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Above fl 350 wing anti-ice could also cause a bleed trip off with both bleeds working.
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I have seen this info elsewhere twice and it was also stated that you can even lose pressurization of the aircraft , when this happens, now where is this source stated officially by Boeing ?
Zenj
QRH BLEED TRIP OFF June 6,2003
"CAUTION : Use of wing anti-ice above approx FL350 may cause bleed trip off and possible loss of cabin pressure.
hope that helps...