King Air 90 Question
04-01-2009, 05:16 AM
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King Air 90 Question
I fly and manage a King Air 90 for a medical group the aircraft had some pressurization leaks which have been corrected and it now makes max diff with out a problem. My question which is how tight the cabin on other C-90’s? This one will maintain a cabin altitude of less then 10K all the way up to FL260 with out a problem but it will descend at 1000 FPM if you are near flight idle which happens with the chop and drop if ATC keeps you real high.
This C-90 has the Blackhawk -135A engines on it
Thanks
This C-90 has the Blackhawk -135A engines on it
Thanks
04-01-2009, 05:47 AM
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I can not speak for the Blackhawk conversions but I can speak for new C-90's as they leave the factory. So keep in mind that an older c-90 may not be as tight. The leak rate, meaning both bleeds off, at 4.5 psid should be under 3000 fpm. This of course checks how good is the pressure vessel. As for the power idle check this is a check of the flow packs and the aircraft should hold max psid single sourced, meaning only one bleed on, all the way down to 85% N1.
As I have stated this is on new aircraft as they leave the factory, older aircraft may not be able to hold this.
As I have stated this is on new aircraft as they leave the factory, older aircraft may not be able to hold this.
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