I have to say that one of the most unpleaseant tasks of PREFLIGHT inspection/cockpit is checking the oxygen system.
at an airline, you have the "cooties" (forgive the bit of fun) from the prior crew.
if it is YOUR king air, shouldn't be so bad.
BUT you must put the mask on, and check the flow and intercom if installed.
after the payne stewart crash, you would think people would check this.
it is interesting to note that the oxygen system worked when checked later on...I wonder how much training is given to the oxygen system at those well known sim schools?
I am very glad the crew made it out alive...but anyone who hasn't checked their oxygen system prior to flight is just asking for a problem...you might want to time how long to get the mask on and flowing under pressure and practice it with your eyes closed...also donning smoke goggles if seperate.