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Lion Air JT610 crash: What the preliminary record tells us

Lion Air JT610 crash: What the preliminary record tells us
28 November 2018 - 16:47 'was also added 145 Viewed.
Workers look at parts of the wreckage of crashed Lion Air flight JT610 Symbol copyright EPA Image caption The wreckage was once discovered 370m from the plane’s ultimate recognized position

Indonesian investigators have launched a initial document on the Lion Air flight JT610 that crashed on 29 October, killing 189 other folks.

It details what’s recognized by means of the government about the little while the Boeing 737 Max plane used to be within the air, but does not provide a definitive result in for the accident.

The full record isn’t anticipated till subsequent year – however here is what we all know to this point.

there were critical technical problems on earlier flights

The air flight upkeep log showed six problems were known on the aircraft on the grounds that 26 October, together with mistakes with its airspeed and altitude information displays.

The airplane’s attitude-of-assault sensor – that measures the attitude among the wings and the glide of air – encountered issues and used to be replaced the day sooner than the crash.

But, in line with the initial record, issues persisted.

within the most up-to-date flight before the crash, from Denpasar on Bali to Jakarta, the pilot issued a “Pan Pan” name – an urgency sign that may be one degree below “Mayday”.

The crew mentioned that the aircraft was working in ordinary conditions because of tool failure.

Then Again, they controlled to land the airplane accurately after inquiring for an uninterrupted descent, and the problems have been logged.

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The initial report says that the stick shaker – a warning device that signals flight crew when their plane is at risk of stalling – was lively within the flight.

This was once an “un-airworthy situation” and the flight shouldn’t have endured, it mentioned.

What happened on flight JT610?

JT610 departed from Jakarta airport on runway 25L, at 06:20 local time on 29 October / 23:20 GMT on 28 October.

Both the pilot and co-pilot have been skilled – the pilot had over 6,000 flying hours, even as his 2d-in-command had greater than 5,100 hours.

in keeping with the preliminary record, this is what came about after the plane took off.

23:21 GMT – The co-pilot asks an air site visitors controller for confirmation of the airplane’s altitude on their radar show. The pilot then flags up that there may be a “flight regulate downside”. 23:22 – The aircraft’s computerized anti-stalling device pushes the airplane’s nose down for 10 seconds. The flight group right kind this via manually pointing the plane’s nostril up. 23:22 – The co-pilot asks for the airplane’s floor pace as proven at the air site visitors controller’s radar display. 23:25 – The anti-stalling machine pushes the plane’s nostril down once more, and group correct this by pointing it up. This collection maintains for the rest of the flight. 23:29 – The air traffic controller notices that the flight appears to be descending. The co-pilot says they’ve a flight keep an eye on problem and are flying the aircraft manually. 23:30 – The crew touch the airport’s arrival controller, who tells them to organize to land back on runway 25L. 23:31 – The crew say they can not decide the altitude of the airplane, as a result of all the plane tools are indicating different altitudes. They ask the arrivals controller to block the air area 3,000 ft above and beneath them so that they can keep away from other site visitors. The controller approves this request. 23:31 – Contact with the plane is misplaced shortly afterwards.

The aircraft’s flight knowledge recorder has been retrieved but government are yet to find the cockpit voice recorder which could supply additional information approximately how the pilots reacted.

The wreckage used to be known 370m (1,200ft) from the last recorded plane place, and the damage to the airplane suggested a high power affect, the file stated.

How serious have been the technical problems?

Investigators say it is too early to conclude what led to the crash.

Symbol copyright Getty Photographs Symbol caption All 189 other folks on board misplaced their lives

Nurcahyo Utomo, aviation head on the National Transport Protection Committee, instructed the BBC that “several issues passed off concurrently” throughout the flight, together with issues of measuring air velocity and altitude, and with the stick shaker.

There looked as if it would be specifically critical issues of the anti-stall device.

Anti-stall systems save you a plane from pointing upwards at too high an perspective, the place it could lose its lift.

On The Other Hand, all through flight JT610, the airplane’s computerized anti-stalling device many times forced the plane’s nose down, even if the aircraft was once no longer stalling – perhaps as a result of a misguided sensor.

Pilots tried to right kind this by pointing the nose higher, till the device driven it down again. This took place more than 20 occasions.

Was Once there a problem with the plane layout?

The record does not achieve any conclusions.

One of the victims’ circle of relatives are suing Boeing, and accuse the airplane manufacturer of failing to tell the pilots of the new anti-stalling characteristic on its 737 Max airplane system that might “push the nostril down abruptly”.

Boeing has stated that “the 737 Max is as safe as any aircraft that has ever flown within the skies” and that “the proper procedure to deal with unintended horizontal stabiliser movement” is contained within the related flight manuals.

The proper approaches seemed to had been followed in the Denpasar flight prior to the crash, it said.

However, Nurcahyo Utomo advised the BBC: “We Haven’t discovered the tips in the guide relevant to the new characteristic to the 737- MAX, related to the feature for the stall prevention gadget.”

If the automatic machine kicked in and “the pilot did not recognise what was once happening”, there was a chance it would confuse the pilots, he introduced.

Did anything go wrong?

The file has really helpful that Lion Air strengthen its safety tradition, to permit pilots to make correct selections – including figuring out to discontinue a flight if the plane becomes un-airworthy.

It additionally stressed that operational documents must be properly filled in – stating that the JT610 weight and stability sheet stated 5 flight attendants had been on board, when if truth be told there were six.

How secure is Lion Air?

Finances airline Lion Air has in recent years risen to become an incredible participant in South East Asia’s cheap aviation sector.


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