Narrative:

During cruise portion of flight; the enging torque indication began malfunctioning; giving erratic readouts that ranged from 0 psi to 70 psi; causing red and amber engine torque cas messages; both visual and aural. At one point; amber X's displayed on the engine torque display; meaning torque indications were unreliable. All other engine instrument indications were normal throughout the flight. Only engine torque was affected. The crew referenced the QRH once the red engine torque cas remained on and the engine torque displayed 70 psi. The QRH calls for a reduction in pilot controlled lighting and to land as soon as possible. The crew decided to divert to the next closest airport. Once the decision was made to divert; the passenger was informed of the diversion. The PIC contacted the [corporation] on the sat phone to inform them of the decision to divert to allow scheduling more time to find a recovery aircraft. The engine torque display continued to cycle from 0 psi to 70 psi throughout the descent and landing. The white engine exceedance cas displayed after landing.

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Original NASA ASRS Text

Title: The pilot of a PC-12 reported a malfunction of the engine torque indication that resulted in a diversion to a nearby airport.

Narrative: During cruise portion of flight; the enging torque indication began malfunctioning; giving erratic readouts that ranged from 0 PSI to 70 PSI; causing red and amber Engine Torque CAS messages; both visual and aural. At one point; amber X's displayed on the engine torque display; meaning torque indications were unreliable. All other engine instrument indications were normal throughout the flight. Only Engine Torque was affected. The crew referenced the QRH once the Red Engine Torque CAS remained on and the Engine Torque displayed 70 PSI. The QRH calls for a reduction in PCL and to land as soon as possible. The crew decided to divert to the next closest airport. Once the decision was made to divert; the passenger was informed of the diversion. The PIC contacted the [corporation] on the SAT Phone to inform them of the decision to divert to allow scheduling more time to find a recovery aircraft. The engine torque display continued to cycle from 0 PSI to 70 PSI throughout the descent and landing. The White Engine Exceedance CAS displayed after landing.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.