Pete,
On the PIC overhead panel there are the 2 electric/2 engine hydraulic pump switches and the 3 hydraulic demand pumps knobs. If I push the switches off and turn the knobs to off, hydraulic pressure drops from 3000 psi to 100 psi (as shown on seconday eicas). If the FSUIPC spike boxes are not checked, I won't be able, when I press the num keypad keys, to move the surfaces, and the controls indicators on the secondary eicas remain stuck in the centered (neutral) position.
Then I go to the FSUIPC interface and check the spikes eliminating boxes, without doing anythig else. I try to move the surfaces with the keyboard and they again move smoothly to full excursion as if hydraulic pressure was 3000 psi. More, if I check just one box, say ailerons, only ailerons will move and the other surface will remain stuck to the neutral position.
I understand the logic of spike elimination, and I can't understand why this happens.
Thank you very much for your support.
James