Serious incident Airbus A320-251N VT-ISV,
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ASN Wikibase Occurrence # 277180
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Date:Friday 7 January 2022
Time:03:25 UTC
Type:Silhouette image of generic A20N model; specific model in this crash may look slightly different    
Airbus A320-251N
Owner/operator:IndiGo Airlines
Registration: VT-ISV
MSN: 10559
Year of manufacture:2021
Engine model:CFMI CFM LEAP-1A26E1
Fatalities:Fatalities: 0 / Occupants:
Aircraft damage: None
Category:Serious incident
Location:near Bengaluru -   India
Phase: Initial climb
Nature:Passenger - Scheduled
Departure airport:Bengaluru (Bangalore) International Airport (BLR/VOBL)
Destination airport:Bhubaneswar-Biju Patnaik International Airport (BBI/VEBS)
Investigating agency: AAIB India
Confidence Rating: Accident investigation report completed and information captured
IndiGo Airlines flight 6E455, an Airbus A320neo (VT-ITD) and IndiGo Airlines flight 6E246, an Airbus A320neo (VT-ISV) where involved in serious airprox incident near Bengaluru Airport, India.

Segregated parallel operations were being conducted at Bengaluru Airport in which runway 09L was used exclusively for approaches and the other runway 09R was used exclusively for departures. Both runways were 1925 m (approx. 1.04 NM) apart. Subsequently, ATC decided to change from segregated parallel operations to single runway operations in which runway 09L was required to be used for both departures and arrivals.
The incident took place when both aircraft were allowed to depart simultaneously from parallel runways 09L and 09R respectively. Simultaneous departures from both runways did not have the approval of the DGCA India. RNAV-1 SIDs for departures from runways 09L and 09R were merging at a waypoint BL401 which was about 6 NM from the runway 09R end.
However, when flight 455, after departure from runway 09R, just initiated a turn to waypoint BL401, the Approach Departure controller detected the potential conflict and issued conflict avoidance instructions to both aircraft. The time flight 455, in compliance with ATC instructions, started turning right, the separation between the two aircraft reduced to 0.9 NM laterally and 100 feet vertically. Subsequently, the required separation was re-established and both flights continued to their destinations as per ATC clearances.

Probable Cause (s):
The serious incident is attributable to the fact that the ATC allowed simultaneous departures from two parallel instrument runways which were not permitted at KIA Bengaluru resulting into an air-proximity.
Contributory Factors:
The following were identified as contributing factors to the serious incident:
a) Inadequate number of air traffic controllers for supporting segregated mode of operations on parallel runways at ATS Bengaluru;
b) Inadequate supervision in the aerodrome control tower due to fallacious policy of management of supervisor at ATS Bengaluru.
c) Inadequate coordination between TWR-1 and TWR-2 controllers, ineffective coordination between WSO/TWR-1 controller and TWR SUP/SMC-1 controller and inadequate coordination by TWR-1 with Approach Departure controller;
d) Design of SIDs was not suitable for dealing with the risk due to simultaneous departures from parallel runway 09L and 09R;
e) Lack of teamwork in the shift;
f) Inadequate Safety Risk Management and Safety Assurance;
g) Inadequate coordination procedures for transition from segregated parallel operations to single runway operations and vice-versa; and
h) Absence of a comprehensive SOPs and associated checklists for safe and efficient transition from one mode of runway operations to other mode of operations.


AAIB India

Revision history:

07-Apr-2022 14:04 harro Added
07-Apr-2022 14:05 harro Updated [Narrative]
07-Apr-2022 18:03 harro Updated [Date]

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