ASN Wikibase Occurrence # 318261
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| Date: | Sunday 16 April 2017 |
| Time: | 08:06 UTC |
| Type: |  Airbus A320-216 |
| Owner/operator: | AirAsia India |
| Registration: | VT-JRT |
| MSN: | 3448 |
| Year of manufacture: | 2008 |
| Fatalities: | Fatalities: 0 / Occupants: 170 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near waypoint BODOG -
 India
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Bagdogra Airport (IXB/VEBD) |
| Delhi-Indira Gandhi International Airport (DEL/VIDP) | |
| Investigating agency: | AAIB India |
| Confidence Rating: |  Accident investigation report completed and information captured |
AirAsia India flight IAD768, an Airbus A320-216 (VT-JRT), and IndiGo flight IGO398, an Airbus A320-232 (VT-AIV), were involved in a serious airprox incident.
IAD768, flying west bound from Bagdogra to Delhi, was given descent instructions from FL360 to FL340 by the Varanasi Radar Controller and the same was correctly read back by the crew. IAD768 continued descent to FL320 without authorization from Varanasi ATC and became a potential conflict to the reciprocal east bound Indigo flight IGO398 from Delhi to Bagdogra at a level cruise at FL330. IGO398
reported getting traffic advisory and was observed to be turning right to avoid the essential traffic whereas the Radar Controller advised IGO398 to turn left heading 020. The crew of IAD768 and Radar Controller were involved in an argument over R/T. Thereafter the flights were uneventful. The lateral and vertical separation was reduced to 5 NM and Zero feet respectively.
Probable Cause:
1. Unauthorized descend by Crew of IAD 768 beyond Flight Level cleared by ATC.
Contributory Factors:
1. Expectation bias for FL320 by Crew of IAD768.
2. Attention deficit due to handing over communication to P2 by P1 for writing in Tech Log.
3. Failure of the Radar Controller to maintain proper surveillance over the aircrafts and poor traffic conflict resolving.
4. Failure of the Radar Controller and Crew of IAD768 to maintain RT discipline as both was having arguments over RT.
Accident investigation:
 |
|
Sources:
AAIB India
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Jul-2023 06:07 | harro | Added |
| 22-Jul-2023 06:20 | harro | Updated |
Corrections or additions? ... Edit this accident description
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