GB/T 38924.11-2023 is Part 11 of the series of standards for environmental testing of civil light and small unmanned aircraft systems, which specifies the mold test requirements for such systems (including aircraft and ground stations). It applies to evaluating their ability to resist mold effects during transportation, storage, and use. The standard defines key aspects such as test conditions, procedures, and result evaluation. By providing an environment suitable for mold growth, it allows observation of mold development on equipment surfaces and changes in functional performance. The test requires the use of instruments such as mold incubators, sterilization equipment, and spore suspension preparation devices to precisely control parameters like temperature and humidity. This provides a unified technical basis for mold-proof design, material selection, and quality control of unmanned aircraft systems.