The latest information released by investigators still doesn't answer why the pilots on three previous flights were able to handle the problem while the crew on October 29 ended up diving at high speed into the sea, said John Cox, president of consulting company Safety Operating Systems and a former airline pilot. The bulletin, which will be released as early as Wednesday morning Jakarta time, will alert pilots to follow an existing procedure to handle the problem, the person said.
Tears flowed as flowers were thrown into the water in remembrance of the 189 lives lost on board Lion Air flight JT-610.
These sensors measure the angle of attack of planes when climbing to ensure that they do not attempt to fly too steeply and stall.
The doomed Lion Air flight that crashed into the sea, killing 189 passengers last month, was found to have a malfunctioning air speed indicator for its last four flights - and, crucially, at the time of the crash, according to the head of Indonesia's National Transportation Safety Committee.
Utomo confirmed to CNN that there were two airspeed indicators in the cockpit.
They did not say whether the problems stemmed from a mechanical or maintenance issue, or whether the faulty meter was a factor in the crash.
Boeing did not respond to a request for a comment by CNN.
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Indonesian investigators, the plane's manufacturer, Boeing, and the U.S. National Transportation Safety Board are formulating a more specific inspection for Boeing 737 MAX 8 planes related to the airspeed problem, Mr. Tjahjono said.
It did not give more details and did not speculate on how the indicator problem may have played a role in the crash, as it continues to mine the flight recorder - seen as key to answering why a almost brand new plane fell out of the sky. While additional details of the bulletin aren't known yet, the warning is the first concrete action to come out of the accident investigation.
The Chicago-based planemaker has delivered 219 Max, the latest and most advanced 737 jets, since the new models made their commercial debut previous year with a Lion Air subsidiary. The single-aisle family is Boeing's biggest source of profit. But the urgency of a fatal accident can trigger a flurry of such notices.
"Lion Air has failed", said a man who identified himself as the father of passenger Shandy Johan Ramadhan, a prosecutor in a district on the island where the flight was headed.
"We are still focusing on handling the families of the victims, including returning their remains to their home", Sirait said by phone.
In order to dispel rumors, "we want to clarify that in the black box there were four flights that experienced problems with the airspeed indicator", agency head Soerjanto Tjahjono said.
Representatives of 737 MAX operators, Singapore Airlines Ltd (SIAL.SI) offshoot SilkAir, Garuda Indonesia (GIAA.JK) and Canada's WestJet Ltd (WJA.TO), said they had not yet received a bulletin from Boeing. Boeing has sent experts to Indonesia to assist with the investigation.