U.S. investigators suspect that Malaysia Airlines 3786.KU -4.08% Flight 370 stayed in the air for about four hours past the time it reached its last confirmed location, according to two people familiar with the details, raising the possibility that the plane could have flown on for hundreds of additional miles under conditions that remain murky.
Aviation investigators and national security officials believe the plane flew for a total of five hours, based on data automatically downloaded and sent to the ground from the Boeing Co. BA +0.31% 777’s engines as part of a routine maintenance and monitoring program.
That raises a host of new questions and possibilities about what happened aboard the widebody jet carrying 239 people, which vanished from civilian air-traffic control radar over the weekend, about one hour into a flight to Beijing from Kuala Lumpur.
Six days after the mysterious disappearance prompted a massive international air and water search that so far hasn’t produced any results, the investigation appears to be broadening in scope.
U.S. counterterrorism officials are pursuing the possibility that a pilot or someone else on board the plane may have diverted it toward an undisclosed location after intentionally turning off the jetliner’s transponders to avoid radar detection, according to one person tracking the probe.
The investigation remains fluid, and it isn’t clear whether investigators have evidence indicating possible terrorism or sabotage. So far, U.S. national security officials have said that nothing specifically points toward terrorism, though they haven’t ruled it out.
But the huge uncertainty about where the plane was headed, and why it apparently continued flying so long without working transponders, has raised theories among investigators that the aircraft may have been commandeered for a reason that appears unclear to U.S. authorities. Some of those theories have been laid out to national security officials and senior personnel from various U.S. agencies, according to one person familiar with the matter.
At one briefing, according to this person, officials were told investigators are actively pursuing the notion that the plane was diverted “with the intention of using it later for another purpose.”
As of Wednesday it remained unclear whether the plane reached an alternate destination or if it ultimately crashed, potentially hundreds of miles from where an international search effort has been focused.
In those scenarios, neither mechanical problems, pilot mistakes nor some other type of catastrophic incident caused the 250-ton plane to mysteriously vanish from radar.
The latest revelations come as local media reported that Malaysian police visited the home of at least one of the two pilots.
A Malaysia Airlines official declined to comment. A Boeing executive who declined to be named would not comment except to say, “We’ve got to stand back from the front line of the information.”
The engines’ onboard monitoring system is provided by their manufacturer, Rolls-Royce RR.LN -0.80% PLC, and it periodically sends bursts of data about engine health, operations and aircraft movements to facilities on the ground.
“We continue to monitor the situation and to offer Malaysia Airlines our support,” a Rolls-Royce representative said Wednesday, declining further comment.
“The disappearance is officially now an accident and all information about this is strictly handled by investigators,” said a Rolls-Royce executive who declined to be named, citing rules of the International Civil Aviation Organization, a United Nations agency.
As part of its maintenance agreements, Malaysia Airlines transmits its engine data live to Rolls-Royce for analysis. The system compiles data from inside the 777’s two Trent 800 engines and transmits snapshots of performance, as well as the altitude and speed of the jet.
Those snippets are compiled and transmitted in 30-minute increments, said one person familiar with the system. According to Rolls-Royce’s website, the data is processed automatically “so that subtle changes in condition from one flight to another can be detected.”
The engine data is being analyzed to help determine the flight path of the plane after the transponders stopped working. The jet was originally headed for China, and its last verified position was half way across the Gulf of Thailand.
A total flight time of five hours after departing Kuala Lumpur means the Boeing 777 could have continued for an additional distance of about 2,200 nautical miles, reaching points as far as the Indian Ocean, the border of Pakistan or even the Arabian Sea, based on the jet’s cruising speed.
Article credit: The Wall Street Journal