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Mint
3 days ago
- General
- Mint
A Second-by-Second Timeline of How Air Indias Dreamliner Flight Ended in Disaster
New Delhi, Jul 12 (PTI) London-bound Air India flight AI171 crashed 32 seconds after takeoff from Ahmedabad on June 12, after fuel supply to both engines was cut off within a second of each other. A preliminary report found that the confused pilots were unable to restore thrust in time. Here is a look at the sequence of events leading to the deadly crash: 11:17 Hrs IST: Air India Dreamliner VT-ANB lands in Ahmedabad from New Delhi, operating as flight AI423 13:13:00 Hrs: Aircraft requests pushback and start up 13:13:13 Hrs: ATC approved pushback 13:16:59 Hrs: ATC approved start up. 13:18:38 Hrs: Aircraft departs from Bay 34 at Ahmedabad's Sardar Vallabhbhai Patel International Airport 13:19:12 Hrs: ATC queried if the aircraft required the full length of the runway. The aircraft confirmed the requirement of full length of Runway 23. 13:25:15 Hrs: Aircraft requests taxi clearance, which was granted by air traffic control (ATC) 13:26:00 Hrs: Aircraft taxis to Runway 23 via Taxiway R4, backtracked and lined up for take-off 13:32:03 Hrs: Aircraft transferred from ground to tower control 13:33:45 Hrs: Aircraft instructed to line up on the Runway 23 13.37:37 Hrs: ATC clears take-off from Runway 23 13.37:37 Hrs: Takeoff roll starts 13:38:39 Hrs: Liftoff from runway 13:38:42 Hrs: Maximum speed of 180 knots reached Immediately thereafter, both Engine 1 and Engine 2 fuel cutoff switches move from RUN to CUTOFF positions, one second apart. Engines begin to slow as fuel supply is cut off. Ram Air Turbine (RAT) deployed during the initial climb immediately after lift-off. One pilot is heard asking the other why he cut off fuel. The other answers that he has not done so 13:38:47 Hrs: Both Engine N1 and N2 drop below minimum idle speed. The RAT's pump begins supplying hydraulic power. 13:38:52 Hrs: Engine N1 fuel cutoff switch moves to RUN from CUTOFF 13:38:56 Hrs: Engine N2's fuel cutoff switch too rest to RUN Both engines relight, and Engine 1 begins to recover. Engine 2 is unable to reverse deceleration 13:39:05 Hrs: One of the two pilots issues a distress "MAYDAY, MAYDAY, MAYDAY" call 13:39:11 Hrs: Data recording from the aircraft stops 13:44:44 Hrs: Fire tenders leave airport premises for rescue and firefighting
Indian Express
4 days ago
- General
- Indian Express
How Air India's Dreamliner flight ended in disaster: A second-by-second timeline
A preliminary report into the crash of the Air India Boeing 787 Dreamliner in Ahmedabad that killed 260 people last month reveals that both of the aircraft's engines were starved of fuel almost simultaneously, just moments after takeoff. The findings, released Saturday by Indian aviation authorities, provide the most detailed account of the incident on June 12. Below is a second-by-second reconstruction of events leading up to the crash, based on the report: 11:17 am: Air India Dreamliner VT-ANB lands in Ahmedabad from New Delhi as flight AI423. 1:18:38 pm: The aircraft is observed departing from Bay 34 at the airport. 1:25:15 pm: The crew requests taxi clearance, which is granted by air traffic control. The aircraft begins taxiing toward Runway 23 via Taxiway R4, backtracks, and lines up for departure. 1:32:03 pm: The flight is transferred from ground control to tower control. 1:37:33 pm: Takeoff clearance is issued. 1:37:37 pm: The aircraft begins its takeoff roll. 1:38:39 pm: The aircraft lifts off. Investigators note that the air/ground sensors transition to air mode, consistent with liftoff. 1:38:42 pm: The aircraft reaches a maximum airspeed of 180 knots. Immediately after, both Engine 1 and Engine 2 fuel cutoff switches transition from 'RUN' to 'CUTOFF' positions, one after the other with a one-second gap. 'The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off.' One of the pilots is heard asking the other why did he cutoff. The other pilot responded that he did not do so. Airport CCTV footage shows the Ram Air Turbine (RAT) deploying during the initial climb, shortly after liftoff. 'The aircraft started to lose altitude before crossing the airport perimeter wall,' the investigation noted. 1:38:47 pm: Both engines' values drop below minimum idle speed. The RAT's hydraulic pump begins supplying hydraulic power. 1:38:52 pm: Engine 1's fuel cutoff switch is moved back from 'CUTOFF' to 'RUN.' 1:38:56 pm: Engine 2's fuel cutoff switch is similarly reset to 'RUN.' The probe report reads: 1:39:05 pm: One of the pilots issues a distress call: 'MAYDAY MAYDAY MAYDAY.' 1:39:11 pm: Data recording from the aircraft stops. 1:44:44 pm: Crash fire tenders leave the airport premises for rescue and firefighting efforts.
Time of India
4 days ago
- General
- Time of India
Air India plane crash: Previous crew logged defect report related to flight's stabilizer sensor, reveals probe findings
Live Events (You can now subscribe to our (You can now subscribe to our Economic Times WhatsApp channel The Aircraft Accident Investigation Bureau's (AAIB) preliminary findings on the fatal Air India Boeing 787-8 crash reveal that the flight's previous crew had reported a stabilizer sensor defect earlier on the same day of the accident that killed 241 onboard the Boeing the defect report, Air India's on-duty maintenance engineer conducted troubleshooting, and the aircraft was cleared for flight."The Flight AI171 had arrived in Ahmedabad earlier that day as AI423 from Delhi. The previous crew had logged a defect report related to a stabilizer sensor ('STAB POS XDCR'). Air India's on-duty maintenance engineer conducted troubleshooting, and the aircraft was cleared for flight," said the its 15-page report, the investigation bureau said that once the aircraft achieved its top recorded speed, "the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec"."In the cockpit voice recording, one of the pilots is heard asking the other why did he cutoff. The other pilot responded that he did not do so," it aircraft quickly began to lose switches then returned to the "RUN" position and the engines appeared to be gathering power, but "one of the pilots transmitted 'MAYDAY MAYDAY MAYDAY'", the report traffic controllers asked the pilots what was wrong, but then saw the plane crashing and called emergency personnel to the India was compliant with all airworthiness directives and alert service bulletins on the aircraft, the report investigations bureau said there were "no recommended actions to B787-8 and/or GE GEnx-1B engine operators and manufacturers", suggesting no technical issues with the engines (GE) or the aircraft (Boeing).Boeing said in a statement it will "continue to support the investigation and our customer", adding "our thoughts remain" with those affected by the UN's International Civil Aviation Organization (ICAO) stipulates that states heading an investigation must submit a preliminary report within 30 days of an accident.
NDTV
4 days ago
- General
- NDTV
Inside The Cockpit: How Air India Flight Ended In Disaster
A preliminary report into the Air India crash that killed 260 people last month showed the plane's engines fuel cutoff switches almost simultaneously flipped from run to cutoff, starving the engines of fuel. Here is the sequence of events - by the seconds - on June 12, as detailed by Indian investigators in their preliminary report released on Saturday: 11:17 AM: Air India Dreamliner VT-ANB landed in Ahmedabad from New Delhi as AI423. 1:18:38 PM: The aircraft was observed departing from Bay 34 at the airport. 01:25:15 PM: The aircraft requested taxi clearance, which was granted by air traffic control; a minute later the aircraft taxied from the bay to Runway 23 via Taxiway R4, backtracked and lined up for take-off. 01:32:03 PM: The aircraft was transferred from ground to tower control. 01:37:33 PM: Take-off clearance issued. 01:37:37 PM: The aircraft started rolling. 01:38:39 PM: Aircraft lifted off. "The aircraft air/ground sensors transitioned to air mode, consistent with liftoff," the report said. 01:38:42 PM: Aircraft reached max airspeed of 180 knots. "Immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec." "The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off. "In the cockpit voice recording, one of the pilots is heard asking the other why did he cutoff. "The other pilot responded that he did not do so "The CCTV footage obtained from the airport showed Ram Air Turbine (RAT) getting deployed during the initial climb immediately after lift-off "The aircraft started to lose altitude before crossing the airport perimeter wall." 01:38:47 PM: both engines' values "passed below minimum idle speed", and the RAT hydraulic pump began supplying hydraulic power. 01:38:52 PM: Engine 1 fuel cutoff switch transitioned from CUTOFF to RUN. 01:38:56 PM: Engine 2 fuel cutoff switch also transitions from CUTOFF to RUN. "When fuel control switches are moved from CUTOFF to RUN while the aircraft is inflight, each engines full authority dual engine control (FADEC) automatically manages a relight and thrust recovery sequence of ignition and fuel introduction." "Engine 1's core deceleration stopped, reversed and started to progress to recovery. Engine 2 was able to relight but could not arrest core speed deceleration and re-introduced fuel repeatedly to increase core speed acceleration and recovery." 01:39:05 PM: One of the pilots transmitted "MAYDAY MAYDAY MAYDAY". 01:39:11 PM: Data recording stopped.
Economic Times
4 days ago
- General
- Economic Times
Air India plane crash report out; Both engines 'cut off' mid-air '01 second apart', pilots in cockpit left confused about cause
A preliminary report is out regarding the Air India plane crash in Ahmedabad. The Aircraft Accident Investigation Bureau released the 15-page document. It reveals both engines of flight AI171 failed shortly after takeoff. The pilots did not initiate the engine shutdown. The Boeing 787 crashed just outside the airport perimeter. The crash resulted in at least 270 fatalities. Tired of too many ads? Remove Ads Tired of too many ads? Remove Ads The Aircraft Accident Investigation Bureau (AAIB) on wee hours of Saturday released a 15-page preliminary report on the Air India plane that crashed a month ago in Ahmedabad, killing at least 270 per the report, both engines of the ill-fated flight AI171, a Boeing Dreamliner, 'cut off' seconds after take-off from Ahmedabad, and neither pilot acknowledged triggering the AI171 had arrived in Ahmedabad earlier that day as AI423 from Delhi. The previous crew had logged a defect report related to a stabilizer sensor ('STAB POS XDCR'). Air India's on-duty maintenance engineer conducted troubleshooting, and the aircraft was cleared for AAIB report confirms that the twin-engine failure occurred at 1.38 PM IST, less than a minute after the aircraft became airborne from Runway 23. The Boeing 787-8 aircraft, bound for London Gatwick with 230 people onboard, crashed just outside the airport perimeter on June 12."The aircraft achieved the maximum recorded airspeed of 180 Knots IAS at about 08:08:42 UTC and immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec. The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off," the report to the findings so far, the Cockpit Voice Recorder (CVR) captured one pilot asking, 'Why did you cutoff?' to which the other responded, 'I didn't do so.' Seconds later, the Ram Air Turbine (RAT), a backup power device, deployed automatically, indicating total loss of engine thrust , as per the CCTV footage examined."The aircraft started to lose altitude before crossing the airport perimeter wall," the report further CCTV footage confirmed RAT deployment during initial climb. No significant bird activity was recorded in the vicinity of the flight to the flight data, by 08:08:47 UTC, the N2 values of both engines had dropped below the minimum idle speed, prompting the RAT hydraulic pump to begin supplying power. At 08:08:52 UTC, the fuel cutoff switch for Engine 1 was moved back to RUN. The APU Inlet Door opened at 08:08:54 UTC, consistent with automatic start logic. Two seconds later, the Engine 2 switch also returned to these switches are moved back to RUN in-flight, the aircraft's engine control system (FADEC) initiates a relight process by reintroducing fuel and ignition. The Exhaust Gas Temperature (EGT) readings began rising, indicating relight 1's core speed loss reversed and began recovery. Engine 2, though it managed to relight, could not stop its core speed from falling and kept reintroducing fuel to accelerate. At 08:09:05 UTC, one of the pilots made a 'MAYDAY MAYDAY MAYDAY' call. The Air Traffic Controller asked for the aircraft's call sign but received no aircraft crashed outside the airport boundary. The final recording from the flight data system stopped at 08:09:11 UTC.
