Pilot lot is more like prototype products manufactured and
inspected and validated.
If the output is a bunch of small products like caps, tooth
brushes. Pilot lot is the first batch of caps or brushes made and
validated. It will be inspected for all characteristics that the
customer need and will be shipped with first consignment to the
customer.
Pilot lot is also known as first article/ first batch. Customer
might also insist to make a pilot lot inspection to the supplier
when there is a change in drawing/specification in the order.