What does the fuel system of a Part 23 airplane need to provide?

The fuel system of a Part 23 airplane is required to deliver fuel needed for each powerplant and any auxiliary power unit (APU) to function properly across a range of operating conditions. This includes ensuring that adequate fuel is available during takeoff, climb, cruise, descent, and landing phases of flight, which may present varying demands on the fuel system depending on the power settings and operational requirements.

This requirement ensures that the aircraft can maintain safe and efficient operations under different load conditions, from full-power scenarios during takeoff to reduced power during cruise. A well-designed fuel system must account for these varied operational environments, ensuring reliability and safety throughout the flight.

The other options suggest limitations or scenarios that do not comprehensively cover the operational demands placed on the aircraft's fuel system.