What is the recommended procedure if an induction fire occurs when starting a reciprocating engine?

In the event of an induction fire during the starting sequence of a reciprocating engine, the recommended procedure is to continue cranking the engine. This action helps to draw the flames and heat into the engine through the induction system, which often will extinguish the fire as the engine begins to draw in fuel-air mix. It's crucial to understand that an induction fire is typically localized within the air intake, and continuing to crank the engine can help mitigate the fire's impact.

Waiting for the fire to extinguish naturally is not advisable since it may lead to more extensive damage and hazardous situations. Turning off all systems and abandoning the aircraft does not help extinguish the fire and puts the pilot and crew at risk without addressing the immediate situation. Utilizing a fire extinguisher could be beneficial, but if the engine is cranked, it may eliminate the fire before it requires external intervention. Thus, cranking the engine is the most effective immediate response in this emergency situation.