In the 15 -page report of Aaib (Aircraft Accident Investigation Bureau) in the Air India aircraft accident, very shocking revelations have been made. The report explained the entire 98 seconds of the AI171 flight in detail. The flight going to London crashed immediately after flying from Ahmedabad. 241 people were killed in this accident, only one passenger survived.
AI171 took off after getting permission to fly at 1:37 pm. This Boeing 787-8 Dreamliner could stay in the air for only 32 seconds, after which he crashed. According to the initial report, by 1:38 pm, the speed of an engine was 284 kilometers per hour during the takeoff roll. In the next two seconds, the aircraft achieved VR speed (rotation speed) – which was 287 km per hour. Four seconds after this, the aircraft left the ground and reached the air.
Also read: ‘Investigation is still going on, we cannot say anything …’, What did AI171 say on the plane crash report?
Rat did not work due to low height
In the report, the aircraft’s take-up information has been given and it is reported that the speed of the aircraft was recorded at 334 km per hour after going into the air. Soon after, the report stated that the engine of the aircraft stopped, and the aircraft started losing its thrust. RAT i.e. Ram Air Turbine was deployed to increase height.
RAT is run when the engine fails due to a problem or the hydraulic system stops working. Aviation experts say that the air flow at the lower height is low and then RAT works. It works only when the aircraft is at higher height in the sky.
From Delhi to Ahmedabad and flying to London:
05:47 UTC – Aircraft (AI423) reached Ahmedabad from Delhi
06:40 UTC – Aircraft released for flight after technical investigation
06:25 UTC – Crew’s breath analyzer test – all found fit
07:05 UTC (12:35 IST) – Crew was seen reaching boarding gate in CCTV
07:48:38 UTC – Aircraft departed from Bay 34
07:55:15 UTC – Taxi clearance received
07:56:08 UTC – Taxi started
08:07:33 UTC – Techoff clearance
08:07:37 UTC – Aircraft started takeoff rolls
08:08:33 UTC – V1 Speed (153 Kts IAS)
08:08:35 UTC – VR Speed (155 Kts)
08:08:39 UTC – Aircraft released land (air/ground sensor in air mode)
08:08:42 UTC – Maximum air speed recorded 180 kts IAS
Right then – Engine fuel cutoff switches of 1 and 2 were made in cutoff mode
08:08:47 UTC – RAT (Ram Air Turbine) deployed; Aircraft began to lose height
08:08:52 UTC – Fuel cutoff switch of engine 1 again inserted into run mode
08:08:54 UTC – APU inlet begins to open from door auto start logic
08:08:56 UTC – Engine 2 fuel cutoff switch again in Run mode
08:09:05 UTC – Mayday call given
08:09:11 UTC – EAFR recording closed, plane crashes
The aircraft crashed immediately after giving Mayday call
According to the report, the fuel cutoff switch of the engine 1 was inserted into the run mode after five seconds, which led to the indication of engine recovery. After two seconds, APU Inlet started opening from door auto start logic. The engine 2 also started going into stable mode after two seconds.
Also read: ‘Why did you turn off the fuel …’, Pilot’s conversation in the cockpit before Air India Plane Crash
The report said that the engine 1 had stopped the decline of its core speed, causing it to start again. At the same time, the engine 2 could not stop the decline of its core speed, due to which it could not come back to the full function again.
Mayday call at 1:39 pm (08:09:05 UTC). Six seconds later, 08:09:11 On UTC, EAFR stopped recording. According to the report, the Air Traffic Control Officer sought an answer on the Mayday call, but no response was received, as by then the aircraft had crashed outside the airport boundary.
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