Chuck
When instructing often the only way to know what your student is thinking/doing is for them to verbalize it. Therefore I require them to makr the following calls on Takeoff. ( in a typical non turbo light twin )
1. In position: sweep engine and vacuum/electrical guages by pointing with their finger in a quick but complete circuit then call
" Two good Engines "
2. When the throttles reach forward stop , scan MP and RPM guages and call " Full Power "
3. At 70 Kts observe airspeed and MP. RPM, Oil Pressure guages and Call " 70 Knots, two good engines "
4. At rotation speed call " rotate "
5. At blue speed call " blue line , positive rate , gear up "
( note I consider blue line with the gear selected up as the decision speed as IMO it is unsafe to attempt to continue the takeoff with the airspeed below blueline close to the ground ).
Obviously these calls would not be verbalized in the context of single pilot commercial operations but I believe they are the best way to conduct training as they keep me in the loop and pedagogical theory has proven verbalizing actions helps students learn. Anyway to answer your questions, they are "required" because I am the PIC
