Communication system

Would you happen to know which component of the communication system corresponds to part number 700-D41000B, and furthermore, how this component differs from the one identified by part number 700-D41000G?

I think you're getting into component level repairs.

That part comes up as a Gables "Switch Shutter Wheel".

Gables makes VHF Communication Control Heads and Audio Selector Panels.

Repairs of these components is done in qualified and certified repair shops.

Line maintenance replaces these units when needed, but we do not open the panels up for internal repair.