Couple of points from previous comments.
1. Al's Caravans operate to a lower 'Normal Condition' ITT temp limit. Much lower than the 'book' limit.
2.Increasing the voltage during a external power start only benefits the engine by getting the engine past self sustaining RPM faster thereby reducing the peak temperature.
3. BackdoorBandit - Your opinion of The Caravan Operation to which Al is involved in is clearly limited. Maybe your too young or maybe have a bone to pick however only a few operators have actaully invested in Capital to bring these much newer aircraft into skydiving operations. This has result in the whole operation being conducted with a lot more professionalism from engineering through to flight operations. Maybe get the movie Fandango, Now that is what skydiving used to be. Thanks to Al and a few other operators it's a whole different scene.
4. Home grown IFR approaches. Simple, no one is forcing anyone to use them. If you use them it's illegal in IMC and you better know what your doing. It's up to the pilot not the aeroplane owner to determine what risks they are willing to take. I know Al does not want his plane driven into the side of a hill and Im sure all the people that come through the operation are respected for saying no if they are not comfortable with the conditions.