• Bleed shift on PW4000.

    Look at duct pressure around 80% N2 while accelerating and decelerating. 

    As the engine slows down LP pressure drops off up to a point when HP air kicks in and drives the pressure back up again.
      
      
      
      
    For the write-up above..... that bleed shift did not happen in a timely manner. It finally shifted, but for a few seconds I'm sure there was some serious ass-puckering going on.
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