Squawk 7700 transmission — UAL817
2026-08-21 02:07 UTC· KSFO → KLAX· UNITED AIRLINES INC· A320
UAL817 (United Airlines) was operating from KSFO to KLAX on 2026-08-21. SkyMeter recorded a 7700 transponder transmission at 02:07 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: 34261 ft AGL, 499 kt GS. METAR at the time reported 5 kt wind, 2 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.
Active FAA TFR during this flight
Source: FAA TFR archive (hourly snapshot)- SECURITY6/2652 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft
Coyote Wells, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local
View FAA NOTAM → - SECURITY6/2656 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft
Coyote Wells, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local
View FAA NOTAM → - SECURITY6/2657 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft
Calexico, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local
View FAA NOTAM → - SECURITY6/4812 2026-07-15 07:00Z – 2027-07-14 06:59Z SFC–17,999 ft
El Centro, CA, Wednesday, July 15, 2026 through Tuesday, July 13, 2027 Local
View FAA NOTAM → - HAZARDS6/7246 2026-07-21 05:00Z – 2026-08-21 03:00Z SFC–10,500 ft
20NM N INDEPENDENCE, CA, Tuesday, July 21, 2026 through Friday, August 21, 2026 UTC
View FAA NOTAM → - HAZARDS6/7372 2026-07-21 13:38Z – 2026-08-22 03:00Z SFC–10,500 ft
20NM N INDEPENDENCE, CA, Tuesday, July 21, 2026 through Saturday, August 22, 2026 UTC
View FAA NOTAM → - HAZARDS6/3138 2026-08-09 17:20Z – 2026-08-22 15:00Z SFC–15,000 ft
15NM SE BIG PINE, CA, Sunday, August 9, 2026 through Saturday, August 22, 2026 UTC
View FAA NOTAM → - HAZARDS6/3157 2026-08-10 01:18Z – 2026-08-23 15:00Z SFC–7,500 ft
8NM SE BIG SUR, CA, Monday, August 10, 2026 through Sunday, August 23, 2026 UTC
View FAA NOTAM → - HAZARDS6/3480 2026-08-10 18:36Z – 2026-08-23 15:00Z SFC–7,500 ft
8NM SE BIG SUR, CA, Monday, August 10, 2026 through Sunday, August 23, 2026 UTC
View FAA NOTAM → - HAZARDS6/3712 2026-08-11 14:00Z – 2026-08-25 04:00Z SFC–8,000 ft
18NM SW PRESCOTT, AZ, Tuesday, August 11, 2026 through Tuesday, August 25, 2026 UTC
View FAA NOTAM → - HAZARDS6/5070 2026-08-14 13:00Z – 2026-08-27 03:00Z SFC–8,500 ft
8NM SE BIG SUR, CA, Friday, August 14, 2026 through Thursday, August 27, 2026 UTC
View FAA NOTAM → - HAZARDS6/5474 2026-08-17 07:41Z – 2026-08-22 00:15Z SFC–5,000 ft
IMPERIAL, CA, Monday, August 17, 2026 through Saturday, August 22, 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.
Pilot review data
- 34261 ft AGL at event
- 499 kt ground speed
- 0 fpm vertical
- 5 kt wind
- 2 kt crosswind component
Flight context
- UAL817
- United Airlines
- A320
- KSFO → KLAX
- 2026-08-21 02:07 UTC
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