During a No Light Off condition, what should be done first?

In the case of a No Light Off condition during engine start, the first action is to shut off the affected thrust lever. This step is crucial because a No Light Off condition indicates that the engine has not started successfully, and fuel may still be flowing into the engine without combustion. By shutting the thrust lever to the cutoff position, you prevent further fuel from entering the engine, which reduces risks such as potential engine fire or damage, and it ensures safety during the malfunction.

Taking this action first allows the crew to manage the situation effectively by stopping the flow of fuel before proceeding to other necessary steps, such as initiating ignition or dry motoring the engine. Prioritizing the shutdown of the thrust lever protects the aircraft and ensures that safety protocols are followed. After managing the thrust lever, other procedures can be undertaken as necessary, ensuring an orderly and safe response to the incident.