Squawk 7700 transmission — UAL1166

UAL1166 (United Airlines) was operating from KSFO to KIAH on 2026-03-15. SkyMeter recorded a 7700 transponder transmission at 22:53 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: 14410 ft AGL, 427 kt GS. Approach stability score: 82/100. Scores in this band are observed on roughly 25% of approaches at this runway: one or more gates outside the per-runway tightest envelope, but still inside the typical operating range. METAR at the time reported 9 kt wind, 1 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.

• SECURITY5/6914 2025-05-06 23:30Z – 2027-10-18 11:03Z SFC–6,000 ft

  South Padre Island, TX, Tuesday, May 6, 2025 Local

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• SECURITY5/0601 2025-11-30 19:00Z – 2026-05-31 18:59Z SFC–400 ft

  Los Angeles, CA, Sunday, November 30, 2025 through Sunday, May 31, 2026 Local

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• SECURITY5/3678 2026-01-01 05:00Z – 2027-01-01 05:59Z SFC–2,000 ft

  Brownsville, TX, Thursday, January 1, 2026 through Friday, January 1, 2027 Local

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• SECURITY5/3679 2026-01-01 05:00Z – 2027-01-01 05:59Z SFC–5,000 ft

  Brownsville, TX, Thursday, January 1, 2026 through Friday, January 1, 2027 Local

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• SECURITY6/0091 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

  Coyote Wells, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

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• SECURITY6/0092 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

  CALEXICO, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

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• SECURITY6/4165 2026-02-14 07:00Z – 2026-08-15 06:59Z SFC–400 ft

  Nogales, AZ, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• SECURITY6/4160 2026-02-14 08:00Z – 2026-08-15 06:59Z SFC–400 ft

  Chula Vista, CA, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• SECURITY6/4240 2026-03-08 08:00Z – 2026-11-01 07:00Z SFC–180 ft

  SAN ANGELO, TX, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local

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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.

All events on this flight

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