When might a pilot issue a PIREP?

A pilot issues a PIREP, or Pilot Report, primarily to report actual weather conditions encountered during flight. This information is crucial for other pilots and air traffic control as it helps them make informed decisions about weather-related issues such as turbulence, icing, cloud cover, visibility, and changes in wind conditions.

The PIREP can provide real-time data that might not be captured by weather stations or other reporting systems, allowing those who receive the report to adjust flight plans, approach paths, or altitudes accordingly. This emphasizes the importance of pilots sharing their experiences and observations while in the air, thereby contributing to overall flight safety and operational efficiency.

While reports on scheduled flight times, air traffic instructions, and maintenance matters might seem relevant in the context of aviation operations, they do not pertain to the specific purpose of a PIREP, which is focused solely on reporting flight conditions.