Low Oil Pressure
Lots of really good advice here... perhaps the most important being "don't be in a hurry to shut it down". I've had a couple of oil prex probs with PT6 engines...(Be1900) with the needle only just in the yellow arc (ie almost in the green). Remember that yellow is the CAUTION band.... but if the loss of pressure has resulted from gradual loss of oil, it will get worse! Speaking personally, if flying over any type of inhospitable terrain (including water) my preference was to keep the suspect engine at low idle and therefore immediately ready to return to work. (Even with props feathered, these things make lousy gliders if you lose number 2) Actions quoted above only of course if not covered by non-standard ops. ps: in each case above, problem was guage/sender bm