FARMINGTON, NM, USA
N6205X
CESSNA 421C
WHILE TAXIING AFTER LANDING, THE ACFT WAS IN A LEFT TURN WHEN THE RIGHT MAIN GEAR COLLAPSED. THE PLT REPORTED THAT ALL 3 GEAR INDICATED DOWN & LOCK, BOTH BEFORE & AFTER THE MISHAP. AN EXAM OF THE RIGHT MAIN GEAR ACTUATOR, PN 9910136-4, REVEALED THAT CONTAMINATION HAD COLLECTED ON THE INNER CYLINDER WALL & PREVENTED THE KEYS FROM PROPERLY EXTENDING TO THE LOCKED POSITION. ALSO, THE GEAR SYS WAS DESIGNED TO MAINTAIN HYDRAULIC PRESSURE ON THE DOWN SIDE OF THE ACTUATOR WHEN IT WAS EXTENDED. HOWEVER, THE CONTAMINANT ALSO PREVENTED THE SWITCH (IN THE ACTUATOR) FROM OPERATING PROPERLY.
Source: NTSB Aviation Accident Database
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