Before moving the PCL above idle during an airstart, N1 must stabilize at what percentage?

During an airstart of the T-6A, it is essential for the engine parameters to be closely monitored to ensure a successful restart. The correct percentage at which N1 must stabilize prior to moving the Power Control Lever (PCL) above idle is 67%. This stabilization indicates that the engine is achieving a velocity necessary for combustion to take place effectively and to ensure that the engine can handle the increased power demand safely when the PCL is moved out of the idle position.

Moving the PCL too early can lead to engine complications such as a stall or failure to maintain the required engine parameters. Stabilizing at the specified N1 percentage helps confirm that the engine is ready to accept the additional power necessary for normal flight operations. This procedure is crucial to enhancing engine reliability and overall safety during the airstart process.