747-400 magnetic switching in cockpit

[Blake H]

Oh we'll I have interface the switches now no going back. Maybe I can program them for my msfs Cessna 172 auto brake system when I think it is a good idea to turn the cockpit in a Cessna for a laugh. The horror of it. I must be sick  

Got it PSX, micro switches not required cheers.  

[Hardy Heinlin]

If you work with PSX, your autobrake selector snapper shouldn't be connected to your pedals but to an interface with PSX. PSX sends the snap command according to aircraft system events.

[John H Watson]

Oh we'll I have interface the switches now no going back

Blake, even if you could generate a PSX pedal angle by a single point switch on the pedals, you would still need an angle sensor on the hardware pedals for normal manual braking. This kinda makes the single point switch redundant.

Without practical experience on these systems, it would be impossible to say at what pedal angle the rollout (landing) autobrakes are disarmed. I read that brake pressure is proportional to pedal pressure. However, there are no springs on the pedals themselves, but in the brake hydraulic metering valves in the wheel wells. There are input springs and hydraulically assisted feedback springs which generate pedal forces, so it wouldn't be easy to compute the brake pedal angle required to trip the autobrakes.

[Blake H]

I have installed 10k high quality linear wiper pots geared to the brake pedals and the micro switches are also wired. I wired the micro switches before I read the post above. Both go to their respective I/o card.