Squawk 7700 transmission — UAL1855

UAL1855 (United Airlines) had departed KLAX on 2026-09-03. SkyMeter recorded a 7700 transponder transmission at 20:32 UTC. Code 7700 indicates a general emergency declaration (e.g. engine, medical, smoke). A sustained transmission is normally accompanied by ATC priority handling. Trace data at the event: 22696 ft AGL, 362 kt GS. METAR at the time reported 9 kt wind, 7 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.

• HAZARDS6/0685 2026-09-03 03:30Z – 2026-09-17 03:00Z SFC–3,500 ft

  7NM SE MISSION VIEJO, CA, Thursday, September 3, 2026 through Thursday, September 17, 2026 UTC

  View FAA NOTAM →
• HAZARDS6/0784 2026-09-03 14:30Z – 2026-09-17 03:00Z SFC–3,500 ft

  7NM SE MISSION VIEJO, CA, Thursday, September 3, 2026 through Thursday, September 17, 2026 UTC

  View FAA NOTAM →

SkyMeter cross-referenced this flight against FAA-published TFRs that were active during its window and within its geographic bounding box. Overlap doesn't necessarily mean violation — the aircraft may have been outside the TFR’s precise polygon or flying under air-traffic-control coordination.

Automated analysis. Events shown on this page (such as go-around, unstable approach, or runway events) are heuristic classifications produced by algorithms from publicly broadcast ADS-B data. They are intended to surface flights of interest for further review — they are not findings of fact, and they do not determine pilot fault, regulatory compliance, or the cause of any occurrence. Coverage gaps and sensor noise can affect accuracy. Only the relevant civil aviation authority or accident investigation body can make official determinations. How we detect events · Dispute or correct this data