Hi again =)
Whenever I switch APM to FLY mode (handle of the switch closer to DIP-switches) both boards (oilpan and ardupilot mega) got shut off! No leds, no ftdi virtual com-port in computer's device list. And the buffer chip(74act157 on APM board) getting really hot! When in CLI mode - it's all okay.
Also I've notice that on 3-pin connectors I have 4.9V at Signal Pin and 1.3V at + Pin. To clear some things - am I able to supply power to receiver from lets say IN8 or OUT8? I think all + and - are the same on this connector.