From the training manual:
On the AW139 helicopter, the torque limiter function is set to OFF as default.
If the pilot wants to engage the torque limiter function, the TQ LIM push-button
on the collective grip, must be pressed. After selection, the green advisory
message TQ LIMITER ON will be displayed in the CAS window.
When the torque limiter function is set to ON, the AEO total torque will be limited
to be combined torque value of TQ 228%. The OEI engine torque will not be affected.
When pressed a second time, the torque limiter function is deactivated and full power is available from engines.
To perform the OEI TRAINING, the TQ LIM function must be set to ON.