Derek Ruddock wrote:
From memory isn’t the ‘standard’ pressurisation height 8000 feet?
There are two things here:
1. The maximum pressure differential allowed for the aircraft
2. The cabin is pressurised by compressor bleed air from the engines and
for fuel economy you want to minimise the amount of bleed air you use,
In the Boeing 787 they are going to not use compressor bleed air for
pressurisation but use electrical power from the engine driven
generators to drive electric motor driven pumps for pressurisation. No
doubt somebody did the sums on that correctly , I hope.
I know of one airline captain who went to work with a cold and to
prevent problems with his ears he found that by limiting the altitude to
FL190 he could safely pressurise the cabin to sea level. So everyone in
his jet weet to their destinations at FL190 that day. Just burned a bit
more of the employer's fuel.
Mike
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