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Last updated: 27 July 2021
Status:Definitief
Datum:vrijdag 12 oktober 2018
Tijd:01:18
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8HG (WL)
Luchtvaartmaatschappij:Air India Express
Registratie: VT-AYD
Constructienummer: 36340/3122
Bouwjaar: 2009-12-02 (8 years 11 months)
Aantal vlieguren:29719
Aantal vluchten:10023
Motoren: 2 CFMI CFM56-7B27
Bemanning:slachtoffers: 0 / inzittenden: 6
Passagiers:slachtoffers: 0 / inzittenden: 130
Totaal:slachtoffers: 0 / inzittenden: 136
Schade: Groot
Gevolgen: Repaired
Plaats:Tiruchirappalli-Civil Airport (TRZ) (   India)
Fase: Start (TOF)
Soort vlucht:Internationale lijnvlucht
Vliegveld van vertrek:Tiruchirappalli-Civil Airport (TRZ/VOTR), India
Vliegveld van aankomst:Dubai Airport (DXB/OMDB), Verenigde Arabische Emiraten
Vluchtnummer:IX611
Beschrijving:
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


Veiligheidsmaatregelen

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

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Foto's

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

Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Tiruchirappalli-Civil Airport en Dubai Airport bedraagt 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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