After the last passengers and baggage are loaded onto the aircraft, the pilot in command is given a form called load & trimsheet which shows the passenger/baggage distributions, total weights and cg positions. The form can be prepared manually or by a computer program by the authorized ground staff. This form has the wet signature of the ground crew coordinating the flight and the pilot in command on it and these signatures ensure that the form is legal.
My question is about the process of sending this legal form to the cockpit of the aircraft via ACARS. When the form is transmitted to the aircraft via ACARS, is it still considered to be a legal document without wet signature on the form?
How is this process run by airlines?