What is the primary responsibility of the single flight attendant on the CRJ 550?

The primary responsibility of the single flight attendant on the CRJ 550 is to perform all duties. This encompasses a wide range of tasks that ensure the safety and comfort of passengers during the flight. These duties typically include safety demonstrations, attending to passenger needs, monitoring cabin conditions, managing boarding and deplaning processes, and responding to emergencies.

In a cabin with one flight attendant, it is essential that this individual is versatile and capable of handling multiple responsibilities efficiently. This can include serving food and beverages, addressing passenger inquiries, and ensuring compliance with safety regulations. As such, the role demands a multifaceted skill set, equipping the flight attendant to address various situations that may arise during a flight.

The other options illustrate specific tasks or focus areas rather than the general scope of the flight attendant's role. For instance, serving food is only one part of the flight attendant's duties and does not encompass the broader responsibilities that must be managed throughout the flight. Similarly, while assisting pilots and monitoring passenger behavior are important aspects, they fall under the broader mandate of performing all duties associated with cabin service and safety. Thus, recognizing the flight attendant's role as a comprehensive one aligns with the operational needs of the CRJ 550.