Altimeter setting procedures
Which altimeter setting procedure do you use and under which authority do you operate?
1. Cleared to a flight level: Set standard on primary altimeter immediately. Leave secondary until through the transition altitude.
2. Cleared to a flight level: Set standard on all altimeters as you go through transition altitude.
3. Cleared to a flight level: Set standard 1000' before transition altitude.
I can see advantages and disadvantages to all three.