The National Transportation Safety Board ( NTSB ) determined Deciding that the cause Causation of the accident was pilot error .

On May 1 , 2007 , the National Transportation Safety Board ( NTSB ) stated Statement that the probable cause of the crash Catastrophe was pilot error .

The leader of the National Transportation Safety Board ( NTSB ) team investigating Criminal_investigation said Statement it was likely that the accident would have been prevented Preventing_or_letting had positive train control Control ( PTC ) been installed Placing .

The National Transportation Safety Board report included Cause_to_be_included the true work rosters , obtained Getting by the family of a victim .

In 1991 , prompted Causation in large part by the Chase Maryland crash , the United States Congress took even broader action and authorized mandatory random drug-testing for all employees in `` safety-sensitive '' jobs in all industries regulated Limiting by the U.S. Department of Transportation ( DOT ) including trucking , bus carriers and rail systems .

The final report , published Publishing by the Indonesian National Transportation Safety Committee , found Know no evidence of technical faults in the aircraft .

As the ECAA lacked the resources of the much larger U.S. National Transportation Safety Board ( NTSB ) , the Egyptian government asked Request the NTSB to handle Hold the investigation Criminal_investigation .

After investigating Research the accident , the National Transportation Safety Board ( NTSB ) found Know it had been caused Causation by the track stretching Expansion to an excessive gauge at the point of derailment .

The investigation Criminal_investigation carried out Military_operation by the Transportation Safety Board of Canada ( TSB ) concluded that flammable material used in the aircraft 's structure allowed Preventing_or_letting a fire to spread Dispersal beyond the control of the crew , resulting in Causation the crash Catastrophe of the aircraft .

The National Transportation Safety Board ( NTSB ) concluded Coming_to_believe that the flight crew were unaware of the amount of ice that had built Building up after the jet was delayed Change_event_time by heavy ground traffic taxiing to the runway .

In December 2015 , the Indonesian National Transportation Safety Committee ( KNKT or NTSC ) released Publishing a report Reporting concluding Protest that a non-critical malfunction in the rudder control Control system prompted Cause_change_of_position_on_a_scale the captain to perform Hold a non-standard reset of the on-board flight control Control computers .

The National Transportation Safety Board ( NTSB ) found Know that as the aircraft was beginning Process_start its takeoff rotation , engine number one ( the left engine ) separated Forming_relationships from the left Departing wing , flipping Self_motion over the top of the wing and landing Arriving on the runway .

According to the National Transportation Safety Board ( NTSB ) , which investigated Criminal_investigation the cause of the collision , the Metrolink train ran through Motion a red signal before entering Arriving a section of single track where the opposing freight train had been given Giving the right of way by the train dispatcher .

The accident was investigated Check by the Transportation Safety Board of Canada ( TSB ) , with a final report Reporting issued on 13 December 2007 .

The investigation Scrutiny by the U.S. National Transportation Safety Board concluded Statement that the accident was the result Causation of the flight crew 's mismanagement of the airplane 's final approach Arriving to the airport .

In response Response to lack of confidence in accident investigations Scrutiny by the CASB , the Government of Canada shut down Being_in_operation that board in 1990 , replacing Change_of_leadership it with an independent , multi-modal investigative agency – the Transportation Safety Board of Canada .

Accident investigators from the National Transportation Safety Board ( NTSB ) traveled Traveling to the scene , arriving Arriving the following morning amid speculation that a terrorist Terrorism attack was the cause Causation of the crash .

In the National Transportation Safety Board report on the crash Catastrophe , investigators concluded Coming_to_believe that the likely cause Causation of the crash Attack was pilot error .

The cause of the crash was independently investigated Criminal_investigation by two agencies in two countries : the United States National Transportation Safety Board ( NTSB ) and the Indonesian National Transportation Safety Committee ( NTSC ) .

The cause of the crash was independently investigated Criminal_investigation by two agencies in two countries : the United States National Transportation Safety Board ( NTSB ) and the Indonesian National Transportation Safety Committee ( NTSC ) .

The National Transportation Safety Board ( NTSB ) investigation Scrutiny found Know that , while the bus driver was not aware that a portion of the bus was on the tracks as she should have been , the timing of signals was so insufficient that , even if she had identified Check the hazard as the train approached Arriving , she would have had to proceed Self_motion against a red traffic signal into the highway intersection to have moved Motion out of the train 's path .

The National Transportation Safety Board ruled Legal_rulings that the derailment Catastrophe was caused Causation by the train 's engineer ( driver ) becoming Becoming distracted by other radio transmissions and losing Earnings_and_losses situational awareness , and said Statement that it would have been prevented Preventing_or_letting by positive train control , a computerized speed-limiting system that was operational Being_in_operation elsewhere on the Northeast Corridor , but whose activation Being_in_operation at the wreck site had been delayed Hindering due Causation to regulatory requirements .