What is commonly required for operation above 14,000 feet in a Cessna 172?

For operation above 14,000 feet in a Cessna 172, supplemental oxygen is commonly required due to physiological considerations. As altitude increases, the availability of oxygen decreases, which can lead to hypoxia, a condition that occurs when the body does not receive enough oxygen. The Federal Aviation Administration (FAA) regulations stipulate that pilots must use supplemental oxygen when operating above 14,000 feet, as the air at these altitudes can become insufficient to support cognitive function and overall health without it.

Supplemental oxygen helps maintain adequate oxygen levels in the bloodstream, ensuring that pilots can operate the aircraft safely. This requirement is vital for any flight operation where altitude may affect a pilot's performance and consciousness.

Other options, such as extended pre-flight checks, flight plan filing, and additional fuel reserves, while important considerations in general aviation, do not specifically pertain to the physiological requirements associated with operating at higher altitudes in this aircraft.