737NG Stuck PRSOV?
Thread Starter
Joined: Sep 2014
Posts: 1
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From: Utah
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.
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.
Joined: Mar 2007
Posts: 570
Likes: 21
From: Another Planet.
If when you are doing the external check, with the APU running and delivering air to the packs, can you hear air hissing if/when you stick your head in the intake of either engine?
If so, a good clue to the ground engineers that something is wrong in the PRSOV dept, IIRC?
If so, a good clue to the ground engineers that something is wrong in the PRSOV dept, IIRC?
