Originally Posted by
42go
The latter makes it clear that, with the gear selected down, the only thing that prevents hydraulic pressure extending the gear is an electronic input of IAS of 260 kts or more.
Well yes, it's generally understood that the inputs to an AND logic gate are electronic.
I suppose we ought to add the possibility that the IAS inputs (from both ADR1 and ADR3) were corrupted to the list of progressively less likely, though theoretically possible, reasons why they landed with the gear up.
Now where did that Occam's Razor go ?