737NG Stuck PRSOV?
Need some help here:
Flying in the NG -700, and noticed upon descent a major decrease in airflow in the cabin. This correlated with engine thrust, low airflow until we got a level off. Power was increased and consequently cabin airflow increased. I could not see if it was a duct split as i was in the cabin. I do know of the 5th to 9th stage changeover at 40% N1. But this was not a regular event in that the cabin flow rate was not consistent with this. I wonder if it was a stuck PRSOV, do not know if it was an MEL issue.
Looking for your wisdom...
Jason S.