULLY EXTEND. THE EMERGENCY METHOD WAS UNSUCCESSFUL. THE MAIN GEAR COLLAPSED DURING THE LANDING ROLL. EXAM OF THE LANDING GEAR SYSTEM REVEALED THAT THE NOSE GEAR ACTUATOR WAS SEIZED DUE TO LACK OF LUBRICATION. THE ACFT LOGBOOKS INDICATE THAT ALL GEAR ACTUATORS WERE REPLACED ON 8-23-86. THERE WERE NO FURTHER ENTRIES INDICATING THAT THEY WERE LUBRICATED. ACCORDING TO THE MAINT MANUAL, THE ACTUATORS SHOULD BE REMOVED FOR LUBRICATION EVERY 1,000 CYCLES OF OPERATION OR 30 MOS., WHICHEVER OCCURS FIRST. THE ACFT ACCUMULATED 3,154 CYCLES SINCE REPLACEMENT OF THE ACTUATORS.

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

THE LACK OF LUBRICATION BY MAINTENANCE PERSONNEL OF THE NOSE LANDING GEAR ACTUATOR.

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