What requirement must be met regarding cargo in the passenger compartment of an air carrier airplane?

The requirement that cargo in the passenger compartment of an air carrier airplane must not restrict access to any aisle in the passenger compartment is crucial for safety and emergency procedures. This regulation ensures that passengers and crew can move throughout the cabin without obstruction, particularly in emergency situations where quick evacuation may be necessary. Keeping aisles clear allows for better access to emergency exits and ensures that flight attendants can effectively assist passengers.

Ensuring that cargo does not impede movement within the cabin is a fundamental aspect of cabin safety regulations. This rule is designed to minimize hazards that could arise from improperly secured or placed cargo that might shift during flight or in turbulence, thereby creating additional risks for passengers and crew. It reinforces the importance of maintaining a safe environment throughout the cabin during all phases of flight.