What happens if the PCL is not turned off during a start in an airstart procedure?

In the context of an airstart procedure for an aircraft, if the Power Control Lever (PCL) is not turned off, fuel may be prematurely introduced into the engine. This is crucial to understand because proper engine start procedures often require the PCL to be positioned correctly to ensure a safe and effective start.

When the PCL remains in a position that permits fuel flow, it can lead to an unintended introduction of fuel into the engine before the conditions are right for combustion. This premature introduction can result in fuel pooling or flooding, which can hinder the ignition process and potentially lead to a failed start or other performance issues.

Therefore, managing the PCL appropriately during the airstart procedure is vital to ensure that the engine starts smoothly and with the correct sequence of fuel flow and ignition. Understanding the implications of not turning off the PCL solidifies the importance of adhering to established procedures for engine starts, particularly in critical phases of flight like an airstart.