When following the BEFORE TAKE-OFF CHECK LIST procedure, I happen to read this: Light & Strobes ........................... As Required Fuel Crossflow .......................................... Off IGNITION / ANTI-ICE ... .............. As Required Flight Attendant .................................. Advised Transponder / TCAS ........... ON / As Required Radar .......................................... As Required CAS .... ......................... Checked and Cleared Bugs ... .............................................. (Review) What does CAS stand for (CALIBRATED AIR SPEED, by chance)? Then, how can I set the Fuel crossflow to Off position?