Originally Posted by
steve_oc
LTNG is the soft key to select Lightning Sensor overlay (in a similar way to TCAS). The Honeywell lightning sensor is an option on the S92. Sorry HC, it's not the selected nav source.
Oh yes, I just saw it at bottom centre of the screen showing the mode was active. If I had also noticed it adjacent to the soft key, next to TCAS, WXR, TER I would have guessed better!