Which of the following information is NOT a part of the PIREP format?

The PIREP format, or Pilot Report format, is designed to provide vital information about weather conditions as experienced by pilots during flight. It includes specific data points that are essential for other pilots and air traffic control to understand the current weather conditions in a given area.

Location is included in the PIREP format because it provides the geographical context of where the observed conditions are occurring. Sky cover is also a critical element, as it informs others about cloud conditions that could affect visibility and flight safety. Flight visibility is crucial information that directly impacts a pilot's ability to navigate safely and must be reported in PIREPs.

On the other hand, precipitation type, while relevant to weather conditions, is not a required element in the standard PIREP format. PIREPs focus on the immediate conditions that affect flying, such as turbulence, wind direction, and significant weather, rather than detailing every possible weather phenomenon like specific types of precipitation. Therefore, it is not part of the key components that need to be reported in a PIREP.