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| Date: | Wednesday 31 May 2023 |
| Time: | 20:21 UTC |
| Type: |  Boeing 777-31HER |
| Owner/operator: | Emirates |
| Registration: | A6-EGI |
| MSN: | 38986/974 |
| Year of manufacture: | 2011 |
| Engine model: | General Electric GE90-115B |
| Fatalities: | Fatalities: 0 / Occupants: |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | Colombo FIR -
 Indian Ocean
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Jakarta-Soekarno-Hatta International Airport (CGK/WIII) |
| Dubai Airport (DXB/OMDB) | |
| Investigating agency: | CAASL |
| Confidence Rating: |  Accident investigation report completed and information captured |
Emirates flight UAE5CL (Airbus A380, A6-EVG) en-route to Dubai, UAE from Sydney, Australia on the air route L896, maintaining FL360, entered Colombo Flight Information Region (FIR) via the reporting point NISOK at time 2000 UTC. Emirates flight UAE359 (Boeing 777-300ER, A6-EGI), which was en-route to Dubai, UAE from Jakarta, Indonesia following the same air route L896, maintaining FL340 also entered Colombo Flight Information via the reporting point NISOK at time 2003 UTC. At time 2021 UTC, when both the aircraft were flying relative to each other maintaining minimum standard vertical separation of 2000ft, UAE359 had requested to climb to higher Level FL360, to the same flight level that UAE5CL, the preceding aircraft was maintaining. ATCO had granted the flight level requested by UAE359 and the aircraft acknowledged and climbed to FL360. This caused a deviation in the minimum vertical separation standard to exist between the two aircraft. Approximately 11 minutes later with the ADS update the controller had noticed that both aircraft were maintaining the same flight level without the adequate longitudinal separation, which should have been 50 nautical miles. The controller on realising this, had descended UAE359 to FL340 once more to establish vertical separation.
Cause: Momentary loss of concentration and the consequent loss of situational awareness by the controller.
Accident investigation:
 |
|
Sources:
CAASL
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Jun-2025 07:22 | Prometheus | Added |
| 22-Jun-2025 07:23 | ASN | Updated [Accident report, ] |
| 15-Sep-2025 16:49 | ASN | Updated [Narrative, ] |
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