NTSB Identification: CHI82FA098
14 CFR Part 91: General Aviation
Accident occurred Tuesday, March 23, 1982 in KALAMAZOO, MI
Probable Cause Approval Date: 03/23/1983
Aircraft: BEECH 65-A90, registration: N6069C
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLT HEARD A GRINDING NOISE WHEN HE ATTEMPTED TO LOWER THE LANDING GEAR. THE GEAR WOULD NOT EXTEND WITH EITHER THE NORMAL OR EMERGENCY SYSTEMS. THE ACFT LANDED WITH THE GEAR IN THE PARTIALLY EXTENDED POSITION. SUBSEQUENT TO EXAMINATIONOF THE NOSE LANDING GEAR ACTUATOR BY THE MANUFACTURER, THE GEAR BOX FOR THE NOSE GEAR ACTUATOR WAS DISASSEMBLED. IT WAS STILL PACKED WITH GREASE. WHILE REMOVING THE MASS OF GREASE FROM AROUND THE DRIVE PINION GEAR, A SMALL NUT, FOREIGN TO THE INSIDE OF THE GEAR BOX, WAS FOUND BURIED, AND INVISIBLE, IN THE GREASE THAT WAS PACKED AROUND THE BEVELED GEARS. EXAMINATION OF THE NUT SHOWED INDENTATIONS OF TWO OPPOSITE SIDES. PLACEMENT OF THE NUT ON EITHER SIDE OF THE POINT WHEREBOTH BEVELED GEARS MET WOULD JAM THE ROTATION IN EITHER THE RETRACT OF EXTEND CYCLE. ON 12/23/77 THE GEAR ACTUATORS WEREREPLACED WITH REBUILT PARTS.

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

LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..JAMMED


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