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ANA 787 Emergency Landing in TAK - FAA grounds 787

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  • Originally posted by Gabriel View Post
    I haven't heard of many cases of battery fires in hybrid and electric cars. In fact, I haven't heard of a single one.
    Crash testing the Chevy Volt resulted in two fires - weeks after the test. IIRC the cause was coolant fluid leaking into the damaged battery and causing a short. Nevertheless, during the investigation, even with "severe" physical damage to the battery pack, they did not manage to cause another fire. Post crash protocol was revised to require discharging the battery as a precaution. http://www.wired.com/autopia/2011/11...hevrolet-volt/

    And...

    Originally posted by Alessandro View Post
    Mr Elon Musk explains what he thinks is the problem,
    http://www.flightglobal.com/news/art...unsafe-381627/
    Even SpaceX is successfully using Lithium battery tech.

    Methinks Boeing needs to (1) choose a new battery supplier (SpaceX, cut the politics) and (2) stop fooling themselves that lithium batteries don't have the potential to cause fires (hopefully they've learned this by now)

    Comment


    • Yeah, the Chevy Volt did catch fire.
      Apparently, not all Li-ion batteries are the same. They can have different chemistry and some say this makes a fundamental difference. There was also the 'differences in design' opinion from SpaceX.
      So can we put all these lithium batteries under the same denominator? Maybe somehow Boeing just chose the most unstable chemistry and design. And what about the safety mechanisms and sophisticated battery electronic control which should have prevented all this? I think the NTSB is looking into that too.

      Comment


      • well, from what i've read, LiPo batteries have none of the problems that LiIon batteries do. makes ya wonder...

        Comment


        • So this is Boeing's half-baked solution: http://www.tampabay.com/news/busines...es-say/1275693

          Great! Who doesn't want to fly on an airplane where there's a contained fire on board! The FAA will probably reject this, as they should.

          IMO, Boeing needs to quit playing around with their future and just install lead-cadmium batteries in all 787s. This is nuts.

          Comment


          • Originally posted by UALdave View Post
            So this is Boeing's half-baked solution: http://www.tampabay.com/news/busines...es-say/1275693

            Great! Who doesn't want to fly on an airplane where there's a contained fire on board! The FAA will probably reject this, as they should.

            IMO, Boeing needs to quit playing around with their future and just install lead-cadmium batteries in all 787s. This is nuts.
            Why lead? Why not NiCd?

            Comment


            • Originally posted by SYDCBRWOD View Post
              Why lead? Why not NiCd?
              Why Ni-Cd?
              Why not Li-MH, or Li-Po?

              --- Judge what is said by the merits of what is said, not by the credentials of who said it. ---
              --- Defend what you say with arguments, not by imposing your credentials ---

              Comment


              • Originally posted by Gabriel View Post
                Why Ni-Cd?
                Why not Li-MH, or Li-Po?
                What are Li-MH or Li-Po batteries; what do those letters stand for?? I've mentioned lead-cadmium batteries so much, because, other then lithium-ion, they're the only batteries that I've heard of being used on a commercial aircraft.

                So we have a family friend who worked for United for decades, and he said the problem with replacing the lithium-ion batteries with something heavier, is that the airline will be able to carry less passengers. But, better that then a serious safety hazard on-board, IMO.

                Comment


                • Originally posted by UALdave View Post
                  What are Li-MH or Li-Po batteries; what do those letters stand for?? I've mentioned lead-cadmium batteries so much, because, other then lithium-ion, they're the only batteries that I've heard of being used on a commercial aircraft.

                  So we have a family friend who worked for United for decades, and he said the problem with replacing the lithium-ion batteries with something heavier, is that the airline will be able to carry less passengers. But, better that then a serious safety hazard on-board, IMO.
                  Lead Calcium is probably what started your car this morning. Lead has issues including power density weight to power ratios and the Puekert Effect. Not well suited to an environment requiring lots of power in a short space of time whilst also being light and small.

                  NiCd (Nickel Cadmiums) are a proven option lighter and smaller than Lead chemistries (but with memory issues and high discharge issues). Nickel Metal Hydride (NiMh) is probably a better bet again.

                  LiPo (Lithium Polymer) may be straying to close to the unstable end of the spectrum.

                  Comment


                  • On a side note one of the areas that US exporters (including Boeing) have to take into consideration is the toxicity of their products. Certain countries and the EU have restrictions on the use of toxic metals such as lead, mercury, cadmium, and chromium. These restriction result in cost when disposing of products such as batteries.
                    Li-ion batteries can be readily disposed of.

                    Comment


                    • Just curious. Is the global lithium supply any sort of limiting factor in what batteries can be built into all sorts of electronics and transportation? Any research on viable non-lithium options? Seems like you see lithium in everything these days. (Apropos of nothing, I wish I'd put 25 percent of my retirement money in platinum a few years back)

                      Comment


                      • Originally posted by UALdave View Post
                        So this is Boeing's half-baked solution: http://www.tampabay.com/news/busines...es-say/1275693

                        Great! Who doesn't want to fly on an airplane where there's a contained fire on board! The FAA will probably reject this, as they should.

                        IMO, Boeing needs to quit playing around with their future and just install lead-cadmium batteries in all 787s. This is nuts.
                        I'm sure they have a plan B which involves lead-cadmium or something other than Li-Ion. But if they can hoodwink the FAA into letting them fly with increased containment system they will. They have obviously identified this as the optimum solution and will campaign for it for all they are worth.

                        If it doesn't work they will have a Plan B with safer Battery Choice.

                        Comment


                        • Originally posted by EconomyClass View Post
                          Just curious. Is the global lithium supply any sort of limiting factor ..............
                          I don't think so. I use Al-Li alloys for aerospace structures and have never heard that there mat be a lithium shortage. However the main cost impact of using Al-Li (over other al alloys) is that special friction stir weld equipment is required.

                          Comment


                          • Originally posted by tsv View Post
                            I'm sure they have a plan B which involves lead-cadmium ..............
                            Twp posters have mentioned lead-cadmium batteries; as far as I know there is no such nbattery type. There are lead-acid and nickel-cadmium batteries.

                            For info on battery power capabilities see attached plot from Aviation Week.

                            Comment


                            • Originally posted by Highkeas View Post
                              Twp posters have mentioned lead-cadmium batteries; as far as I know there is no such nbattery type. There are lead-acid and nickel-cadmium batteries.

                              For info on battery power capabilities see attached plot from Aviation Week.
                              Sorry for my mistake, you are correct of course. But anyway they will have several plans. If possible they will persevere with the LI-ION option with enhanced containment because there will be less new systems to be tested and approved so less down time. And if they manage to get approval for the Lithium option (again) there will probably be weight benefits.

                              But if the FAA get shaky about Li-Ion and want Nickel-Cadmium/Lead Acid or whatever they will have a Plan B ready to accommodate theme. Obviously at the end of the day they need the 787 back in the Air no matter what because they can still make a lot of money out of this Aircraft in the longer term. Or lose a lot if it doesn't get it's wings back.

                              Comment


                              • Originally posted by EconomyClass View Post
                                Just curious. Is the global lithium supply any sort of limiting factor in what batteries can be built into all sorts of electronics and transportation? Any research on viable non-lithium options? Seems like you see lithium in everything these days. (Apropos of nothing, I wish I'd put 25 percent of my retirement money in platinum a few years back)
                                OT no, large untapped resources in Chile and Bolivia.
                                Back to the 787 grounding,
                                both JAL and ANA has now cancelled 787 flights until end of May.
                                "The real CEO of the 787 project is named Potemkin"

                                Comment

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