Originally Posted by aviatorpr

Please explain to me why at class C and D airports, more than 50% of the time I have to inform the tower we are ready for departure when holding short. The AIM says turbine aircraft do no have to tell the tower. 4-3-13 section b
"The tower controller will consider that pilots of turbine−powered aircraft are ready for takeoff when they reach the runway or warm−up block unless advised otherwise."