When I wired the ARINC, I obviously used the Ex. Conn. pinout shown on the ARINC drawing, with serial #4 GND to pin 5. As I prepared wiring for a spare GPS puck (needs power from the 5V terminal in the Expansion Connector), I noticed that on the EFIS Main drawing, the Ex. Conn. shows serial GND to pin 2.

I realize that both pins are common to the chassis, and this is very 'late to the party', but if the drawings carry forward to current products, it might confuse someone doing a new install.

FWIW,

Charlie