It is in fact the Nr beep switch (momentary On) and the missing one is the starter switch ...
Starter switch marked LDG L?
Rhys 01
That panel you have is a little screwed up. The square knob should be on the landing light switch. The one missing.
The N2 Trim (Beep) had a curved serrated knob.
FYI the starter button is on the very end of the collective.
On the 600N (on which I had the misfortune of being the engineer on the second one in service) they replaced the N2 Trim with the FADEC Manual Switch.
Can you imagine a pilot who was a habitual N2 beeper hitting that switch? (Not me) A few seconds delay and all of a sudden MAX Fuel Flow! Overspeed anyone?
Mentioned it to the MD people to be met by a blank stare! Mindless!
Zoom in on this puppy -
Link -
http://farm8.staticflickr.com/7257/7...1159a7fe_z.jpg