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Last updated: 19 September 2021
Status:Final
Date:Friday 12 October 2018
Time:01:18
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8HG (WL)
Operator:Air India Express
Registration: VT-AYD
MSN: 36340/3122
First flight: 2009-12-02 (8 years 11 months)
Total airframe hrs:29719
Cycles:10023
Engines: 2 CFMI CFM56-7B27
Crew:Fatalities: 0 / Occupants: 6
Passengers:Fatalities: 0 / Occupants: 130
Total:Fatalities: 0 / Occupants: 136
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:Tiruchirappalli-Civil Airport (TRZ) (   India)
Phase: Takeoff (TOF)
Nature:International Scheduled Passenger
Departure airport:Tiruchirappalli-Civil Airport (TRZ/VOTR), India
Destination airport:Dubai Airport (DXB/OMDB), United Arab Emirates
Flightnumber:IX611
Narrative:
Air India Express flight 611, a Boeing 737-800, impacted the localizer antenna and an airport wall on takeoff from Tiruchirappalli International Airport, India.
The aircraft was operating a regular flight to Dubai. It was cleared for takeoff from runway 27 at 01:18 local time. As the aircraft accelerated through a speed of 117 knots, the captain's seat recliner mechanism failed. As the captain became unsettled, the throttle levers and control column were moved back inadvertently. He handed over control to the co-pilot for five seconds.
After adjusting his seat the captain took control back from the co-pilot and the take off was continued.
Both crew members failed to notice drop in engine thrust from 98% to 77%. And since the Auto Throttle was in Throttle Hold mode above 84 kts, the thrust remained at 77%.
At 144 knots, some 2000 feet short of the runway end, the captain raised the nose of the aircraft for rotation. he noticed a slower rotation rate and that a higher control column force was required than normal. He increased the control column force aft in order to get airborne. This caused a higher rotation rate and a pitch angle of 10.7 degrees which lead to tail strike on the undulated soft surface past the end of the runway for 17 meters followed by the aft fuselage contacting the localizer antenna and boundary wall. Both main landing gears also impacted the brick boundary wall, causing two holes.
The aircraft climbed to FL360 and proceeded towards Dubai because all systems were normal. While en route the operations department insisted upon a diversion to Mumbai. At that time the flight was well over the Arabian Sea. The aircraft landed safely at Mumbai at 05:38 local time.

Probable Cause:

PROBABLE CAUSE OF THE ACCIDENT: Delayed take-off due to reduction of take-off thrust N1 from 98 % to 77 % before reaching V1, inability of both the crew members to monitor the thrust parameters and to take timely corrective action. This resulted in tail strike and subsequent hitting of the localizer Antenna and boundary wall of the airport.
Contributory factors:
- PIC seatback recliner mechanism failure during take-off roll.
- Breakdown of Crew coordination during switching between PF, PM and back.
- Loss of situational awareness

Accident investigation:
cover
Investigating agency: AAIB India
Status: Investigation completed
Duration: 2 years and 4 months
Accident number: final report
Download report: Final report

Classification:
Collision with approach or runway lights
Runway excursion

METAR Weather report:
19:30 UTC / 01:00 local time:
VOTR 111930Z 00000KT 5000 BR FEW018 SCT100 27/24 Q1008 NOSIG

20:00 UTC / 01:30 local time:
VOTR 112000Z 00000KT 5000 BR FEW018 SCT100 27/24 Q1007 NOSIG


Follow-up / safety actions

issued 4 Safety Recommendations
VOTR issued 1 Notice to Airmen (Notam)

Show all...

Photos

photo of Boeing-737-8HG-VT-AYD
departure track
photo of Boeing-737-8HG-VT-AYD
flight track
photo of Boeing-737-8HG-VT-AYD
accident date: 12-10-2018
type: Boeing 737-8HG (WL)
registration: VT-AYD
 

Video, social media

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Tiruchirappalli-Civil Airport to Dubai Airport as the crow flies is 2924 km (1827 miles).
Accident location: Exact; deduced from official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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