Squawk 7700 transmission — ACA853
2026-05-02 08:16 UTC· EGLL → EGLL· Air Canada· B77W
ACA853 (Air Canada) was operating from EGLL to EGLL on 2026-05-02. SkyMeter recorded a 7700 transponder transmission at 08:16 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: 33949 ft AGL, 471 kt GS. METAR at the time reported 8 kt wind. Detection algorithm and known limitations: see SkyMeter methodology.
Pilot review data
- 33949 ft AGL at event
- 471 kt ground speed
- 0 fpm vertical
- 8 kt wind
- 0 kt crosswind component
Flight context
- ACA853
- Air Canada
- B77W
- EGLL → EGLL
- 2026-05-02 08:16 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