The plane accident investigation Bureau's preliminary document into air india Flight 171 is dense with aviation terminology that facilitates explain how investigators decided both engine fuel cutoff switches "transitioned from RUN to CUTOFF position one after every other with a time gap of 01 sec." knowledge those technical terms is essential to grasping what occurred throughout the ones deadly 32 seconds after takeoff.
The important thing technical phrases that depend:
EAFR (improved Airborne Flight Recorder): The file centres on information from the aircraft's eafrs, which integrate conventional "black field" functions into single gadgets recording both flight facts and cockpit voice communications. The forward EAFR supplied the essential timeline displaying precisely when gas switches moved and engines started out dropping strength.
Gas control Switches - RUN vs CUTOFF: those spring-loaded switches beneath the throttle handles control gasoline waft to each engine. The report's finding that each moved from "RUN" to "CUTOFF" inside one 2d represents the accident's crucial mystery-investigators nonetheless do not know what prompted this motion.
RAM air Turbine (RAT): when both engines failed, this emergency windmill robotically deployed to provide backup electric and hydraulic power.
V1, Vr, and V2 speeds: vital take-off velocities that determine plane competencies. V1 (153 knots) is the choice velocity past which takeoff need to preserve; Vr (one hundred fifty five knots) is rotation speed for liftoff; V2 (162 knots) is the secure hiking speed. The engines failed just after attaining most speed of a hundred and eighty knots, past all protection margins.
FADEC (complete Authority wallet PLATFORM' target='_blank' title='digital-Latest Updates, Photos, Videos are a click away, CLICK NOW'>digital Engine manipulate): this is a connection with the laptop systems that mechanically manage engine operations. When gas switches back to "RUN," FADEC structures initiated computerized reignition sequences on each engines-but insufficient time and altitude avoided successful restart.
Mayday name: The worldwide misery signal transmitted via the crew at 08:09:05 UTC. This general emergency assertion came simply 23 seconds after gasoline cut-off and simplest six seconds earlier than the recording ended, displaying how swiftly the scenario deteriorated.
UTC Timestamp: All times within the record use Coordinated prevalent Time to offer particular chronology. The 29-second span from gasoline cutoff (08:08:forty two) to recording end (08:09:11) represents the complete emergency collection.
Initial climb segment: that is one of the maximum critical flight intervals when plane are low, sluggish, and susceptible. It changed into in this segment that the plane crashed.
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