Which procedural document is known as the Applicable FIT-D?

The Applicable FIT-D refers specifically to the procedures that deal with fire protection systems, which are integral to maintaining safety and operational readiness in aviation. The Dry Bay Fire Protection System Procedures are designed to outline how to use and maintain fire suppression systems effectively in the aircraft’s dry bays—areas where flammable fluids may be stored, and where fire hazards are most critical. Understanding and adhering to these procedures is vital for ensuring the safety of both the aircraft and its crew in the event of a fire.

Other procedural documents may cover important operational or maintenance aspects, but they do not specifically focus on the targeted fire protection systems in the same way that the Dry Bay Fire Protection System Procedures do. Hence, option B is recognized as the correct answer in the context of procedural documents related solely to fire safety measures within aviation operations.