Narrative:

While turning base leg for a visual approach to runway 24R at lax; I spotted a red or orange object pass closely over the top of my (captain) windscreen. I saw the object for less than one second; and immediately thought it was a model uav (4-legged cross looking). I reported this to socal approach so they could pass advisories to proximate aircraft. It all happened so quickly that I can't be completely sure the object was a uav; versus paper; balloons; etc. However; I do remember the object being square shaped with defined lines; versus irregular like paper or balloons. The object was definitely red or orange in color. I failed to report this sooner; because it happened so quickly; and we were involved in our approach; so after it happened; it completely slipped my mind. This object was so small it could not be seen in time for evasion. If it was a uav; it shouldn't be flown that high near a major airport.

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Original NASA ASRS Text

Title: B737-700 Captain reports sighting a small UAV at 4;000 feet during a visual approach to Runway 24R at LAX.

Narrative: While turning base leg for a Visual Approach to Runway 24R at LAX; I spotted a red or orange object pass closely over the top of my (Captain) windscreen. I saw the object for less than one second; and immediately thought it was a model UAV (4-legged cross looking). I reported this to SoCal Approach so they could pass advisories to proximate aircraft. It all happened so quickly that I can't be completely sure the object was a UAV; versus paper; balloons; etc. However; I do remember the object being square shaped with defined lines; versus irregular like paper or balloons. The object was definitely red or orange in color. I failed to report this sooner; because it happened so quickly; and we were involved in our approach; so after it happened; it completely slipped my mind. This object was so small it could not be seen in time for evasion. If it was a UAV; it shouldn't be flown that high near a major airport.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.