In Range Checklist
[G450 Airplane Flight Manual §2-05-40]
- Altimeters (3) . . . SET & CROSS-CHECKED (AT TRANSITION LEVEL)
- SEAT BELT . . . AS REQUIRED
- EXTERIOR LIGHTS . . . AS REQUIRED
- Flight Observer Seat Position / Interior Doors . . . CHECK
If you have a low altitude transition level, using the electronic checklist's "Defer" option can help remind you when the time comes to leave 1013.
Most operators use 10,000 feet to do this. Some have passengers who come up to the cockpit and say "Let me know when I really have to sit down," or who just ignore the thing altogether.
We get the pulse lights at FL 180.
Gulfstream G450 Airplane Flight Manual, Revision 35, April 18, 2013