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#1
January 6th 04, 04:40 AM
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running with scissors wrote in
message om... "John Gilmer" wrote in message ... "Bob Gardner" wrote in message news:QODIb.85072$VB2.187788@attbi_s51... No way. You start off at sea level, of course, and they pump the chamber pressure down to 25000 feet with masks on...then they do some experiments with a few of the pilots taking their masks off, just to show how severely their abilities are affected. Then comes the explosive decompression, which takes the chamber from 25K back down to sea level in a second or two. SIlly question but ... Why would "they" pressurize the aircraft to sea level? Why not some compromise "pressure" like that equivalent to, say, 6,000 or 8,000 feet? EMWTK "they" dont. cabin pressurization is normally at 8000ft though crew may elect to use different cabin pressures under certain circumstances (eg medevac operations where pressurization is a factor) Sec. 25.1 Applicability. (a) This part prescribes airworthiness standards for the issue of type certificates, and changes to those certificates, for transport category airplanes. http://www.astech-engineering.com/sy...apart25d.html# Pressurization Sec. 25.841 Pressurized cabins. "(a) Pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 8,000 feet at the maximum operating altitude of the airplane under normal operating conditions." Transport category: * All jets with 10 or more seats or greater than 12,500lb Maximum Takeoff Weight. * All propeller driven airplanes with greater than 19 seats or greater than 19,000lb Maximum Takeoff Weight. Obviously the rule would not normlly apply to Medivac operations. HTH, Paul Nixon 
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#2
January 6th 04, 05:43 PM
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"khobar" wrote in message news:W_qKb.17919$7D3.14891@fed1read02...
running with scissors wrote in message om... "John Gilmer" wrote in message ... "Bob Gardner" wrote in message news:QODIb.85072$VB2.187788@attbi_s51... No way. You start off at sea level, of course, and they pump the chamber pressure down to 25000 feet with masks on...then they do some experiments with a few of the pilots taking their masks off, just to show how severely their abilities are affected. Then comes the explosive decompression, which takes the chamber from 25K back down to sea level in a second or two. SIlly question but ... Why would "they" pressurize the aircraft to sea level? Why not some compromise "pressure" like that equivalent to, say, 6,000 or 8,000 feet? EMWTK "they" dont. cabin pressurization is normally at 8000ft though crew may elect to use different cabin pressures under certain circumstances (eg medevac operations where pressurization is a factor) Sec. 25.1 Applicability. (a) This part prescribes airworthiness standards for the issue of type certificates, and changes to those certificates, for transport category airplanes. http://www.astech-engineering.com/sy...apart25d.html# Pressurization Sec. 25.841 Pressurized cabins. "(a) Pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 8,000 feet at the maximum operating altitude of the airplane under normal operating conditions." Transport category: * All jets with 10 or more seats or greater than 12,500lb Maximum Takeoff Weight. * All propeller driven airplanes with greater than 19 seats or greater than 19,000lb Maximum Takeoff Weight. Obviously the rule would not normlly apply to Medivac operations. HTH, Paul Nixon medevac ops are not exempt. though under certain medical conditions the cabin my not be pressurized or pressurized to a lower altitude. nitrogen narcosis is one condition that springs to mind.
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#3
January 6th 04, 07:11 PM
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running with scissors wrote in
message om... "khobar" wrote in message news:W_qKb.17919$7D3.14891@fed1read02... running with scissors wrote in message om... "John Gilmer" wrote in message ... "Bob Gardner" wrote in message news:QODIb.85072$VB2.187788@attbi_s51... No way. You start off at sea level, of course, and they pump the chamber pressure down to 25000 feet with masks on...then they do some experiments with a few of the pilots taking their masks off, just to show how severely their abilities are affected. Then comes the explosive decompression, which takes the chamber from 25K back down to sea level in a second or two. SIlly question but ... Why would "they" pressurize the aircraft to sea level? Why not some compromise "pressure" like that equivalent to, say, 6,000 or 8,000 feet? EMWTK "they" dont. cabin pressurization is normally at 8000ft though crew may elect to use different cabin pressures under certain circumstances (eg medevac operations where pressurization is a factor) Sec. 25.1 Applicability. (a) This part prescribes airworthiness standards for the issue of type certificates, and changes to those certificates, for transport category airplanes. http://www.astech-engineering.com/sy...apart25d.html# Pressurization Sec. 25.841 Pressurized cabins. "(a) Pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 8,000 feet at the maximum operating altitude of the airplane under normal operating conditions." Transport category: * All jets with 10 or more seats or greater than 12,500lb Maximum Takeoff Weight. * All propeller driven airplanes with greater than 19 seats or greater than 19,000lb Maximum Takeoff Weight. Obviously the rule would not normlly apply to Medivac operations. HTH, Paul Nixon medevac ops are not exempt. though under certain medical conditions the cabin my not be pressurized or pressurized to a lower altitude. nitrogen narcosis is one condition that springs to mind. I was thinking about medivac helicopters. Dunno why since medivac goes beyond helicopter operations. Oh well... Paul Nixon
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#4
January 7th 04, 12:05 AM
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"khobar" wrote in message news:QLDKb.17987$7D3.1116@fed1read02...
running with scissors wrote in message om... "khobar" wrote in message news:W_qKb.17919$7D3.14891@fed1read02... running with scissors wrote in message om... "John Gilmer" wrote in message ... "Bob Gardner" wrote in message news:QODIb.85072$VB2.187788@attbi_s51... No way. You start off at sea level, of course, and they pump the chamber pressure down to 25000 feet with masks on...then they do some experiments with a few of the pilots taking their masks off, just to show how severely their abilities are affected. Then comes the explosive decompression, which takes the chamber from 25K back down to sea level in a second or two. SIlly question but ... Why would "they" pressurize the aircraft to sea level? Why not some compromise "pressure" like that equivalent to, say, 6,000 or 8,000 feet? EMWTK "they" dont. cabin pressurization is normally at 8000ft though crew may elect to use different cabin pressures under certain circumstances (eg medevac operations where pressurization is a factor) Sec. 25.1 Applicability. (a) This part prescribes airworthiness standards for the issue of type certificates, and changes to those certificates, for transport category airplanes. http://www.astech-engineering.com/sy...apart25d.html# Pressurization Sec. 25.841 Pressurized cabins. "(a) Pressurized cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 8,000 feet at the maximum operating altitude of the airplane under normal operating conditions." Transport category: * All jets with 10 or more seats or greater than 12,500lb Maximum Takeoff Weight. * All propeller driven airplanes with greater than 19 seats or greater than 19,000lb Maximum Takeoff Weight. Obviously the rule would not normlly apply to Medivac operations. HTH, Paul Nixon medevac ops are not exempt. though under certain medical conditions the cabin my not be pressurized or pressurized to a lower altitude. nitrogen narcosis is one condition that springs to mind. I was thinking about medivac helicopters. Dunno why since medivac goes beyond helicopter operations. Oh well... Paul Nixon pressurized heli ?
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#5
January 7th 04, 12:29 AM
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running with scissors wrote in
message om... "khobar" wrote in message news:QLDKb.17987$7D3.1116@fed1read02... I was thinking about medivac helicopters. Dunno why since medivac goes beyond helicopter operations. Oh well... Paul Nixon pressurized heli ? Just a minor short in the headset. I had helicopters on my mind when posting the applicability part. Paul Nixon
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#6
January 7th 04, 05:20 PM
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"khobar" wrote in message news:aqIKb.18693$7D3.14245@fed1read02...
running with scissors wrote in message om... "khobar" wrote in message news:QLDKb.17987$7D3.1116@fed1read02... I was thinking about medivac helicopters. Dunno why since medivac goes beyond helicopter operations. Oh well... Paul Nixon pressurized heli ? Just a minor short in the headset. I had helicopters on my mind when posting the applicability part. Paul Nixon lol
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