A340 Depressuriz(s)ation
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A340 Depressuriz(s)ation
Hi Folks:
Does anyone have any decent figures or charts concerning oxygen supply following a decompression? We used to have a graph correlating altitude/bottle pressure/pax but has since disappeared from our FCOMs. We have escape routes in the event of depressurization but I think they are too general regarding configuration (some airplanes have 5 or 8 bottles), bottle pressure, and pax numbers. We carry 2 bottles for the cockpit. Could anyone confirm that the crew and pax bottles are the same size. If so who is more critical: potentially 287 pax requiring oxygen to 14000 feet with 8 bottles; or potentially 4 crew requiring oxygen to 10000 feet with 2 bottles? I understand that time at altitude will be critical, but where is the crossover point between crew and pax?
Could any other 340 operators post their depressurization SOPs?
Cheers
Does anyone have any decent figures or charts concerning oxygen supply following a decompression? We used to have a graph correlating altitude/bottle pressure/pax but has since disappeared from our FCOMs. We have escape routes in the event of depressurization but I think they are too general regarding configuration (some airplanes have 5 or 8 bottles), bottle pressure, and pax numbers. We carry 2 bottles for the cockpit. Could anyone confirm that the crew and pax bottles are the same size. If so who is more critical: potentially 287 pax requiring oxygen to 14000 feet with 8 bottles; or potentially 4 crew requiring oxygen to 10000 feet with 2 bottles? I understand that time at altitude will be critical, but where is the crossover point between crew and pax?
Could any other 340 operators post their depressurization SOPs?
Cheers
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Well, when I flew A340s we had different setups. There were aircraft (A343) equipped with O2 generators, and actually there were different types installed: One was burning for 15min, the other ones for 22 min, if I recall correctly. Then there was the A346, which had a stationary oxygen system, and that was also boosted on some aircraft by adding bottles to be able to fly L888 (Almaty <-> Chengdu).
So first you need to describe the system your A340's got, and if it is bottles, you have the pressure indicated on the SD.
But the cockpit O2 should always last longer than the Pax O2, as they can survive in a dazed state of mind for some time, but concentration will be impaired in the cockpit at, say 14000' .
Nic
So first you need to describe the system your A340's got, and if it is bottles, you have the pressure indicated on the SD.
But the cockpit O2 should always last longer than the Pax O2, as they can survive in a dazed state of mind for some time, but concentration will be impaired in the cockpit at, say 14000' .
Nic
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The aircraft in question is a 343 with 5/8 bottles for pax, 2 for crew. Minimum dispatch pressure 1500psi. Pax off oxygen at 14000 feet, crew on masks until 10000 feet.
