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Last updated: 27 July 2021
Statuts:Enquête Officielle
Date:vendredi 12 octobre 2018
Heure:01:18
Type/Sous-type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8HG (WL)
Compagnie:Air India Express
Immatriculation: VT-AYD
Numéro de série: 36340/3122
Année de Fabrication: 2009-12-02 (8 years 11 months)
Heures de vol:29719
Cycles:10023
Moteurs: 2 CFMI CFM56-7B27
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 130
Total:victimes: 0 / à bord: 136
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Tiruchirappalli-Civil Airport (TRZ) (   Inde)
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Intern.
Aéroport de départ:Tiruchirappalli-Civil Airport (TRZ/VOTR), Inde
Aéroport de destination:Dubai Airport (DXB/OMDB), Emirats Arabes Unis
Numéro de vol:IX611
Détails:
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 niotied 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

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


Opérations de secours

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

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Tiruchirappalli-Civil Airport et Dubai Airport est de 2924 km (1827 miles).
Accident location: Exact; deduced from official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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