Chek Lap Kok carries out security review after the man was found dead in the undercarriage Sweeping security checks were carried out at Chek Lap Kok yesterday after the body of a young stowaway was found in Tokyo in the wheel compartment of a passenger plane from Hong Kong. A ground crew member found the Asian man, believed to be in his 20s, on an All Nippon Airways (ANA) plane, which left Hong Kong on Tuesday night. The man's body was only found after the Japanese ground crew opened the Boeing B777's undercarriage compartment as part of maintenance carried out every 500 flying hours. 'Some parts of the body were decaying,' said a spokesman for Japan's Narita International Airport police. 'We cannot identify him because he had neither a passport nor an ID card.' A Hong Kong police source said the man was heavily clothed, adding that the compartment he was found in was not visible from the ground. A post-mortem examination is under way to determine how and when the man died. 'This will help to identify where and when he stowed away on the plane,' the police source said. 'But early indications are pointing to Shanghai.' The Hong Kong Airport Authority and airport police yesterday ordered a review of security procedures after they learned of the discovery. 'How, when and where he boarded the plane is still a mystery,' said authority spokesman Chris Donnolley. 'We have no idea how long his body may have been hidden in the compartment, but we are extremely confident that he did not get on the plane in Hong Kong.' Flight NH910 left Hong Kong on Tuesday afternoon after stopping over for about one hour and 40 minutes. The aircraft had previously made stops in Singapore and Shanghai. On January 23, two Turkish stowaways plunged from an Air France plane as it approached Shanghai, crashing through the roof of a small house. It is understood the two were actually trying to fly to Germany but stowed away on the wrong flight out of Paris. Their bodies fell from flight AF112 when the landing gear was unlocked. ANA could not be contacted for comment last night. After an exhaustive review, the Airport Authority moved to allay concern about airport security. 'People might be concerned there may have been a security breach,' said Mr Donnolley. 'We have examined our procedures and are confident security is as good as it has ever been. 'It is very difficult to get on to the airfield here, the security is just so tight.' During the stop-over in Hong Kong, the aircraft was guarded by the Aviation Security Company, he said. Following the notification by ANA, the Airport Authority checked with all of the airline's service providers and confirmed no staff were reported missing. 'There was a recent incident where a cargo loader on an aircraft flying out of Anchorage in Alaska fell asleep while loading a plane,' said Mr Donnolley. 'Apparently he woke up when the plane was half-way across the Pacific.' It is impossible for humans to fly in the undercarriage of an aircraft for long periods without risking death by exposure or suffocation from a lack of oxygen at 35,000 feet, an airliner's normal cruising altitude.