Why we set 910 TIT during the temp control checks on -15 engines flight manuals? 910 TIT is 70 degress higher than the highest crossover limit. The -7 engines have the same spread. I have spoken to several maintenance and Rolls-Royce representatives and the answer I get is if you are in the controlling range it doesn't matter what you set. I have read many maintenance job guide and old flight manuals all the way back to the 1980s and they all show 910. Does anyone know why it is such an odd number?
