Which factors would NOT trigger a PIREP solicitation?

Visual flight rules (VFR) operations typically do not trigger a PIREP (Pilot Report) solicitation because VFR conditions indicate generally good weather, allowing pilots to fly by visual reference rather than relying solely on instruments. When conditions are favorable for visual navigation, the priority for collecting PIREPs shifts, as the need for detailed reports about weather phenomena diminishes.

In contrast, the other options—ceilings at or below 5,000 feet, the presence of thunderstorms, and light or greater icing—represent conditions that could significantly affect flight safety, thus prompting air traffic control or meteorological services to seek more information via PIREPs. These reports are vital for maintaining situational awareness and ensuring safe navigation through potentially hazardous weather.