What is indicated when the gear handle light is illuminated?

When the gear handle light is illuminated, it indicates that the main gear inboard doors are not fully closed. This warning serves as an important safety feature, informing the pilot that the landing gear system may not be in a secure configuration, which could affect the aircraft's ability to land safely. The illumination typically signifies that there is a potential for a malfunction or improper position of the landing gear components, prompting the pilot to take corrective measures or conduct checks to confirm the status of the landing gear. This is a crucial aspect of pre-landing checks, as ensuring that all components are fully deployed and secured can prevent issues during landing operations.