cunningplanmylord
16th Feb 2011, 12:33
Dear All,
I have been on the 747 for about 3 years now and only over the last 6-7 months have been accutely aware of what must be a low wave level of cycling vibration from the N1 fans.
It is audible at a relatively low and discreet level, but I think by far far the biggest issue is the level of resonant vibration that u feel cycling through the seat at a constant interval. This is particularly irritating and when spending nights out of bed tired on long haul night flights ; it is like chinese water torture !!
I have tried to sync the n1's as close as i can but does not really eliminate the problem, numerous pillows and cushions on the seat make no effect whatsoever. We always as pilots feel and expect vibration levels in the flt dck but it is the cyclical nature that causes the stress. Is there any other experience of this problem out there and a way/method to troubleshoot this or even cognitive ways of helping cope overcome a persistent and irritating problem, as im sure it affects only a minority of us ?
Many thanks in advance
CPML
I have been on the 747 for about 3 years now and only over the last 6-7 months have been accutely aware of what must be a low wave level of cycling vibration from the N1 fans.
It is audible at a relatively low and discreet level, but I think by far far the biggest issue is the level of resonant vibration that u feel cycling through the seat at a constant interval. This is particularly irritating and when spending nights out of bed tired on long haul night flights ; it is like chinese water torture !!
I have tried to sync the n1's as close as i can but does not really eliminate the problem, numerous pillows and cushions on the seat make no effect whatsoever. We always as pilots feel and expect vibration levels in the flt dck but it is the cyclical nature that causes the stress. Is there any other experience of this problem out there and a way/method to troubleshoot this or even cognitive ways of helping cope overcome a persistent and irritating problem, as im sure it affects only a minority of us ?
Many thanks in advance
CPML