Tristarsteve wrote:They probably have a problem with the pax oxygen system. There is much of the area where you cannot descend immediately to 1000ft if required. Therefore you must have an enhanced oxygen system that works for longer than 20 minutes. Our B777 and B744 had the fwd cargo filled with oxygen bottles (behind the sidewall and in the roof) to enable direct flights over the himalayas (and Greenland). Perhaps these airlines find it easier to go round?
BravoOne wrote:I would imagine that like others have stated, this is a pax oxygen issue combined with Minimum Sector Altitudes that surround the Hindu Kush regions. Most Jeppesen tailored high altitude enroute charts, will have "escape" routes printed them should you lose an engine and start a drift down. That combined with your oxygen supply will determine your course of action. Recall that the worst case scenario usually involves a combined engine loss along with a decompression, hence the decent to something lower than 10,000. If the MEA or MSA is above 10,000 you need O2 until you can get lower. As I recall you do not need O2 for every pax but rather a percentage value.
Boeing offer extended capacity O2 canister that last for 25 minutes as opposed to the 15 minute standard versions. Not positive about those numbers so don't call me on it. They also offer a gaseous O2 system with extended capacity on some models.
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