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29th Jul 2014, 23:23

#2 (permalink)

Exaviator

Join Date: Mar 2009

Location: Kerikeri, New Zealand or Noosa Queensland. Depending on the time of year!

Age: 84

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It is a long time since I last flew the B-747 but if my memory serves me correctly the purpose of the Dump Valve is to over ride the control of the Out Flow valves and drive them to the full "Open" position, thereby depressurising the aircraft.

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