Hello, I was wondering what does the test switch to the right of the IND lights knob on the overhead panel do (Sorry I don

"Hello, I was wondering what does the test switch to the right of the IND lights knob on the overhead panel do"Basically, it illuminates every indicator light in the cockpit... and puts up test displays on the EADI and EHSI. It's simply used to check that the bulbs are working properly.It's often used by maintenance.http://members.ozemail.com.au/~b744er/767/EADITesta.jpgCheers.Ian.

Yes, We pilots use it to perform a lights check on preflight. Or just to see what it looks like when things really go wrong.Will