What precaution should be taken regarding fire safety during engine start-up?

Having fire extinguishers in the immediate area during engine start-up is crucial for safety because engine start-ups can potentially create hazardous conditions due to fuel vapors, high temperatures, and the risk of fire or explosion. Fire extinguishers provide immediate access to fire suppression equipment that can effectively contain or extinguish a fire before it escalates. This precautionary measure aligns with standard safety practices in aviation, where the risk of fire is heightened during engine operations.

While the other considerations—emergency egress plans, personnel proximity to the intake, and notifying ground crew—are all important components of operational safety, having fire extinguishers readily available directly addresses the immediate risk of fire during a phase of aircraft operation that is known for its potential hazards. Therefore, this choice emphasizes a proactive approach to fire safety.