The co-pilot of the China Airlines plane that crashed on landing at Chek Lap Kok in August, killing three people, flew a jet into Hong Kong yesterday on his first flight since the accident. Passengers on the flight were surprised to learn he had been at the controls. Flying from Taipei, co-pilot Liu Cheng-hsi, 36, touched down safely at 2.30pm for a brief stopover en route to Kuala Lumpur as part of tests to see if he requires more training. Mr Liu and Italian pilot Captain Gerardo Lettich, 58, were in the cockpit when their MD-11 crashed on August 22, killing three and injuring more than 200 passengers and crew. Mr Liu underwent retraining after having a two-month rest and landed yesterday with a supervising pilot. A Taiwanese passenger, in her 20s, was alarmed to hear Mr Liu had piloted her plane and that it was his first since the crash. But she said the flight had been routine. Another passenger, Thomas Lee, on his way to the mainland, said he was not bothered that Mr Liu was at the controls. A British passenger said: 'I'm not worried.'. Last month, Taiwan's Civil Aeronautics Administration gave Mr Liu the all-clear to start flying again, saying investigations had yet to suggest pilot error caused the crash. Mr Liu acted as first officer on the return leg to Taipei.