One passenger died Death immediately and three more died Death within a week , as did the co-pilot , C. T. Owens .

Swiss authorities also blamed Judgment_communication inadequate Crew Resource Management experienced Change_sentiment when the pilot vetoed Statement the co-pilot ’ s attempted go-around , along with the absence of lighting Lighting on Stadlerberg Mountain and the Drum Pointer Altimeter of the aircraft .

The investigation determined Deciding that the crash was caused Causation deliberately by the co-pilot , Andreas Lubitz , who had previously been treated Cure for suicidal tendencies and declared Expressing_publicly `` unfit to work '' by his doctor .

In response Response to the incident and the circumstances of the co-pilot 's involvement , aviation authorities in some countries implemented Action new regulations that require Imposing_obligation the presence of two authorized Preventing_or_letting personnel in the cockpit at all times .

The co-pilot had completely lost Earnings_and_losses control Control of the aircraft but would not let Preventing_or_letting up on the controls Control so the pilot took Conquering matters back into his own hands and managed to get Getting the plane to a certain position to save Rescuing most of the passengers on board .

The co-pilot and two passengers survived the initial crash .

Of the 113 people on board , there were five survivors , including the co-pilot .

With him were Daniel W. Hennessy , 33 , of Hillsborough , California , as co-pilot , and Paul M. Entz , 37 , of North Hollywood , California , as flight Motion engineer .

It also cited Statement the captain 's heart condition and the limited experience of the co-pilot , while noting Statement an unspecified `` technical problem '' that the crew apparently resolved Resolve_problem before take-off Motion .

although the state of the wreckage prevented Preventing_or_letting investigators from definitively pinpointing Aiming the exact origin of the fire , an area of severe burning was found Know close to the unk fuel valve located in the cockpit between the pilot and co-pilot .