Asiana crash 7.6.2013

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Royal
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Re: Asiana crash 7.6.2013

Post by Royal » Tue Jul 09, 2013 11:38 pm


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Pigeon
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Re: Asiana crash 7.6.2013

Post by Pigeon » Wed Jul 10, 2013 1:06 pm

As US investigators interviewed the pilots of Asiana flight 214, a new picture emerged of a confused and chaotic situation inside the cockpit in the last 16sec before the Boeing 777-200ER's main landing gear caught the lip of the sea wall on the runway threshold at the San Francisco airport.

The captain flying, identified by Asiana as Lee Gang Guk, and the captain instructor, Lee Jeong-min, realized as they passed 4,000ft on approach to Runway 28 Left that they were "slightly high", says Deborah Hersman, chairman of the National Transportation Safety Board.

At that point, the crew set the vertical speed mode on the visual approach at about 1,500ft per minute, she says. But that descent rate brought the 777 down too fast.

As they passed 500ft, Lee Jeong-min, who was making his debut flight as a 777 instructor, noticed the three glowing red lights on the airport's precision approach path indicator that signaled they were slightly too low, Hersman says the captain told the NTSB.

The instructor told the captain flying to pull-up, Hersman says. At roughly the same time, the aircraft yawed off the centreline, forcing the crew the to make a quick series of corrections in two directions.

"They were making corrections vertically because they knew they were too low," Hersman says, "and they are making lateral corrections to line up on the centreline."

Amidst this burst of activity, both crew members lost track of the aircraft's perilously slowing speed, with the aircraft climbing slightly to regain altitude and the engines stuck on idle. At least one of the crewmembers, Lee Jeong-min, believed he was under a fatal misapprehension.

"They had set speed at 137kt (254km/h) and he assumed the autothrottles were maintaining speed," Hersman says, based on the interview with Lee Jeong-min.

But the automatic speed protection system, for reasons that are still unclear, did not maintain the aircraft at 137kt.

"He went to push the [throttles] forward, but he stated that the other pilot had already pushed the throttles forward," Hersman says.

Unfortunately, it was already too late. The aircraft slowed to a low speed of 103kt, then accelerated to 112kt as the nose crossed the threshold of the runway. But the 777 was still too low and the main landing gear clipped the edge of the sea wall separating Runway 28 Left from San Francisco Bay. That caused the aircraft to sink further and the tail to strike the runway, ripping Section 47/48 aft of the pressure bulkhead off the airframe.

The pilots reported seeing the aircraft "balloon" upward, yaw left and spin in a 360 degree circle as the aircraft crashed down on the runway again. The collision tore open an oil tank on the No. 2 engine, igniting a fire that eventually would burn through the upper section of the forward fuselage.

The NTSB is now working to solve a number of puzzles related to the crash, especially why the autothrottles did not perform in the manner that the crew expected.

After the crash, the NTSB entered the cockpit and found the autothrottles in the armed position, Hersman says. Her investigators are now verifying that discovery with the flight data recorder. If he recorder corroborates the on-scene finding, the NTSB will then explore how the autothrottles function in different operational modes.

"Armed means that they are available to be engaged, but depending on what mode is used we really need to understand that a little better," Hersman says.

Link


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Royal
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Re: Asiana crash 7.6.2013

Post by Royal » Thu Jul 11, 2013 6:33 am

Federal crash investigators revealed Wednesday that the pilot flying Asiana Airlines flight 214 told them that he was temporarily blinded by a bright light when 500 feet above the ground.

Deborah Hersman, chairwoman of the National Transportation Safety Board, said it wasn't clear what could have caused the problem. Asked specifically whether it could have been a laser pointed from the ground, Hersman said she couldn't say what caused it.

http://www.usatoday.com/story/news/nati ... d/2507059/
:o

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Re: Asiana crash 7.6.2013

Post by Pigeon » Thu Jul 11, 2013 2:34 pm

It was midday. Reflection? I think this was an excuse to throw in for bad performance. Where are the UFO guys...

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Royal
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Re: Asiana crash 7.6.2013

Post by Royal » Thu Jul 11, 2013 2:45 pm

It occurred to me that it could be a cop out. Hopefully they can detail whether the light came from the sky or the ground. The investigators speculate laser pointer from the ground, but that would be their best guess.

Can you imagine if they said "we saw a light in the sky and was distracted".

Refer to "Sir, we are under attack thread" for the UFO guys. :)

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Re: Asiana crash 7.6.2013

Post by Pigeon » Thu Jul 11, 2013 5:06 pm

This is not good. Were the pilots gonna claim good landing.

The lead flight attendant entered the cockpit after it came to a stop off Runway 28 Left at San Francisco International airport and asked the flight crew what she should do.

"The flight crew told the flight attendant not to initiate an evacuation," Hersman says.

Instead, the lead flight attendant announced to the passengers to remain seated. In the economy class cabin, however, another flight attendant could see a fire on the No. 2 engine, tucked next to the fuselage around Row 10 of the passenger cabin. He sent another flight attendant to the front to explain to the flight crew that the passengers needed to evacuate, Hersman says.

Videos reviewed by the NTSB show that the passenger doors were not opened and the slides deployed until 90sec after the Boeing 777-200ER with 307 passengers and crew came to a stop


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Re: Asiana crash 7.6.2013

Post by Royal » Thu Jul 11, 2013 6:47 pm

No evacuation? That's odd. Maybe they were in a state of denial.

About the Gang-Guk style landing, do you think investigators would even acknowledge a hack knowing the scare it would cause nationwide? Looked like the gauge read an incorrect speed, and when they tried to speed up the craft, they went nowhere. Something was "locked" either by pilot error or through a hack. Timing of the crash is odd, I'm going to say hack.

The news has not provided a clear explanation, nor would they want to reveal such tech.

Exploiting those vulnerabilities means that it's possible to gain information about the onboard computer, as well as deliver spoofed malicious messages that affect the behavior of the plane. There's a rather worrying set of functions in Teso's Android app called PlaneSploit—from changing the intended destination, through flashing interior lights to, umm, crashing the plane—though it's unclear quite how well they'd work in practice.
http://gizmodo.com/5994356/how-a-single ... tire-plane
"Please turn your phones off".

The FAA bans the use of wireless devices during flight because of "potential interference to the aircraft's navigation and communication systems." The FAA allows use of some non-transmitting electronic devices outside of critical phases of flight such as takeoff and landing. During those noncritical phases of flight, the airlines set their own policies regarding passenger use of non-transmitting electronic devices.
http://www.cnn.com/2013/05/10/travel/el ... -in-flight

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Re: Asiana crash 7.6.2013

Post by Pigeon » Thu Jul 11, 2013 8:14 pm

The pilots did it wrong. The engines were at about idle. It takes time for them to spool up. They forgot to watch the air speed for whatever reason. If the plane was over the runway, ready to touchdown, it was going to be a crash. Remember the stall warning?

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Re: Asiana crash 7.6.2013

Post by Pigeon » Fri Jul 12, 2013 5:31 pm

Another animation - some say it might not be totally accurate


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Re: Asiana crash 7.6.2013

Post by Royal » Fri Jul 12, 2013 6:18 pm

So this takes the form of bad asian driving. In this case- piloting.

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