Originally Posted by
Airmann
No there are some errors in your statements
The PTU will only run when the P Brake is set to OFF not ON, i.e. when your moving, your second statement seems to get this right.
Precisely
Be careful on this one, look at the diagram, notice the shape of the box that contains the lines of the inhibit conditions (Y Pump is off, cargo door is operated). Its an AND gate, not an OR gate, meaning that the inhibit condition is when the Cargo door is operated AND the Y Pump pb is off, not either or, both have to occur at the same time.
Hi Airmen,
To understand, when the YELLOW ELEC PUMP switch is selected to OFF, selection is indicated when no lights are illuminated and the electric-driven pump is de-energised. It is automatically energised when the forward or aft cargo door lever is operated. So assuming if there is no electrical power available, (Yellow pump not energised) cargo door operation is done using the hand pump, in this case PTU is inhibited.
Also why did airbus remove the PTU inhibition diagram from the FCOM's.