What is the purpose of considering weather in an aviation mishap investigation, and which data sources are commonly used?

• A. Weather data is optional and rarely used in investigations.
• B. Weather conditions may influence risk; sources include METAR/TAF, radar, satellite imagery, lightning data, and on-site weather observations.
• C. Weather is considered only for pilot decision-making; sources include flight plans and air traffic control logs.
• D. Only post-crash weather data from the last hour is useful; sources include satellite imagery only.

Answer: (B)

Understanding weather's influence on flight operations helps investigators determine how atmospheric conditions may have contributed to an incident, and weather data provide the timeline and context needed to reconstruct what happened. Weather can affect visibility, aircraft performance, and crew decision-making, and it can create hazards such as icing, turbulence, wind shear, and microbursts that alter a flight path or outcome.

In investigations, gathering weather information is essential and routinely done. Common data sources include METARs and TAFs for observed and forecast conditions at specific times and airports; radar data showing real-time precipitation and storm structure; satellite imagery for broader cloud cover and weather systems; lightning data indicating storm activity; and on-site weather observations from the crash site or nearby stations to capture local conditions at the time of the incident. Together, these sources help establish the weather environment, determine if adverse conditions were present and influential, and assess their potential impact on flight operations and decision-making.

Options that treat weather as optional or limited to pilot decision-making miss its broader role in shaping risk and outcomes, and relying on a single data stream, like satellite imagery or post-crash observations from only the last hour, would not provide a complete or accurate picture of the conditions at the time of the mishap.