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Old 5th August 2011 | 06:32
  #25 (permalink)  
NSEU
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From: Australia
For reference...

The negative pressure relief valves on the cargo doors on, say, a B747-400, crack open at 0.2~0.4psi. On the 767, it is 0.3~0.5. The 737NG is a little higher with 1.0psi.
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