Throttle Settings
Having never flown a jet aircraft (yet), I've often wondered why on t/o the throttles are opened to about 70% for a few seconds before t/o power is called. Is this to carry out a quick instrument check, make sure all is well in manual mode before selecting autothrottle or is there a physical engine performance reason such as allowing the ground /air speed to build before opening the taps ?
Apologies for the dumb question but I've often wondered why.