Pilot Gerardo Lettich has returned to his home in Italy as investigations into the China Airlines crash at Chek Lap Kok airport continue. The 58-year-old captain told the crash investigation team and the airline of his location and is in contact with them from his home in Rome. Captain Lettich returned home on Friday, the day after he refused to comment on the crash when tracked down at his hotel room by the South China Morning Post. Co-pilot Liu Cheng-hsi, 36, has returned to his home in Taiwan. Both men have been suspended from flying pending the outcome of the investigation. Taiwan's Civil Aeronautics Administration has hinted at possible communications problems on the flight deck before the crash. China Airlines spokesman Charles Chen said Captain Lettich's employers, Dublin-based Irish company PARC Aviation, told them where he was. He said: 'If either of them are needed in Hong Kong they can come back.' Alice Chan of the Civil Aviation Department said: 'We interviewed him after the accident. He is not being detained and is at liberty to go where he wants. When we need him we will contact him.'