During an engine start, if fuel flow is at 450 PPH with no increase in EGT after twenty seconds, what should you do?

When the fuel flow during an engine start is observed at 450 PPH with no increase in Exhaust Gas Temperature (EGT) after 20 seconds, performing the stop start and engine clearing procedures becomes necessary. This is indicative of a potential engine failure to ignite, which could lead to fuel pooling and creating a hazard due to excessive fuel flow without the expected engine response.

Engaging the stop start and engine clearing procedures is essential because it ensures safety by preventing an overrich condition that could result in engine damage or an uncontained engine failure. It also mitigates the risk associated with prolonged cranking, which could potentially overheat the starter motor and lead to additional complications.

In contrast, continuing to crank for the full 60 seconds or trying to monitor fuel flow while expecting a different outcome does not address the immediate issue of non-ignition and could lead to unsafe scenarios. Immediate action to safely clear the engine of excess fuel allows for a controlled approach in troubleshooting or attempting a subsequent start after corrective actions are taken.