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Thread: B767 bleed fault (HPSOV)
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Old 30th October 2012 | 16:14
  #10 (permalink)  
Beeline
 
Joined: Jul 2007
Posts: 186
Likes: 1
From: UK
If the servo muscle air cannot be ported to ambient it will keep the valve open.

Most/all HPSOVs spring loaded to fail safe closed. Have known blocked vent ports to cause this issue especially on handling bleed valves.
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