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NTS switch


Great Above
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6 hours ago, Great Above said:

1.   Pls why do we perform NTS checks on the C130?

2.   Why do we place the NTS/Valve switch to NTS before engine shutdown

1. The in-flight test is to ensure the NTS input is set at a correct value so that after in-flight shutdown and attempt to airstart the propeller will decrease blade angle at a controlled rate. As the prop drives the engine, NTS will cause the blade angle to increase "slowing" the prop. This will continue until the engine is on speed and driving the prop.

2. The NTS "test" on the ground is to ensure the NTS input to the prop is validated. When the engine is shutdown by going to Ground Stop neg torque is generated and moves the reduction gear box plunger forward, actuates the NTS bracket and valve housing linkage inside the valve housing. The NTS switch confirms all the movement by illuminating the NTS light.

With the throttles are in the ground range, the throttle dictates the prop blade angle. During the NTS test prop blade angle will not change only the movement of the NTS linkage is monitored.  

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