Re: [SystemSafety] MH370

From: Matthew Squair < >
Date: Tue, 11 Mar 2014 22:59:07 +1100


ADS-B is an excellent system, we have full coverage here in Oz and the 33 ground stations give us a nationwide ATC capability (for ADS-B equipped aircraft) above 30,000 ft, So the question should be I think what state were the other aircraft systems in? I'm not sure what information is around, but if they are real ADS-B messages they should (depending on mode) include a lot more than just alt.

On Tue, Mar 11, 2014 at 9:12 PM, Peter Bernard Ladkin < ladkin_at_xxxxxx

>
> On 2014-03-11 10:12 , Chris Hills wrote:
> > Actually you don't need a detachable FDR or CVR. All you need is a
> detachable simple distress
> > beacon with a life of 48 hours. If you can find that it would narrow the
> search field to say, a 10
> > mile radius, rather than thousands of square miles. Then you can find
> the wreckage and the black
> > boxes far faster.
>
> Moot point. The aircraft was equipped with ADS-B. That should suffice to
> say where it is, much more
> closely than within a ten mile radius. More like, within a few meters.
> Every minute.
>
> According to an experienced ex-ATC colleague who found it on the Internet,
> there are ADS-B returns
> from FL 350, then two from FL 0 (!!), then nothing.
>
> If those transmissions are veridical, then there is a puzzle how it got
> from FL350 to FL 0, that's
> five vertical miles, in a minute or less. That is a vertical velocity of
> 300 mph, 480 kph, or over.
> While continuing to transmit, so still attached to electricity supply and
> thus parts of airplane.
> When airplanes break up, the busses usually quit too. If they are not
> veridical, then the puzzle is
> what on earth can have been going on, while continuing to transmit.
>
> The aircraft was also equipped with ACARS, which would be transmitting
> notifications from the
> avionics fault/failure detection systems. But I understand there's
> nothing. In particular, no
> mention of an ADS-B fault.
>
> It was also at the time generating military primary radar returns, whence
> comes the suggestion of a
> turn-back.
>
> The big puzzle is not only where it is but is how it could have
> disappeared. That is why people are
> thinking either
> 1. If there was a system failure, then something catastrophic happened,
> suddenly, so all systems
> failed simultaneously; or
> 2. Somebody turned off the kit.
>
> Option 1 would lead to wreckage being strewn across the ocean, but none
> has been seen. It also
> doesn't explain the partial ADS-B returns. Option 2 suggests hijack.
>
> There is also the option
> 3. Somebody was spoofing the entire ADS-B returns. But then, surely we
> would seen a disconnection in
> the radar/ADS-B traces?
>
> The point here is that ADS-B was supposed to take care of all these
> concerns about where an aircraft
> is at what time. All of them. It didn't - while apparently continuing to
> transmit. How not?
>
> PBL
>
> Prof. Peter Bernard Ladkin, Faculty of Technology, University of
> Bielefeld, 33594 Bielefeld, Germany
> Tel+msg +49 (0)521 880 7319 www.rvs.uni-bielefeld.de
>
>
>
>
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-- 
*Matthew Squair*
MIEAust CPEng

Mob: +61 488770655
Email: MattSquair_at_xxxxxx
Website: www.criticaluncertainties.com <http://criticaluncertainties.com/>



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