Accident Boeing 737-8AL (WL) VT-TGE, Monday 7 June 2021
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Date:Monday 7 June 2021
Time:c. 10:40 UTC
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different    
Boeing 737-8AL (WL)
Owner/operator:Vistara
Registration: VT-TGE
MSN: 39061/4579
Year of manufacture:2013
Fatalities:Fatalities: 0 / Occupants: 120
Other fatalities:0
Aircraft damage: None
Category:Accident
Location:W of Kolkata -   India
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Mumbai-Chhatrapati Shivaji International Airport (BOM/VABB)
Destination airport:Kolkata-Netaji Subhas Chandra Bose International Airport (CCU/VECC)
Investigating agency: AAIB India
Confidence Rating: Accident investigation report completed and information captured
Narrative:
Vistara flight UK775, a Boeing 737-800, encountered turbulence 15 minutes before landing at Kolkata, India. Two passengers onboard received serious injuries and 2 passengers received minor injuries.

The aircraft took off from Mumbai and the flight was uneventful throughout climb and cruise phase. Kolkata ATIS issued weather warning of TSRA and gusty winds at the time of arrival of the aircraft at Kolkata. The PF made a PA informing passenger about the expected turbulent weather during descent and advised to keep the seat belt fastened. PF also informed the SCC to secure the cabin.
The aircraft was on the right of the assigned track as there were CB’s & Line squalls along the route and also to the left hand side of the route. Further to this deviation, there were similar line squalls and thunderstorms. As per the flight crew, during descent at FL390, they identified a 20 NM gap between two CB’s and decided to fly through it. While passing through the gap aircraft started experiencing light to moderate turbulence. This moderate turbulence lasted for 10-15 seconds and ended with a huge bump of severe turbulence, which lasted for 1-2 seconds.

Probable Cause of the Accident
The accident occurred as the aircraft entered into a severe turbulence instead of circumnavigating it. This resulted in serious injuries to passengers who presumably did not comply with” fasten seat belt” sign and instructions given by cabin crew.
Contributory factors to the accident were: -
➢ The flight crew was well aware about the deteriorating weather at and around Kolkata. Notwithstanding this, they continued the flight in severe weather conditions.
➢ Operator’s Operations Manual does not provide clear cut guidance to flight crew regarding circumnavigation through the enroute bad weather (weather avoidance).
➢ At any point during the flight, the flight crew did not consider diverting to an alternate airfield even though they were not sure whether the gap is clear of any clouds.
➢ Flight Dispatch did not provide any guidance to flight crew, while they were negotiating enroute weather which was not in line with the company Flight Dispatch Manual.
➢ As the aircraft was approaching the identified gap, PIC instructed cabin crew to be seated due to which the process of seatbelt compliance and securing the cabin could not be completed.

Accident investigation:
cover
  
Investigating agency: AAIB India
Report number: 
Status: Investigation completed
Duration: 8 months
Download report: Final report

Sources:

https://indianexpress.com/article/india/vistara-mumbai-kolkata-flight-passengers-7348273/
https://www.flightradar24.com/data/aircraft/vt-tge#27f72d6e
Video : http://www.goklerdeyiz.net/yolcu-ucagi-turbulansa-yakalandi-8-yolcu-yaralandi/

Location

Revision history:

Date/timeContributorUpdates
07-Jun-2021 19:57 Goklerdeyiz.net Added
07-Jun-2021 19:59 harro Updated [Time, Aircraft type, Total fatalities, Total occupants, Other fatalities, Location, Source, Narrative]
07-Apr-2022 09:21 harro Updated [Total occupants, Damage, Narrative, Accident report]
16-Jun-2024 16:53 ASN Updated [Narrative]
17-Jun-2024 15:48 ASN Updated [Category]

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