DreamLiner and Li-ion

So they've just discovered Li-ion can be a fire risk?
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*Parenthetical remarks (however relevant) are (usually) unnecessary *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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Seen the photos of the batteries?
http://www.theregister.co.uk/2013/01/17/faa_grounds_boeing_787_batteries /
http://www.thetimes.co.uk/tto/multimedia/archive/00374/119910330__374392c.jpg
Wouldn't be too happy flying with that happening under my feet.
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On 18/01/2013 08:51, Mike Tomlinson wrote:

Not really surprising. Li-ion is volatile chemistry and if it gets slightly maltreated can go into thermal runaway self heating. That is the price for the energy density vs weight trade-off.

The big worry is that on the Dreamliner the electrical systems are absolutely essential for control of the flight surfaces. There is no independent hydraulic system although presumable there must be some manual way of lowering the undercarriage for landing in extremis.
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On 18/01/2013 09:28, Martin Brown wrote:

Possibly not. The undercarriage is only really essential if you want to be able to take off again after the landing.
Colin Bignell
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On Fri, 18 Jan 2013 11:17:37 +0000

From a report of the earlier incident: "In today’s problem, the automated landing gear did not operate, but the pilot was able to lower the landing gear manually – using gravity – and landed on the plane's second approach to the runway."
http://www.computerworlduk.com/news/it-business/3316405/boeing-dreamliner-automated-landing-systems-fail-on-japan-flight /
So, kind-of, sort-of, maybe. As long as the undercarriage doors open. -- Davey.
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On 18/01/2013 11:28, Davey wrote:

...
http://www.computerworlduk.com/news/it-business/3316405/boeing-dreamliner-automated-landing-systems-fail-on-japan-flight /
There is also the possibility when relying upon gravity that the gear might drop but fail to lock in position, which could result in it collapsing after landing.
Colin Bignell
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On Fri, 18 Jan 2013 15:58:52 +0000

Yes, I also wondered about that. But given the option, I would go for the gravity thing. -- Davey,
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Davey wrote:

It's safer to belly land than to land on partially locked gear. If the gear partially collapses after landing, it gets very nasty, very quickly. With no gear down, the behaviour of the aircraft is predictable to a degree.
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Tciao for Now!

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wrote:

Its much safer again to have it auto lock by gravity.
Its not hard to do, just an over center action.

Not if it’s the nosewheel.

But its much better to have a manual system that gets the gear down and locked instead.
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wrote:

Wodney, i've sent your cv to bae systems, you should be hearing from them shortly.
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Not if the mech is jammed by the frozen corpse of the stowaway.

Not if the mech is jammed by the frozen corpse of the stowaway.
MBQ
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wrote:

It isnt hard to ensure that no stowaway can get anywhere near that.
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Plenty have done.
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Man at B&Q wrote:
message

A few of them have fallen out as the plane flew across London and the crew opened the gear doors. Deep frozen refugee, after a few hours at -50C and very low air pressure.
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And no planes have had to land with the gear up because one of them has got frozen where it stops the gear from coming down.
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wrote:

Not one has stopped the landing gear coming down on any properly designed system.
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On Friday 18 January 2013 16:51 Davey wrote in uk.d-i-y:

That just gives me this mental image:
http://www.hkhinc.com/newmexico/albuquerque/doomsday/pickens.jpg
(Dr Strangelove - Major Kong manually releases the A Bomb from the plane which deploys with him sitting on it)
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Tim Watts Personal Blog: http://www.dionic.net/tim /

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wrote:

No need, they lock using gravity as well, for a reason.

Yeah, its by far the best way to do a fail safe system.
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Put sails on them and let the wind do the rest
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geoff

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On Fri, 18 Jan 2013 22:39:40 +0000

That would look good on the Spare Parts List! -- Davey.
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