Consistent long, cool starts (35 seconds or more) can be detrimental to the gas producer turbine life. Remember that the temperatures indicated on the TOT gauge are interturbine, between the gas producer and power turbine, and may not reflect the temperatures being experienced by the first stage turbine nozzle and first stage turbine wheel. The quick, warm starts recommended by Allison actually increase cooling air flow in the combustion section to help insulate the gas producer turbine.
Thats the one, don't need a copy but thanks anyway. Always surprised me that simple explanation isn't included in the flight manual. It's nice to know the reason why one does something.
Thanks