Field service data is a category of data that is connected with field service calls where a repair technician manually repairs a failed product during an on-site visit. This is a potentially powerful source of field reliability information, as long as a system is in place to gather the necessary data during the service call. This paper presents the field data analysis of a turbo compressor. The failure rates of maintainable items and compressor system are estimated by analyzing the field data collected from the 282 systems shipped in the market from 2008 to 2016. They are also compared with the failure rates estimated by using OREDA(Offshore and Onshore Reliability Data).