Montabaur , Germany ( CNN ) Co-pilot Andreas Lubitz 's voice is n't heard in a recording of the final moments of Germanwings Flight 9525 . But investigators say he was the one at the controls inside the cockpit , deliberately locking out the plane 's captain and setting the plane on a crash course for the French Alps . Andreas Lubitz had medical note for day of crash , hid illness , officials say . The only sound the recorder picked up from Lubitz as the Airbus A320 went down , Marseille prosecutor Brice Robin said , was the co-pilot 's steady breathing . Authorities did n't mince words Thursday as they blamed Lubitz for the crash , but questions are still swirling over the 27-year-old 's past . Officials say Lubitz passed a psychological test when he was hired , had no known ties to terrorism and showed no sign of medical distress during the flight . It seems , Robin said , that Lubitz `` wanted to destroy the aircraft . '' But why ? Lufthansa CEO 'speechless ' It 's a question police were trying to answer as they searched Lubitz 's apartment in Dusseldorf . Police spokesman Markus Niesczery said a team of five investigators went `` through the apartment looking for clues as to what the co-pilot 's motivation might have been , if he did indeed bring the plane down . '' About 85 miles ( 136 km ) away in the town of Montabaur , the house where Lubitz 's parents live was shuttered and guarded by police . A group of men , perhaps investigators , were the only ones granted access . This town in western Germany is where Lubitz pursued his love of flying from a young age . At a club on the outskirts of Montabaur , pilots who knew Lubitz said they were shocked to hear what investigators said . They said the man they know never would have deliberately crashed a plane . Between the ages of 14 and 20 , Lubitz was a regular fixture at the gliding club . `` ( He was ) a very normal young person , full of energy , '' Klaus Radke said . `` What can I say ? He had a bright future . He made his hobby into his job . What more can you hope to achieve ? '' The authorities ' explanation does n't ring true for Peter Ruecker , another pilot who knew him from the flight club . `` Knowing Andreas , this is just inconceivable for me , '' Ruecker told the Reuters news agency . `` He was a lot of fun , even though he was perhaps sometimes a bit quiet , '' Ruecker said . `` He was just another boy , like so many others here . '' A neighbor told Reuters that Lubitz `` was very interested in things which are going on around him . '' `` It 's a very good family , '' the neighbor said . `` They have a good connection within the family and they are engaged in the community . '' An 8-minute descent to death . Lubitz had been with Germanwings , a budget airline owned by Lufthansa , since September 2013 and had completed 630 hours of flight time , the airline 's media office said . Lufthansa CEO Carsten Spohr told reporters that Lubitz `` interrupted '' his training , which he began in 2008 . That break lasted several months , he said , but added that such an interruption is n't uncommon . Spohr said he could n't give any information about why the co-pilot had stopped and then restarted his training . If it was for medical reasons , he said , then that information would have been private before the crash , he said , but it will be part of information gathered during the investigation . Most of Lubitz 's training took place at the Lufthansa flight training center in Bremen . He also trained in the United States , spending six months at facility in Arizona as part of a required program to get his license , a Lufthansa spokesperson said . Spohr said Lufthansa pilots get medical testing but do not undergo regular or routine psychological testing once they are flying . However , the airline does consider an applicant 's psychological state , along with other factors , when hiring pilots , he said . Lubitz and the captain passed a psychological test when they were hired , he said . `` We do n't only look at competence but we also give a lot of room to psychological capabilities , '' Spohr said . `` He was 100 % set to fly without restrictions , '' he added . `` His flight performance was perfect . There was nothing to worry about . '' Students , singers among the victims . 5 cases of pilots intentionally crashing . Diana Magnay reported from Montabaur . Catherine E. Shoichet and Ashley Fantz reported from Atlanta . CNN 's Fred Pleitgen contributed to this report from Cologne , Germany . CNN 's Mark Thompson , Eliott C. McLaughlin Laura Smith-Spark , Bharati Naik and Sara Sidner also contributed to this report .
Police search co-pilot Andreas Brice Robin 's apartment for clues . A pilot who knew Brice Robin calls him a `` very normal young person '' Investigators say they believe he deliberately crashed Germanwings Flight 9525 .