ASN Wikibase Occurrence # 310226
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| Date: | Saturday 29 February 2020 |
| Time: | 12:59 UTC |
| Type: |  Airbus A320-214 |
| Owner/operator: | AirAsia India |
| Registration: | VT-CCU |
| MSN: | 4641 |
| Year of manufacture: | 2011 |
| Engine model: | CFMI CFM56-5B4/P |
| Fatalities: | Fatalities: 0 / Occupants: |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Delhi -
 India
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Goa International Dabolim Airport (GOI/VOGO) |
| Delhi-Indira Gandhi International Airport (DEL/VIDP) | |
| Investigating agency: | AAIB India |
| Confidence Rating: |  Accident investigation report completed and information captured |
AirAsia India flight I5776, an Airbus A320-214 (VT-CCU), and IndiGo flight IGO2124, an Airbus A320-232 (VT-IAR), were involved in a serious airprox incident.
IGO2124, departed from Delhi Airport for Chennai at 12:47 UTC. It came in contact with Delhi Approach Radar while it was climbing to FL90. The Radar Controller gave further instructions to climb to FL100.
Flight 776 was arriving to Delhi from Goa. It was in contact with Delhi Approach Radar Controller. This controller gave descent instructions to FL110 from FL120. This instruction was acknowledged
correctly by flight crew.
Due to bad weather, aircraft were diverting from their assigned tracks. Due to which I5776 and IGO2124 came on a reciprocal track. IGO2124 was maintaining FL100 and I5776 was descending to FL110.
After some time, it was observed by the controller that I5776 had descended below the assigned level i.e. FL110. Due to which the STCA (Predicted) was generated which soon turned to STCA (Violation) by the Automation System.
The minimum separation reduced to 0.5 NM laterally and 600 feet vertically. Separation was restored in 26 seconds.
Probable Cause of the Incident.
i. Unauthorized descend by IAD776, below FL110 in violation to ATC instruction.
Contributory Factor.
i. Increase in workload in cockpit due to bad weather.
ii. Inadequate monitoring of traffic in close proximity.
Accident investigation:
 |
|
Sources:
AAIB India
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Apr-2023 19:47 | harro | Added |
Corrections or additions? ... Edit this accident description
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