There were two certified mechanics, one being the supervisor, who were employed by an aircraft repair business located at the small local airport. While working on a plane, the mechanic took a personal cell phone call. The distraction of the call caused the mechanic to fail to complete a task properly. Because the supervisor was "busy", he signed off on the repairs without checking the mechanic's work. The next day, the pilot takes off. The engine quickly malfunctions causing it to crash critically injuring the pilot. After investigating the crash, the NTSB (National Transportation Safety Board) issued a report stating that the improperly completed task (caused by the cell phone distraction) was the cause of the accident. Briefly describe who can be held responsible for the pilot's injuries and the damage to the plane.