How should investigators handle limited accessibility to a crash site?

• A. Rely solely on eyewitness testimony
• B. Abandon data collection and write the report
• C. Use alternative data sources, remote sensing, and documentation methods while preserving evidence.
• D. Delay investigation until access is restored

Answer: (C)

When access to a crash site is limited, the focus is on keeping the investigation moving by gathering data that doesn’t require being on scene and by preserving any evidence that is accessible. Rely on alternative data sources such as flight data records, cockpit voice recordings, radar/ADS-B data, air traffic control transcripts, weather information, and maintenance logs. These pieces help establish the sequence of events, performance parameters, and potential system or human factors without needing to be physically at the site.

Complement that with remote sensing and careful documentation. Satellite imagery or aerial photos, drone imagery from safe distances, and photogrammetric techniques can recreate the scene, map the debris field, and support reconstruction efforts. Any remotely collected data should be documented with clear metadata, time stamps, and provenance to maintain credibility.

Preserving evidence remains essential. Securely document the current state of the scene, prevent unnecessary disturbance, and maintain a clear chain-of-custody for all collected data, including remotely obtained information. This approach allows investigators to develop a coherent timeline, identify potential failure modes, and continue the investigation responsibly while access constraints are resolved.

Relying solely on eyewitness accounts can be unreliable, and abandoning data collection or waiting indefinitely for access would stall safety improvements and learning from the incident.