What was found
WHILE PERFORMING A 100-HR INSPECTION, MAIN GEARBOX CHIP DETECTOR WAS REMOVED. CHIP DETECTOR FOUND WITH EXCESSIVE AMOUNTS OF SLUDGE BUILD-UP. A FUNCTIONAL CHECK VERIFIED A CHIP WOULD NOT COMPLETE THE CIRCUIT. AFTER CLEANING CHIP DETECTOR, NO FURTHER DISCREPANCIES NOTED. TT 190.0 HRS SINCE LAST CLEANING AND FUNCTIONAL CHECK ON CHIP DETECTOR. SUBMITTER RECOMMENDS A 100-HR CLEANING AND FUNCTIONAL CHECK ON CHIP DETECTOR ALONG WITH ANNUAL GEARBOX OIL CHANGE. THE ROBINSON R22 MAIN TRANSMISSION CHIP DETECTOR IS NOT EASILY ACCESSED. MOST AIRCRAFT AND ROTORCRAFT CHIP DETECTORS ARE OF A QUICK DISCONNECT TYPE. SUBMITTER WOULD REQUEST A CHANGE IN DESIGN TO THE R22 TO INSTALL THE QUICK DISCONNECT TYPE CHIP DETECTOR.