Pilots should report which of the following conditions in a PIREP?

In a PIREP, or Pilot Report, it is essential for pilots to communicate information that directly affects flight safety and operational effectiveness. One of the key purposes of PIREPs is to provide real-time observations of weather conditions encountered during flight, especially unexpected weather phenomena that might not be adequately covered by weather forecasts or radar information.

Reporting unexpected weather phenomena, such as severe turbulence, thunderstorms, icing conditions, or volcanic ash, is vital. This information can help other pilots and air traffic control make informed decisions regarding flight paths and safety. By sharing these observations, pilots contribute to the collective knowledge that enhances safety for all aircraft in the vicinity.

Other conditions mentioned, such as in-flight entertainment system issues, flight delays due to passenger boarding, and ground operations problems, are less critical to be included in a PIREP. These issues do not pose immediate safety threats or affect the operational performance of flights in the same way that weather conditions do. Therefore, while they may be relevant in different contexts, they are not the focus of PIREPs, which prioritize significant safety-related observations such as unexpected weather phenomena.