A hull loss is an aviation accident that damages the aircraft beyond economical repair, resulting in a total loss. The term also applies to situations in which the aircraft are missing, the search for their wreckage is terminated or when the wreckage is completely inaccessible.
"Hull losses per 100,000 flight departures" has been a long-used statistical criterion. From 1959 to 2006, the first part of the mainstream jet aircraft era, 384 of 835 hull losses, or 46%, were nonfatal. Airlines typically buy insurance to cover hull loss on a twelve-month basis. Before the September 11 attacks in 2001, the typical insured sum for a hull loss policy could reach $250 million. Since then demands for higher coverage have increased.
Constructive hull loss factors other incidental expenses beyond repair, such as salvage, logistical costs of repairing the non-airworthy aircraft within the confines of the incident site, recertifying the aircraft, and so forth. Insurance policies covering any asset that is subject to depreciation typically pay the insured a formulaic used item value, so the property will often be a write-off as full repairs plus this sum resemble a cost of a new replacement.