If the airborne weather radar becomes inoperative en route, what should the pilot do?

When airborne weather radar becomes inoperative during a flight, the pilot's primary resource in navigating through weather conditions becomes the flight operations manual. This manual contains specific procedures and guidelines for various scenarios, including equipment failure.

By following the protocols outlined in the flight operations manual, pilots can ensure they are making informed decisions based on the aircraft's operational parameters, the current flight conditions, and the safety of those on board. The manual may include procedures for how to assess weather conditions using alternative resources like air traffic control assistance, flight data, or other onboard instruments.

This choice maintains adherence to established safety standards and operational protocols, which is vital for safely managing in-flight situations where equipment malfunction could complicate navigation or increase risks associated with adverse weather conditions.

The other options present specific actions that might not be in alignment with the procedures outlined in the flight operations manual, making option B the most responsible and safety-oriented choice.