An engine appraisal starts with a complete description of the workscope, which includes the purpose of the appraisal and if an onsite visit is required.  For a desktop appraisal the client normally provides a detailed specification disk sheet for the subject engine that includes; type, serial number, hours flown, cycles flown, times and cycles to major checks and information on other major quick engine change (QEC) components.  Many assumptions are made during a desktop appraisal that can significantly impact the values returned.

It is the opinion of Zeus AV that every initial appraisal for an engine should be a full on site appraisal.  This includes a complete maintenance records review, along with a status check on all Airworthiness Directives and Service Bulletins. The physical condition of the engine can also be reviewed via boroscope for interior engine damage and any deficiencies clearly noted.