And easy to demonstrate.
Fly a descent with an intermediate alt constraint such as the vile and odious FL270 by LIFFY. After LIFFY go direct to the next waypoint and the vertical profile goes from 0 to -3,000' or more.
Over the years you get to play with the machine and find out where it's strengths and weaknesses are - that is what makes a routine profession interesting again.
Striking a balance between ultimate economy and professional experimentation provides hours of endless pleasure and enables me to outwit our technical officer time and time again
