Casualties unknown

1997-04-17: Boeing 737-500 (N930UA) — Rialto, CA

Rialto, CA, US

On April 17, 1997, a Boeing 737-500 (registration N930UA) was involved in an aviation accident near Rialto, CA. Investigators recorded the probable cause as: a laser light source of undetermined origin, directed by unknown person(s) toward the cockpit window of the aircraft, while the aircraft was on an approach to land. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards
Aircraft registered N930UA
Aircraft registered N930UA. Photo: Ken Fielding / CC BY-SA 3.0, via Wikimedia Commons

During a standard instrument arrival, a flight crew encountered a bright green light that caused a temporary night vision impairment. The source of the light remains unidentified.

Incident Overview

A flight crew on a standard instrument arrival reported a brief but notable visual disturbance caused by a bright green light. The captain, who was handling the controls, first noticed the light as it appeared to be tracking the aircraft. He pointed this out to the first officer, at which point the light vanished. The captain stated that the light caused a minimal but persistent reduction in his night vision, but he was able to maintain full control of the aircraft for the remainder of the flight.

Pilot Report and ATC Communication

Following the incident, the captain informed air traffic control that the light seemed to originate from the western edge of the city. No other details about the light's characteristics or behavior were provided.

Medical Examination

After landing, the captain underwent a medical examination by Air Force specialists. The examination found no permanent evidence of eye damage. The pilot's night vision subsequently returned to normal.

Investigation

Investigators from the relevant authorities attempted to locate the source of the green light. Their efforts were unsuccessful, and the origin of the light remains unknown. Additionally, there were no Notices to Air Missions (NOTAMs) in effect at the time of the incident that mentioned any laser light activity or similar hazards.

Conclusion

The incident highlights an unexplained visual phenomenon encountered during flight. The temporary night vision impairment did not affect the safe outcome of the flight, and no further issues were reported.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001208X07739. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.