C/O button?

[fsgeek 0]

I'm not sure if this has already been asked, but does anyone know what the C/O button on the MCP does? I've looked in the operating manuals and I can't find anything on it.Regards,

[Ed van de Vijver 2]

What Google can do for you:C/O ButtonThe Change Over button is used to toggle the speed display between IAS (Indicated Airspeed) andMACH (Mach Number) readout.

[fsgeek 0]

Thanks Ed, I did check google but I found nothing :(

[kevinh 409]

It's the changeover button. Allows the pilot to manually switch between Mach and IAS modes. See FCOM V2, page 4.10.2Kevin Hall

[davierosoft 13]

Use it above FL260 when the VMO changes to MMO.