While flying the above SID and STAR I encountered a few things that raised questions in my mind.
The scenario: I was departing KLAS RWY 19R per the SID and arriving KLAX per the STAR.
Prior to ROPPR (and climbing thru 3500'-4000') ATC issued me a "climb unrestricted to 19000'". I acknowledged the instruction, started the climb to FL190 while staying on the routing depicted on the SID. I believe that was the correct course of action.
Somewhere after HEC, ATC issued me a crossing restriction for a upcoming way-point ("cross XXX at or above XXX'"). I acknowledged the message and continued on at my current altitude. Upon reaching the point where I thought I should begin the descent to be able to "cross XXX at above XXX'", I began my descent. Questions/Clarification: When ATC gives me a crossing restriction am I allowed to begin my descent at my discretion? and do I advise/request from ATC prior to beginning the descent?
I'm not questioning or criticizing the controller's actions; I'm just trying to get things correct in my mind.
Thanks in advance,
P.S. Yes, The ZLA Pilot Certification IS making me a better pilot
P.S.S. Did you know that there is a RIVVR intersection in Michigan? My GPS had no problem with helping me to fly there..