What was found
AS THE AMPHIBIOUS FLOAT EQUIPPED ACFT CONDUCTED ITS LANDING APPROACH, THE PILOT ATTEMPTED TO EXTEND THE LG. BOTH MLG EXTENDED & BOTH NLG REMAINED RETRACTED. THE PILOT THEN ATTEMPTED TO RETRACT THE MLG & THEY REMAINED EXTENDED. THE ACFT LANDED ON THE RUNWAY ON BOTH MLG & THE FLOATS. THE ACFT SUSTAINED DAMAGE TO THE RUB STRIP & THE OUTER SKIN ON THE LT FLOAT. INSPECTION REVEALED THAT THE SHAFT SEAL O RING ON THE RT MLG ACTUATOR WAS DAMAGED, ALLOWING LOSS OF HYD FLUID. THE PLUG THAT HOLDS SAID O RING WAS CORRODED, WHICH MAY HAVE CONTRIBUTED TO THE DAMAGED O RING. NEITHER THE TOTAL TIME IN SERVICE OF THE ACTUATOR NOR THE TOTAL TIME SINCE DISASSEMBLY & RE SEAL OF THE ACTUATOR COULD BE DETERMINED.