What action should be taken if a low energy state is reached at low key during an engine failure?

In the event of reaching a low energy state at low key during an engine failure, delaying flap extension is the appropriate action. When the aircraft is in a low energy state, it means that the aircraft does not have sufficient airspeed or altitude to maintain controlled flight or to execute a safe landing. Extending the flaps too early can increase drag, further reducing airspeed and energy, which can lead to an inability to control the aircraft properly. By delaying flap extension, the pilot can maintain a more optimal speed and energy state, allowing for better control during a critical phase of flight.

Proper management of the aircraft's energy state is essential, especially during an engine failure where every bit of lift and control is crucial. Maintaining a higher airspeed before extending the flaps will help ensure that the pilot can safely maneuver the aircraft to achieve a suitable landing, rather than risking a stall or losing further altitude due to increased drag.