leonard17F
23rd Aug 2014, 08:28
Hello fellow Ppruners
We have been recently experiencing some problems when trying to open our Main Entry Door from the inside on a pretty new Global 5000.
We could not open it 3 flights in a row, and it was also bit difficult to open it from the outside…..
However, once opened, it could be closed and re-opened relatively easily.
The outside temperature is very high, 38 degC ish, for 700ft elevation, with some humidity too…. (Density altitude is around 4500ft with QNH=1005hPa)
Does this sound familiar ?
It sounds like maybe a pressurization problem….Would it be reasonable to assume that the Auto FMS Pressurization schedule does NOT take into account the high OAT ? and therefore, the remnant pressure in the cabin (based on LFE only) is too low (also we cool it down to 22degC) and and therefore there is some differential pressure?
Also, with a high OAT, I believe that the outside pressure should actually higher than what it would be in ISA conditions, correct me if I am wrong…
Thanks for your valuable inputs, as always.
We have been recently experiencing some problems when trying to open our Main Entry Door from the inside on a pretty new Global 5000.
We could not open it 3 flights in a row, and it was also bit difficult to open it from the outside…..
However, once opened, it could be closed and re-opened relatively easily.
The outside temperature is very high, 38 degC ish, for 700ft elevation, with some humidity too…. (Density altitude is around 4500ft with QNH=1005hPa)
Does this sound familiar ?
It sounds like maybe a pressurization problem….Would it be reasonable to assume that the Auto FMS Pressurization schedule does NOT take into account the high OAT ? and therefore, the remnant pressure in the cabin (based on LFE only) is too low (also we cool it down to 22degC) and and therefore there is some differential pressure?
Also, with a high OAT, I believe that the outside pressure should actually higher than what it would be in ISA conditions, correct me if I am wrong…
Thanks for your valuable inputs, as always.