China Eastern Airlines flight MU5735 737-800 Crash 17

[Eufalconimorph]

Avherald.

Reuters.

Dash cam footage showing crash angle.

Video of security camera video, straight on (angle of descent looks steeper than reality).

 

[dik]

I thought the longitude and latitude were posted earlier; are these not correct? From the accuracy indicated it narrowed the space down to about a foot (not really realistic).

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Alistair_Heaton]

A foot is realistic with aircraft systems with western hardware.

 

[RedSnake]

Since I couldn't read the whole article I am making a guess here.

The piece was found here ?

I say it again if you try to take the plane out of a dive to fast on purpose or it doing it on it's own it will brake and pieces will fall off.

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein

 

[dik]

Thanks Alistair... I was aware the accuracy is such, but locating the plane crash site to that small an area is a bit off...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Sym P. le]

I am making a guess here.

The piece was found here ?

That's the gist of it but with a ton of waffle room.

 

[FacEngrPE]

You get to the foot and better accuracy with G

https://www.faa.gov/about/office_or...nits/techops/navservices/gnss/waas/howitworks

 

[FacEngrPE]

You get to the accuracy levels Allister is stating with differential correction of GPS signals. This is some information about the FAA managed portion of the system.
Satellite Navigation - WAAS - How It Works

https://www.nstb.tc.faa.gov/RT_WaasSatelliteStatus.htm

The FAA does not support the China airspace with this system.

 

[Alistair_Heaton]

We don't actually use WAAS in Europe we use SBAS. And there is a version in china called SNAS or something like that links into their Biedou system and GPS.

https://www.icao.int/APAC/APAC-RSO/..._GBAS-SBAS Implementation in China (X Li).pdf

In theory the Level 2 Galileo commercial signal doesn't need it. But things have gone quiet on that front since Brexit. And there hasn't been any noise about the car systems either which they were planning on making every new car sold in europe have one fitted.

 

[Debirlfan]

FYI, they found the flight data recorder. Sounds like it's in pretty good shape.

 

[Alistair_Heaton]

https://news.sky.com/video/china-pl...ould-explain-why-aircraft-nose-dived-12576121

looks in very good condition.

 

[dik]

...a zip top like a beer. How clever!

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Alistair_Heaton]

Wonder how they get data and power into it.

 

[dik]

Well insulated battery of some kind... I'd think something other than lithium. It might be that it's detachable. I think the power would be independent of the aircraft power. The solid state memory should not require power after the crash. Solves the problem of it being viable after 30 days.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Alistair_Heaton]

it attaches to another box with the Pinger etc in it. I don't think it will have a battery internally. Just couldn't see any connection ports.

 

[dik]

'Pinger' is that the alarm 'beacon'? It would need a source of power to activate that and keep it going for 30 days...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

Do they survey a crash site with a total station? or maybe a drone with Lidar? to record all the 'parts'?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Do you feel any better?

-Dik

 

[RedSnake]

I guess it depends on who is doing the investigation.
The Swedish Accident Investigation Board didn't do that here in Umeå, they didn't take all parts and they didn't find all parts, one piece was recovered more the 9 month later even though it was on an isle and it isn't very big.
But I am guessing it is different when it is a commercial pax plane.

They weren't even interested in all the debris, because it was just "scrap" meaning it wasn't useful for the investigation.

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein

 

[debodine]

Regarding batteries in the "black" boxes, it has been a long time since I personally touched one, but as I recall the FDR and the CVR do not have batteries for the recording function. They record from aircraft power. However, the CVR typically also has a "pinger" [beacon] that is powered by a battery when the CVR is in water. To the best of my knowledge the "pinger" only works when immersed. However, persons with more current knowledge than I have may be able to describe it more accurately.

 

[debodine]

A little further info for those who might wish to dig deeper. I was in error in one statement where I only noted the CVR would have a "pinger" (Underwater Lcoator Beacon or ULB) - actually both the CVR and FDR can have a battery driven ULB. However, as I noted, the battery for the ULB will only power the ULB to locate the article underwater. No batteries exist in the CVR or FDR to provide backup power to record data once aircraft power is lost.

Cockpit Voice Recorder TSO-C123( ) which refers to EUROCAE document ED-112A for the Minimum Performance Standards.

Flight Data Recorder TSO-C124( ) which refers to EUROCAE document ED-112A for the Minimum Performance Standards.

Underwater Locating Devices TSO-C121( ) which refers to SAE document AS-8045a for the Minimum Performance Standards.

Also to help avoid potential confusion, the Cockpit Voice Recorder or CVR generally goes by that naming convention. However, depending upon the decade of the flight recorder (and the age of the person discussing it), it may be referred to as Flight data recorder (FDR), Digital Flight Data Recorder (DFDR), Flight Data Acquisition Unit (FDAU), or Digital Flight Data Acquisition Unit (DFDAU).

 

[Alistair_Heaton]

To note the CVR and FDR have multiple power sources in the aircraft. Engines, Batteries and RAT *ram air turbine

Its in the last items list that looses power.