Potentially erroneous or misleading cockpit airspeed indicators have been highlighted as a first focus by security experts on the Lion Air plane crash in Indonesia, which killed 189 passengers and crew members, industry officials said Investigations have followed.
The company, which has produced the twin-engine Model 737 Max 8 and is participating in the probe, has privately suggested to at least one airline officer and one external security expert his interest in whether the pilots received unreliable speed data, according to the persons familiar with the talks ,
The aircraft, which was delivered to the airline in August, crashed into the Java Sea 1
The Chicago-based aircraft manufacturer has also signaled that its experts are particularly interested in maintenance, reportedly prior to the deadly flight on part of the airspeed measurement and reporting systems of the United States, according to an independent security expert closely associated with the company Aircraft were carried out.
At least one aviation officer said he had understood that a problem with airspeed monitoring was discussed the day before the crash due to maintenance.
The spokesman declined comment and referred to the company's earlier allegation that it provided technical assistance to the investigation and asked questions to the Indonesian authorities.
Discussions about possible speed deviations are preliminary and could change significantly when data is downloaded from flight data and data. Cockpit voice recorders refer to other potential system malfunctions or erroneous steps taken by the pilot. Pilots are routinely trained to cope with unreliable airspeed displays, and security experts said such reactions should not normally cause crews to lose control, especially in clear weather and visibility.
However, security experts say they can cope with irregular speed displays, making it difficult for some to fly, as they tend to rely on manual flying for the time being, skills rarely used in today's increasingly automated cockpits.
Investigators from the Indonesian and US governments have not provided details on the probe and air details Traffic control officials said the flight crew did not specify when they requested permission to return to the airport.
Airspeed and maintenance reporting will be part of the investigation, said Soerjanto Tjahjono, head of the Indonesian national. The Road Safety Committee, which runs the probe, told the Wall Street Journal without commenting on it. He confirmed that the investigators will investigate the circumstances of the specific maintenance checks before the crash.
Search at Sea
The new Boeing 737 model disappeared shortly after Jakarta's launch into Pangkal Pinang.
Boeing said in a message to operators who run the latest 737 Max 8 models eager to keep them up to date, however, pointed out that "currently no recommended action by the operator is recommended" a copy checked by the journal.
Such language typically indicates a manufacturer has not detected any systemic flaws or design flaws that require immediate safety checks or repairs.
A search of the United States Aviation Authority's records has not revealed any unusual pattern of problems or failures affecting airspeed indicators or other mechanical or electrical systems of the 737 Max 8 fleet, according to a person familiar with the matter.
Some other 737 Max 8 operators also said that this was not the case, aware of the aircraft's recurring error.
Based on public information about the Lion Air Flight 610 – combined with various types of communication between Boeing, some of its airline customers and external security experts – after the investigation, industry representatives are increasingly interested in examining which speed measurement the cockpit instruments were displayed. For Boeing 737 Max 8 aircraft, the master and copilot have separate airspeed indicators and an additional standby system.
Relatives complain as Indonesia responds to jetliner crash
Underwater tracking devices that are sent to the crash site attempt to find flight data and cockpit voice recorders of aircraft
Members of the Search and Rescue team in Jakarta are looking for recovered belongings that are believed to have come from the downed Lion Air JT610 flight on Tuesday.
edgar su / Reuters
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The Department of Transportation ordered the two Indonesian airlines to fly the Boeing 737 Max 8, Lion Air and Flag Carrier
to learn about repetitive problems with the display of airspeed and to explain all procedures for their elimination. The planes are not grounded and remain on duty, said Pramintohadi, the acting general director of air transport, the reporters.
Problems with faulty pitot tubes – airspeed sensors located under aircraft noses – are well documented over the years and led to a series of high-profile passenger aircraft accidents. They often occur at cruising temperatures at cruising altitudes – much higher than the Lion Air plane that did not climb over 5,000 feet – because ice crystals can accumulate and clog sensors.
Over the past decade, US and European regulators have issued a series of mandatory security updates to check or replace Pitot's fault-prone tubes at various locations
Jetliner and other models.
However, the same sensors can be affected by debris or other conditions on the ground. Pilots have detected cases of wasp nests in pitot tubes, and workers have mistakenly left cover after painting or maintenance.
"With this system, some things can go wrong, even if it's pretty straightforward," said a pilot for an American airline.
– Ben Otto contributed to this article.