What was found
THIS IS IN RESPONSE TO SIAB 2023-01. MR SPINDLE BEARINGS WERE FOUND TO HAVE SIGNS OF BRINELLING AFTER ONLY 165 HOURS OF SERVICE, OR 5 MONTHS SINCE INSTALLATION. I DO NOT HAVE A SERIAL NUMBER FOR THESE BEARINGS BECAUSE THEY WERE INSTALLED AT ROBINSON AND THEY DON'T PROVIDE THAT INFORMATION WHEN YOU BUY BLADES. THIS HAPPENED A WHILE BACK BEFORE WE KNEW WHAT WAS GOING ON BUT IN HINDSIGHT WE BELIEVE THAT WE HAVE RECEIVED A BAD SET OF BEARINGS. GRANTED THE SHIP IS PRIMARILY USED FOR FLIGHT TRAINING BUT OUR PILOTS HAVE HAD A GOOD TRACK RECORD OF TELLING US WHEN AN OVERSPEED OCCURS. EVEN IF AN OVERSPEED OCCURS IT TAKES A LOT TO DAMAGE THOSE BEARINGS. USUALLY AN OVERSPEED OF ABOUT 112-114% WONT CAUSE ANY DAMAGE, 116% AND UP FOR MORE THAN A SECOND WOULD CAUSE SOME BRINELLING. BUT THE BEARINGS THAT I HAVE FELT IN THESE LAST TWO SETS WERE WORSE THAN THAT, AND I HAVE A HARD TIME BELIEVING THAT WE HAVE HAD THAT MAY OVERSPEEDS.