Originally Posted by
asdf
Just because the FAA lets you write in limitations to a endorsement, doesn't mean you can go willy-nilly with it. Theres limits you what you can limit.
Say, for instance you are teaching out of an airport where there is a grass strip as well as a paved strip. You decide to keep the student on the pavement until after the solo stage. When you sign him off for the solo, you can write in there that he must stay on the pavement runway. This is fine because grass landing operations is not something thats listed in 61.87. On the other hand, writing in a restriction that basically renders the endorsement useless is not quite the same thing.
Do you have a referece to support this opinion? FAR 61.89(a)(8) states that "A student pilot may not act as PIC of an aircraft in a manner contrary to any limiations placed in the pilot's logbook by an authorized instructor".
That sentence makes it clear that an authorized instructor has the right to limit the activities of a solo student. Nowhere in that reg does it suggest what you are saying above.
Call the FAA. Notify the piloce. Talk to the student. I don't know. If you student has gone all "Mr Hyde", then it's not likley he's going to let you write on his logbook anyways, so I don't see what nullifying the endorsement is going to achieve anyways...
What it achieves is covering myself when the student's family decides to sue me for the student pilot killing themself doing something stupid. I can make a clear case that I revoked the student's solo privilages as soon as I became aware they were doing something illegal or unsafe while soloing. At that point, if they decide to go solo again, it's on them as they are now flying without any certificate and without the CFI authorization required by the FARs.