IberiaMD-87
Astronaut
Es existieren wage Meldungen, dass ein Boeing 747-Frachter von Asiana Cargo vermisst wird. Einen brauchbaren Link fand ich noch nicht.
Gruss
Gruss
Allerdings ist schwer einzuschätzen, wie weit das Feuer bereits vorgedrungen ist. Es ist ja gar nicht bekannt, ob es der Rauch war oder ob alles so doll brannte, dass das Flugzeug in zwei Teile brach.Bei den zur Verfügung stehenden Zeiten nach Feuerausbruch (±15 Minuten!) müssen vielleicht auch neue Procedures her - abhängig von der Ladung:
Eine Notwasserung bei Nacht bringt unter Umständen größere Überlebenschancen mit sich als in irgendeiner unkontrollierten Lage bei hoher Geschwindigkeit aufzuschlagen, weil man im dichten Rauch die Instrumente nicht mehr sehen konnte.
Das sollte man meinen, die Hitze, die in solchen selbstversorgenden Flammen entsteht ist aber nicht zu verachten. Die SAA 747 "Helderberg", die unter ominösen Umständen vor Südafrika abgestürzt ist, hatte vermutlich Sprengstoff oder mit Treibstoff bestückte Raketen an Bord. Das Feuer war so heiss, dass die Farbe von der Aussenhaut geschmolzen ist, trotz "Kühlluft".Ich kann mir nicht vorstellen, dass das Flugzeug durch das Feuer so schnell zerbricht, da der Massenstrom an vorbeigeführter "Kühlluft" doch recht gut die auf der Aluhaut einigermaßen gut verteilte Hitze abführen kann...
undUsing a steel test chamber to simulate an aircraft cargo hold, the FAA tests show that a runaway fire involving a shipment of lithium batteries might well result in loss of the aircraft. The batteries involved were those used commonly in consumer electronic products (e.g., video cameras).
Batteries were tested singly, and in groups of 32, 64 and 128. Tests also involved groups of batteries packed in rows inside cardboard boxes.
For test purposes, the battery fires were started by igniting a "fire pan" filled with alcohol. The findings were fearful. To summarize:
* A relatively small fire source was sufficient to start a lithium battery fire.
* The heat from a single battery afire was sufficient to ignite adjacent batteries.
* The outer plastic coating on the batteries easily melted, fusing the batteries together, adding to the intensity of the fire.
* The chain reaction ignition continued until all batteries were consumed.
* The molten lithium burned explosively, spraying white-hot lithium to a radius of several feet as the batteries bounced around.
* The duration of the peak temperature increased with the number of batteries, reaching as high as 1,400[degrees] F (as a matter of interest, the melting temperature of aluminum is around 1,200[degrees] F).
* The cardboard packing proved highly flammable. The packing delayed battery ignition by about 30-60 seconds, but once ignited, the fire among the close-packed batteries was worse.
* While thick-wall cargo liners were able to contain the fire (barely), thin-walled fire liners proved ineffective. The battery fire ignited the resin in the liner, and the liner was completely penetrated by molten lithium.
* Halon fire-suppressing agent, injected in sufficient concentration to "knock down" a fire, proved totally ineffective, even when injected after just the first battery had caught fire. Nor did it have any effect on the peak temperature. The fire continued as if Halon were not present.
* Lithium batteries catch fire with explosive force. When they burst, they create a pressure pulse. The eight-battery test produced a pressure pulse of 1.8 psi, and the 16-battery test generated a 2.6 psi pulse.
According to the Tech Center report:
"These results are significant. The cargo compartment is only constructed to withstand a 1-psi pressure differential in order to rapidly equalize the pressure in the event of a depressurization. Anything over 1 psi would activate the blowout panels, compromising the cargo compartment's [fire-resistant] integrity."
The effect is the same as perforating the cargo liner.
* A cargo bay fire from a totally unrelated source can cause a shipment of lithium batteries to ignite. Tech Center investigators found that the temperatures found in a suppressed smoldering cargo fire are sufficient to ignite a lithium battery.
Mehr unter:The examination of lithium battery fires was undertaken after a pallet of such batteries caught fire on the ground at Los Angeles International Airport in April 1999. The pallet was inadvertently dropped onto the tarmac, and a battery fire resulted, despite there being no external ignition source. There are no confirmed reports of bulk lithium battery fires in the air, but that is precisely the reason the FAA Tech Center undertook its examination of this more dangerous scenario. There is one case where a lithium battery fire may have played a role in the crash of a transport category airplane. In November 1987 a South African Airways B747 combi (a hybrid freighter with a partition separating cargo from passengers on the main deck), with 159 passengers aboard and cargo which included a consignment of lithium watch batteries, disappeared into the Indian Ocean off Mauritius.