What occurs if there is a no light off condition in a jet engine?

When there is a no light off condition in a jet engine, it means that the fuel-air mixture has not ignited during the engine start sequence. This situation results in the engine failing to ignite fuel effectively. Ignition is critical for the operation of the engine, as a successful light off indicates that combustion has begun properly. Without light off, the engine cannot generate the necessary thrust or operate as intended, leading to this failure of ignition.

The other scenarios involve different aspects of engine operation. For instance, an engine that starts but runs rough typically indicates that ignition occurred but the engine is improperly balanced or has other issues. An engine that ignites but fails to stabilize has started combustion but is unable to maintain a steady flame due to instability in the combustion process. Lastly, an engine operating at reduced power implies that ignition has occurred, but the engine is not performing at its full capacity, which is not the case in a no light off situation.