ASN Wikibase Occurrence # 202328
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| Date: | Monday 25 July 2016 |
| Time: | 20:36 |
| Type: |  Airbus A320-232 |
| Owner/operator: | Vueling |
| Registration: | EC-LRE |
| MSN: | 1914 |
| Year of manufacture: | 2002 |
| Engine model: | IAE V2527-A5 |
| Fatalities: | Fatalities: 0 / Occupants: 157 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | Barcelona TMA -
 Spain
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Barcelona-El Prat Airport (BCN/LEBL) |
| Napoli-Capodichino Airport (NAP/LIRN) | |
| Investigating agency: | CIAIAC |
| Confidence Rating: |  Accident investigation report completed and information captured |
An Airbus A321 registration HB-ION, operated by Swiss, with callsign SWR191Q, had taken off from the Barcelona Airport, Spain, en route to the Zurich Airport, Switzerland. At the same time, an Airbus A320 registration EC-LRE, operated by Vueling, with callsign VLG6502, was flying from Barcelona to the Naples Capodichino Airport in Italy.
The former was flying on standard instrument departure DALIN3Q, while the latter was following standard instrument departure VERSO3Q. These two routes have a segment in common until point NITBA, from which the aircraft proceed to the final fix of the standard departure maneuver.
The aircraft operated by Swiss was ahead of the Vueling aircraft in the departure sequence. To avoid conflicting with arriving aircraft, air traffic control instructed the crews of both aircraft to turn left and fly direct to the final fix of their standard departure maneuvers (DALIN and VERSO) once they reached flight level FL080.
The different climb rates of the aircraft caused the separation between them to diminish until it reached a minimum value of 1.2 NM horizontally and 200 ft vertically, which triggered a TCAS traffic advisory (TA) and then a resolution advisory (RA).
The execution of the evasive maneuvers created a separation of the aircraft that allowed both aircraft to resume normal navigation.
The airborne collision avoidance system (ACAS) did not respond as expected based on its theoretical parameters. Analyzing this type of event using simulation tools requires an analysis of the BDS10 and BDS30 data protocols used by the S-mode radar.
Accident investigation:
 |
|
Sources:
http://www.fomento.gob.es/NR/rdonlyres/50B4E4E1-17BC-4723-A18A-AD48CC2EC1C0/146367/2016_029_IN_ENG.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Nov-2017 20:08 | harro | Added |
| 29-Nov-2017 20:15 | harro | Updated [Narrative] |
Corrections or additions? ... Edit this accident description
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