Originally Posted by
Airplane Crazy
By the way side slip is when your airplane is not flying straight. It's flying sideway when you are trying to lose altitude. Forward slip is when your airplane is flying straight for example when you are doing a corss wind landing. Although you are using rudder your longitudinal axis of the airplane is aligned with the runway. Plus go by things your instructor tells you that way if the examiner finds you wrong you might just get to slide. Some times if you say something wrong and you can prove you were tought it wrong like this examiner will let you slide saying ok I'll tell you the right way and from now on go by my way. That happened to a friend of mine.
http://en.wikipedia.org/wiki/Slip_(aerodynamic)
Wrong, forward slip is to lose altitude, side slip is to correct side drift while keeping the longitudinal axis aligned with the runway.
If you were taught something wrong, your instructor can expect to get an earful from the examiner. At the CFI level, you better be able to backup all of your answers with textbook or regulation references. There isn't much of an execuse for being taught something "wrong" at the CFI level. Technique issues are a different story.
As far as the CFI ride goes, relax, its just another flight. My ride was a breeze, so maybe you'll get lucky.