What cockpit pressure differential does the system aim for at 18,069 feet?

The correct answer is based on the design specifications of the T-6B aircraft's pressurization system. At an altitude of 18,069 feet, the cockpit pressure differential is optimized to be 3.6 ± 0.2 psi. This pressure differential is crucial for maintaining a safe and comfortable environment for the pilot and crew while allowing the aircraft to operate efficiently at high altitudes.

In pressurized aircraft systems, maintaining a specific cabin pressure differential is vital because it ensures adequate oxygen levels and helps alleviate issues associated with altitude, such as hypoxia. The specified pressure differential correlates with engineering standards for the aircraft's altitude capabilities, ensuring that it remains both functional and within safe operating limits.

Other choices present different pressure differentials that do not align with the specified functioning range of the cockpit pressurization at that altitude, making 3.6 ± 0.2 psi the correct target for the cockpit pressure differential in these circumstances.