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It is my belief that the following happens:
The pump cannot transfer fluid fast enough to all the cylinders demanding it. The "door down" springs push open until a pressure equilibrium is reached because of the hi fluid demand of the large cylinders - especially the nose gear because it also is strongly pushed out by the gas spring. Once the flow demand is met by the nose gear fully out and the mains almost fully down, the smaller door actuators fluid need is satisfied and they can finish opening. This is why 320/360 partially open nose gear doors get slammed by the gas spring pushed nose gear during extension. The 320/360 main gear door geometry is slightly different than the Legacy, thus they don't get hit but usually stall partially open for a while during the down cycle. I know that the Legacy uses a mechanical nose gear door opener.
See what happens during the "emergency" extension -- the hydraulic logic (fluid pathways) are different for the Legacy and 320/360s.
Have helpers push somewhat against the mains to retard their extension slightly and see if the doors fully open.
Scott Krueger
N92EX - a 320.
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