Hank Birofski
You will use more fuel as the engines stayed at a crz pwr setting for longer
Yeah well, it doesn't really work this way, does it?
1) u sure wanna stay at those cruise level as long as possible, as these are the ones where u burn little fuel
2) if u fly the bus, u will have observed that following a profile descent, despite the IDLE FMA indication, still gives you some thrust (look at the N1 or EPR depending on engines) during the descent, thereby burning thrust to keep those misery 251kts (its what we had last nite...).
Conclusion: to save fuel climb as quickly as u can to the cruise level and stay there as long as u can. And if permitted, descend as steeply as u can, ideally switch the engines off
Remember, jet engines are optimized for hi level cruise, not lo level loitering
live 2 fly 2 live