Vistara A20N near Pune on Feb 7th 2018, descended below cleared level causing near collision

Last Update: February 15, 2018 / 16:18:45 GMT/Zulu time

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Incident Facts

Date of incident
Feb 7, 2018

Classification
Incident

Flight number
UK-997

Departure
Delhi, India

Destination
Pune, India

Aircraft Registration
VT-TNE

Aircraft Type
Airbus A320-200N

ICAO Type Designator
A20N

A Vistara Airbus A320-200N, registration VT-TNE performing flight UK-997 from Delhi to Pune (India) with 152 people on board, was in the initial descent towards Pune but continued to descend below cleared level.

An Air India Airbus A319-100, registration VT-SCV performing flight AI-631 from Mumbai to Bhopal (India) with 109 people on board, was climbing out of Mumbai. Both aircraft received TCAS resolution advisories, the aircraft crossed each other (the A319 climbed through the level of the A20N, the A20N descended through the level of the A319 during the TCAS resolution). After being clear of conflict both aircraft continued to their destinations for safe landings.

India's DGCA have opened an investigation into the occurrence rated a serious incident. The DGCA reported Air India complied with the ATC instructions, however, the Vistara crew descended their aircraft below cleared level and continued to descend although ATC was issuing different instructions.

On Feb 15th 2018 India's DGCA reported the separation between the two aircraft reduced to 0 feet vertically and less than 2nm laterally. ATC had cleared UK-997 to descend to FL290 while AI-631 had been cleared to climb to FL270. UK-997 continued to descend below FL270, TCAS resolution advisories were triggered in both flight decks, UK-997 crossed through te level of AI-631. The occurrence was rated a serious incident and is being investigated.
Incident Facts

Date of incident
Feb 7, 2018

Classification
Incident

Flight number
UK-997

Departure
Delhi, India

Destination
Pune, India

Aircraft Registration
VT-TNE

Aircraft Type
Airbus A320-200N

ICAO Type Designator
A20N

This article is published under license from Avherald.com. © of text by Avherald.com.
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