What is the minimum number of aircraft rescue and firefighting vehicles required at San Francisco Intl (SFO) under FAR Part 139?

The correct answer is that three aircraft rescue and firefighting vehicles are required at San Francisco International Airport (SFO) under FAR Part 139 regulations. This regulation stipulates minimum standards for airport operations, including the provision of firefighting and rescue services to ensure safety during aircraft emergencies.

The number of vehicles required is determined based on several factors, including the number of passenger seats in the aircraft that the airport accommodates and the level of operations. Since SFO is a large airport that handles a significant volume of commercial operations and larger aircraft, it necessitates a higher level of firefighting capability to effectively respond to potential emergencies.

Airports with a higher volume of operations and larger aircraft typically require more rescue and firefighting vehicles to ensure rapid response times and adequate coverage. Therefore, having three vehicles at SFO meets the regulatory requirements for ensuring public safety and improving response efficiency during emergencies.