There is no set amount here. I have heard 25% off total price for
missing logs (totally missing). There is something in the FARS about
re-creating lost logs. That is what I would do if I owned the plane.
Just create a log for each invoice or something similar. Sign it off as
"recreated log". Better than nothing. I guess I'd argue for 25% of the
value remaining on the engine until TBO? So if the engine is 50% to
TBO, and a zero time is 40k, then 5k off. (25% of 20k)?