The presence of pesticide residues on the aircraft belly may indicate what issue?

The presence of pesticide residues on the aircraft belly is a strong indicator of a leaking hose or connection. When there is a leak in the system, whether from hoses, fittings, or connections, pesticide can escape and accumulate on the exterior of the aircraft. This not only suggests that the application system is not functioning optimally but also raises concerns about safety and environmental contamination.

While excessive pressure in the tank, improper cleaning, and miscalibrated nozzles can all lead to issues with pesticide applications or residue management, they do not typically manifest as visible residues on the aircraft's belly. A leaking hose or connection is the most direct cause of such residues, necessitating immediate attention to ensure full containment and effectiveness of the application process.