Bell 412EP run up snag.
Hi 412EP pilots and maintainers. A friend of mine was doing a run up on a 412 Griffon, and this is what was happening. One Power Section(PS) was at 71% N2, he went to roll up the other PS and the one at 71% dropped down to 61% essentially idle. He reversed the PS's and tried it in the reverse order, and the power section at 71% again dropped to 61%. PS are PT6T-3Ds. What is your take on this? Thanks.