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How to Check for NTS in a Breaker

The Negative Torque Signal (NTS) is used to limit the engine from overspeeding and to keep the propeller from developing negative torque because of air gust loads, temporary fuel interruptions and normal descents with lean fuel. The NTS light in the cockpit can go on for a number of reasons, including when it's time to increase the propeller blade angle. This system has to be checked regularly and the breaker system is included in the checklist. If the NTS light does not illuminate, a troubleshooting procedure is followed.

Instructions

- 1
  Press the test button on the master light to see if it burned out, according to e-codestar.com. If it is not, make sure the condition lever is in the ground stop position.
- 2
  Confirm that the power lever is pressed down to the flight idle gate. Make sure the fuel and the ignition circuit is fully depressed. The right air ground safety circuit breaker should be turned on.
- 3
  Confirm that the NTS check solenoid breaker is pressed and turned on. Toggle the NTS check switch four times.
- 4
  Undo the turtleback cowling and then remove it. Check the two NTS bracket gaps. Then check the feather solenoid. If it retracts, see if it will go further. If it does go further, check the rigging. If it does not retract, the wiring must be checked. If there are no wiring issues, change the solenoid.

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