cold & dark

[Jean tardiff]

When you are starting up your plane from a cold and dark state, do you do this connecting ground power or using the APU. I think most pilots would use ground power.

Most videos on youtube seem to do this with APU 

[BjornMa]

Depends on airport regulation (and company procedures), due to environmental impact (and fuel usage) from the APU. Most modern airports today have fixed electrical ground power to minimize the use of both the APU and the GPU. You would then start the APU before startup.