An aircraft 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 sheet for the subject aircraft that includes; type, registration number, serial number, hours flown, cycles flown, times and cycles to major checks, engines installed with details, apu installed and information on other major 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 aircraft should be a full on site appraisal.  This includes a complete logbook and maintenance records review, along with a status check on all Airworthiness Directives and Service Bulletins. The physical condition of both the interior and exterior should be noted and any deficiencies clearly noted.