Faulty equipment and the crew's "inability to control the aircraft" caused an AirAsia A320 to crash into the Java Sea last year, killing all 162 people onboard, an Indonesian report said Tuesday.
Flight QZ8501 plunged into the ocean in stormy weather on December 28, during what was supposed to be a routine flight from the Indonesian city of Surabaya to Singapore.
The crash of the Airbus A320-200 triggered a huge international search, with ships and aircraft from several nations involved in a lengthy hunt that was hampered by strong currents and bad weather.
The bodies of 56 of those who died have never been found.
In their final report into the accident released Tuesday, Indonesia's official National Transportation Safety Committee said poor maintenance and a fault with the system that helps control the rudder's movement was a major contributing factor into the crash.
Cracked soldering in the component caused it to malfunction and send repeated warning messages to the pilots, it said.
When they received the fourth warning, the pilots tried to reset a computer system but also turned off the plane's autopilot, sending it into a sharp roll from which they were unable to recover.
"Subsequent flight crew action resulted in inability to control the aircraft," said the report. The plane went into a "prolonged stall condition that was beyond the capability of the crew to recover", it said.
The report said the faulty component, the Rudder Travel Limiter, had suffered 23 problems in the past 12 months, citing maintenance records.
PHOTO GALLERY: Black day for QZ8501 families as bodies found in sea
It said that maintenance records were "unable to identify repetitive defects and analyse their consequences".
It added the flight data recorders did not indicate the weather had affected the aircraft.
An Airbus spokesman told AFP: “Airbus has given Indonesian authorities all the support and technical expertise requested, and is studying the detailed contents of the report and its recommendations."
String of aviation disasters
A minister previously described how the plane climbed fast and then went into aerodynamic stall, losing lift, before it went down, while an investigator said the warning alarms were "screaming" as the pilots desperately tried to stabilise the aircraft.
Investigators had also revealed that the French co-pilot, Remi Plesel, was at the controls of the AirAsia plane in the moments before it crashed, rather than the more experienced pilot, Captain Iriyanto, who had around 20,000 hours of flying time.
READ: QZ8501: 10 families sue AirAsia, Airbus
Rescuers faced difficulties in the choppy waters of the Java Sea, but the main body of the plane was eventually located on the seabed by a Singapore navy ship and both black box data recorders were recovered.
Search efforts were finally called off in March after almost three months of hunting.
The crash was one of several aviation disasters in the sprawling archipelago in the past year, and the first major setback for Malaysia-based AirAsia group and its flamboyant boss Tony Fernandes after a spectacular run of success.
In August, a turbo-prop plane operated by Indonesian domestic carrier Trigana crashed in the remote, eastern region of Papua during a short flight in bad weather, killing all 54 people on board.
And in June an Indonesian military plane went down into a residential neighbourhood in the city of Medan, exploding in a fireball and killing 142 people.
Indonesian airlines are expanding rapidly after years of strong economic growth and the emergence of a new middle class, who have the money to fly around the more than 17,000 islands that make up the archipelago, rather than travel by road or sea.
But existing infrastructure is inadequate and carriers are struggling to find enough well-trained personnel to keep up with the boom, experts say.
AFP
Tue Dec 01 2015
The bodies of 56 of those who died have never been found.
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