The last four flights of Crashed Lion Air Jet had problems with the air speed indicator
The last four flights of Crashed Lion Air Jet had problems with the air speed indicator
JAKARTA, Indonesia: the last four flights of a Lion Air passenger plane crashed, all experienced problems with the new
Soerjanto Tjahjono, head of Indonesia's National Transport Safety Committee, said the researchers had concluded when analyzing the data from the memory unit of the recorder, one of the so-called black boxes of the plane.
The recorder's data is considered crucial to understanding the cause of the October 29 blockade, the first involving the Boeing 737 Max 8, the latest variant of the 737 single-aisle. All 189 people on board perished. The plane was delivered to Lion Air, one of Asia's largest low-cost airlines, in August.
Researcher Nurcahyo Utomo said that a team of experts is trying to determine if the failure in the air speed indicator was with a sensor, the computer system or the screen. The investigators will interrogate the pilots and technicians involved in the previous flights to see what actions they took in response to the problem.
The deadly crash of a Lion Air Boeing 737 aircraft in Indonesia is one of the worst aviation catastrophes of 2018. The WSJ discusses some of the big questions that arose as researchers try to determine the cause of the accident. Photo: AP Images
The 69-hour analysis of flight data from the recorder began on Monday and continues. The investigators said they had not concluded that the faulty air speed indicator was responsible for the accident. They added that they had not yet examined the altitude and other information from the recorder.
Airline pilots receive routine training to deal with unreliable speed indicators and, by themselves, such defects are not considered imminent threats to flight safety. In general, the answer is to maintain or slightly increase the thrust, avoiding dramatic increases or decreases.
Once the problem occurred on the Lion Air plane last week, the cockpit crew returned to manual flight and received permission from air traffic controllers to gradually climb some 2,500 feet to solve problems, according to the government of I know. UU And industry officials familiar with the probe. The immediate response was consistent with the general expectations of training, according to these officials and independent security experts.
But researchers are now focusing on the reasons for an abrupt drop in altitude, these people said, followed by fatal immersion. The operation of another flight control system, called the angle of attack indicator, should also be examined by the probe, according to safety experts. Such devices are critical for telling aviators how high or low the nose of an aircraft is pointing. The angle of attack sensors operate independently of the air velocity sensors.
More generally, the international crash investigation also focuses on actions taken by Lion Air maintenance personnel after each of the previous speed indication problems that resulted in safe landings, including interactions between pilots and mechanics. , according to these people.
Maintenance records could be important to discover the root cause of the accident, the US government said. UU And industry officials, because regulators and operators operating with the same variant of 737 have not discovered any pattern of defects or problematic indications of air velocity.
The Indonesian authorities have suggested that they favor the Federal Aviation Administration of the United States. UU Or shock investigators from the National Transportation Safety Board to consider long-range inspections or new safety bulletins for pilots. However, such movements are considered unlikely, unless the information downloaded from the flight data recorder points to more specific causes. On Monday, after the latest revelations in Indonesia, FAA officials were not considering any safety initiative, according to a person familiar with the details.
The Indonesian air traffic control authority lost contact with Flight 610 at 6:33 a.m., approximately 13 minutes after taking off from Jakarta's main airport for Bangka Island. Authorities said the pilots had requested to return to the Jakarta airport before disappearing from the radar.
The data collected by Flightradar24, a flight tracking network, indicates that the plane experienced possible erratic readings of speed and altitude on the flight that crashed and on the previous flight, from Bali to Jakarta. Lion Air has said that the plane experienced a "technical problem" not specified in the previous flight.
Potentially defective or deceptive airspeed indications in the cockpit have already emerged as an initial focus of safety experts entering the accident, according to industry officials who tracked the investigation.
Boeing Co., based in Chicago, which manufactured the plane, has privately suggested to at least one airline official and an external safety expert, his interest in knowing if the pilots received unreliable speed data, according to familiar people. with the conversations.
Indonesian investigators said in a statement that they had asked Boeing and the US National Transportation Safety Board. UU., Both participants in the investigation, "take the necessary measures to prevent similar accidents from happening again". That includes advising pilots on what to do if problems were found with the airspeed indicator, investigators told reporters.
A spokesman for Boeing declined to comment. In a statement last week, he said he was providing technical assistance in the investigation and addressing questions to the Indonesian authorities. The NTSB had no immediate comment.
Boeing has orders for more than 3,000 of the 737 Max 8 aircraft and has delivered around 220 since it started the flights last year.
The flight data recorder, retrieved by divers at a depth of approximately 100 feet three days after the accident, has provided information detailing the last 19 flights of the crashed aircraft and includes approximately 1,800 data parameters.
Search engines continue trying to locate the second black box, the cockpit voice recorder, which is believed to be under several feet of mud on the seabed. Mr. Utomo said that the search teams had heard weak pings that the recorder issued intermittently over the weekend.
The accident is the second worst air disaster in Indonesia, after a
Accident that killed 234 in September of 1997.
The country has a long history of aviation accidents, and its carriers were restricted for many years to fly to the United States and Europe for security reasons. The latest restrictions on Indonesian airlines were lifted in June this year.
-Robert Wall, Gaurav Raghuvanshi and Andy Pasztor contributed to this article.
Write to Ben Otto in ben.otto@wsj.com and I did Sentana in i-made.sentana@wsj.com
.
!function(f,b,e,v,n,t,s)
{if(f.fbq)return;n=f.fbq=function(){n.callMethod?
n.callMethod.apply(n,arguments):n.queue.push(arguments)};
if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
n.queue=[];t=b.createElement(e);t.async=!0;
t.src=v;s=b.getElementsByTagName(e)[0];
s.parentNode.insertBefore(t,s)}(window, document,'script',
'https://connect.facebook.net/en_US/fbevents.js');
fbq('init', '369524843414444');
fbq('track', 'PageView');
.
SOURCE LINK ERESVIRAL.COM https://www.beviral.online
Comentarios
Publicar un comentario