All exchange prices are quoted based on receipt of an acceptable core within 15 calendar days from invoice date. Acceptable cores are defined as same part numbered units identically configured and equivalent in mod status to those provided on exchange. Cores are to be normal removals and not subjects of severe stress or heat as in major engine failure, fire, crash, water submersion, cannibalization, bearing failure, long start, abnormal wear, etc. If the return unit is found beyond economical repair, the lesser of the pre-determined BER price and outright price would apply, depending on specific program. For exchange programs that accept competitor cores and/or BER cores, those units must be complete uncanniballized non-incident cores as removed from a flying aircraft with data plate included. Units must be like replacements from same aircraft application. Cores may have been determined BER by prior inspection, but for all programs cores must contain all original parts with no unapproved parts installed. StarterGenerator.com® may consider alternate manufacturer units and those with similar part number but equal or greater core value, as acceptable cores. Call to verify acceptance before returning these particular units. In some cases, upfront core deposit may be required.