Reliability Evaluation Automatic Flight Control System Actuator On Sikorksy S-76 C++ Helicopter At PT. Pelita Air Service

Abstract

The AFCS Actuator is a component of the Automatic Flight Control System installed on the Sikorsky S-76 C++ helicopter. This system functions as the helicopter control center. Failures that occur in flight control will certainly result in inconvenience for the pilot in operating the helicopter, even the movement of the helicopter can go out of control, causing an incident or accident. At PT Pelita Air Service there were 94 replacements for the AFCS Actuator components with Part Number 76900-01802-106 which were carried out in the period from 2012 to 2022. So that attention needs to be paid to maintaining reliability and function of the components remains good. After conducting a reliability analysis using the Weibull distribution, the MTTF of AFCS Pitch, Roll and Yaw Actuator was 2526 FH, 3248.761 FH, 1625.655 FH respectively and the failure rate on MTTF was 0.00043413 for Pitch Actuator, 0.000263 for Roll Actuator and 0.000875 for Yaw Actuator. Based on the FMEA analysis, corrective actions were obtained to increase component reliability, namely carrying out scheduled inspections on components with the main focus on the actuator rod end, connector on the actuator and tension cable to the tail rotor