When does the igniters and boost pump deactivate during engine operation?

The igniters and boost pump deactivate during engine operation at 50% N1. This is a crucial aspect of engine management in the T-6A, as the igniters are used during engine start and up to a certain point in the acceleration phase to ensure that the fuel-air mixture ignites properly. Once the engine reaches 50% N1, it is considered that the engine has achieved a stable operating condition where the likelihood of flameout is minimal, allowing for the safe deactivation of the igniters.

The boost pump is used to ensure adequate fuel flow during start and low power settings; once the engine is producing sufficient thrust and has stabilized, the boost pump can be turned off to reduce unnecessary fuel flow and electrical load. Understanding these parameters is vital for effective engine management and ensuring smooth operation during different phases of flight.