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LATAM B773 complete electrical failure?

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LATAM B773 complete electrical failure?

Old 10th Aug 2021, 20:03
  #101 (permalink)  
 
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That was a truly nasty set of failures. Top marks to the pilots for what looks like excellent CRM leading to a successful outcome.
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Old 11th Aug 2021, 00:12
  #102 (permalink)  
 
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What I found really unexpected, that report says

During landing, the brake set overheated, which started the fire on the wheels of the
main right and left landing gears. The Fire Section carried out the fire fighting, which was controlled in 4 minutes. From the beginning of the fire extinguishing to cooling the set of brakes, 65,700 liters of water and 780 liters of Foam Generating Liquid (LGE) have been spent.
that's 65 tons of water to control the wheel fire. Seems quite a bit more than I would expect.
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Old 11th Aug 2021, 04:44
  #103 (permalink)  
 
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Water usage

I think thats fully ok. The wheels are big and many, and the brakes: same. Plus, they carry all the heat from braking the overweight airplane in them. Amazing, that they could take it, anyway.
So, a quantity of water is needed to cool things down. Quite ok with me.
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Old 11th Aug 2021, 14:24
  #104 (permalink)  
 
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And some of the water must have been mixed with the 780 L of foam concentrate. That wouldn't do much to cool the wheels themselves.
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Old 12th Aug 2021, 04:45
  #105 (permalink)  
 
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65 tonnes = 65 cubic meters. Or a swimming pool about 5.5m x 6m x 1.96m deep (water is pretty massive). Doesn't seem like a lot to me, given the mass of the main gear trucks (~6.8 tonnes each).

Plus it occured in local tropical summertime. Daily high temperatures of 28C - the water may have been 25-35C after sitting in the sun all day, and thus less efficient in absorbing and removing heat from the metal/rubber/carbon of the gear.

One would have to juggle starting temps, specific heats, joules, volumes/masses and such to get an estimate of water required to achieve cooling of xxC. And then factor in inefficiency of delivery (water that just sprays on the runway).
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Old 12th Aug 2021, 09:23
  #106 (permalink)  
 
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That's likely the total contents of the fire tenders, which would just blast until all used up.
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Old 12th Aug 2021, 15:22
  #107 (permalink)  
 
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By my math, it would take something like 300 tonnes of steel at 1100 degrees Celsius to flash 65 tonnes of 100 degree water to 100 degree steam. So it seems safe to say the runway got pretty wet.
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