India's AAIB has released its Preliminary Report into the crash of AI flight 171:
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. 
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. (my highlight FDD)
As per the EAFR data both engines N2 values passed below minimum idle speed, and the  RAT hydraulic pump began supplying hydraulic power at about 08:08:47 UTC.
As per the EAFR, the Engine 1 fuel cutoff switch transitioned from CUTOFF to RUN at about  08:08:52 UTC. The APU Inlet Door began opening at about 08:08:54 UTC, consistent with  the APU Auto Start logic. Thereafter at 08:08:56 UTC the 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.  The EGT was observed to be rising for both engines indicating relight. 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. The EAFR recording stopped at 08:09:11  UTC At about 08:09:05 UTC, one of the pilots transmitted “MAYDAY MAYDAY MAYDAY”. The  ATCO enquired about the call sign. ATCO did not get any response but observed the aircraft  crashing outside the airport boundary and activated the emergency response. At 08:14:44 UTC, Crash Fire Tender left the airport premises for Rescue and firefighting. They  were joined by Fire and Rescue services of Local Administration.
The flap handle assembly sustained significant thermal damage. The handle was  found to be firmly seated in the 5-degree flap position, consistent with a normal takeoff flap  setting. The position was also confirmed from the EAFR data. The landing gear lever was in  “DOWN” position.
The thrust lever quadrant sustained significant thermal damage. Both thrust levers were found  near the aft (idle) position. However, the EAFR data revealed that the thrust levers remained  forward (takeoff thrust) until the impact. Both fuel control switch were found in the “RUN”  position. (fig.13) The reverser levers were bent but were in the “stowed” position. The wiring  from the TO/GA switches and autothrottle disconnect switches were visible, but heavily  damaged.
The aircraft is equipped with two Enhanced Airborne Flight Recorders (EAFR) part number  866-0084-102. The EAFR are fitted at two locations, one in the tail section at STA 1847 and  other in the forward section at STA 335. The two EAFRs are similar in construction and record  a combined data stream of digital flight data and cockpit voice information, with both stored  on the same device.
The downloaded flight data contained approximately 49 hours of flight data and 6 flights,  including the event flight. The recovered audio was two hours in length and captured the  event. Initial Analysis of the recorded audio and flight data has been done.
LINK: 
https://t.co/7oXkzRTlUm