Hong Kong Airlines Airbus A330-243 was en route to Denpasar, Bali, Indonesia in September 2019, but a machine failure occurred shortly after takeoff. It had to turn back to Hong Kong International Airport in an emergency, and the runway was closed for nearly two hours.
The Civil Aviation Accident Investigation Agency issued a serious accident investigation report today (8th), stating that the four connecting screws of one of the manual valves in the ground service conduit of the green hydraulic system failed due to metal fatigue, causing the valve to be completely separated and punctured the blue hydraulic system. the return pipe, causing an accident.
The passenger plane involved was Hong Kong Airlines flight HX707, an Airbus A330-243 passenger plane, which was originally scheduled to take nearly 300 passengers and crew to Denpasar, Bali, Indonesia on September 29, 2019.
The accident caused the plane to turn back on the same day and no one was injured
The accident investigation report pointed out that the passenger plane took off from the south runway of Hong Kong International Airport at 12:23 noon on the same day. When the passenger plane climbed to 3,460 feet above sea level, the electronic central aircraft monitor issued a warning and message, indicating that the green and blue hydraulic systems were not functioning properly. Pressure is lower.
The crew immediately turned back and made an emergency landing on the south runway of Hong Kong International Airport. The No. 5 tire of the passenger plane involved burst and finally stopped right in front of taxiway J3. No one was injured in the incident.
The No. 5 tire of the Hong Kong Airlines flight involved burst.
(screenshot of the report)
The investigation, which lasted about two and a half years, concluded that the four connecting screws of one of the three manual valves in the ground service conduit of the green hydraulic system failed due to metal fatigue, causing the valve to completely separate and puncturing the return flow of the blue hydraulic system. Well, this is a serious accident.
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The European Union once pointed out that the failure of the dual hydraulic system poses a safety risk
The report mentions that screw metal fatigue is a known problem. Airbus has published non-mandatory guidelines as early as 2007, adding new bolts to solve the problem of connecting screws. Until the end of 2019, the European Union Aviation Safety Agency believes that double The failure of the hydraulic system was a safety risk, so Airbus was forced to add new bolts to the airliner.
Airbus provided guidelines (P/N NAS1101-3H8) on December 18, 2019, three months after the accident, to replace the attachment screws of the manual valve for each affected component. The guidelines were issued in 2020. Revised on February 18 and April 6 of the same year.
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