Originally Posted by Regularguy

You might inform us how lCAL enforced this.

Here’s another spin on this SOP; the 737 goes to smaller stations with less qualified staff. To either shutdown or start the APU requires special cockpit training which adds some issues, the biggest is cost and right behind that is security.

It’s cheaper (as in manpower) to give all the airplane shut down duties to a pilot rather than train someone locally to do it.