Which components are fed by the left P3 port?

The left P3 port supplies air to the On-Board Oxygen Generating System (OBOGS). This system plays a critical role in providing breathable oxygen to pilots and crew members at high altitudes or in environments where breathable air is insufficient. The P3 port is an essential part of the aircraft's pneumatic system, ensuring that oxygen is generated effectively during flight operations.

The other components mentioned—canopy seal, heating, and pressurization—are not directly fed by the left P3 port. The canopy seal involves maintaining a secure seal around the cockpit to regulate pressure and prevent leaks, but this does not utilize the P3 air directly. Similarly, while heating may require pneumatic air, it typically draws from different sources or systems. Pressurization, which ensures that the cockpit and cabin maintain a safe and comfortable environment, also operates through separate pneumatic systems that may not directly link to the OBOGS or the left P3 port. Thus, the most accurate answer regarding the components supplied by the left P3 port is OBOGS.