PT6A-27 Question
Hi all,
I've noticed that the turbine temperature indicator (T5) doesn't really change throughout the flight. It basically stays at some 650°C; altitude and airspeed don't cause a visible change although torque does change as it should with altitude variations. Anybody knows the reason? Thanks in advance. |
Perhaps because you haven't moved the power lever??
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Well, maybe, but doesn't OAT and all the changes that come with increasing/decreasing altitude, ram air and whatnot play a factor as well? :confused:
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Originally Posted by Escape Path
...Anybody knows the reason?
The fuel control unit adjusts fuel flow (Wf) in order to maintain whatever Ng set point that the pilot has selected using the power levers. As the aircraft climbs, fuel flow is reduced, and as the aircraft descends, fuel flow is increased - again, this assumes that the power lever is not moved. I can only guess that the reduction or increase in fuel flow is more or less proportionate to the reduction or increase in air density, and for that reason, T5 does not change significantly. Michael |
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