The preliminary report of the NTSB on the LaGuardia Airport accident revealed how control error, communication breakdown, and ASDE-X system failure led to a fatal runway collision.
Control decision, communication breakdown, and system failures failed simultaneously
The preliminary report published by the National Transportation Safety Board (NTSB) in the United States revealed that the fatal runway collision at LaGuardia Airport was not caused by a single error, but by the simultaneous failure of multiple safety layers.
According to the report, air traffic control decisions, uncertainties in radio communication, and limitations in critical technological systems made the sequence of events leading to the accident irreversible within seconds.
Aircraft on approach and rescue vehicle directed to the same runway
At approximately 23:37 on the night of March 22, Flight 646 operated by Jazz Aviation on behalf of Air Canada collided with an airport rescue vehicle on the runway during its landing approach.
While the aircraft was on short final, approximately a quarter mile from the runway and about 130 feet above the ground, the local controller in the tower cleared the rescue vehicle to cross the active runway. The “stop” instruction issued seconds later was not enough to prevent the accident.
As a result of the collision, two pilots lost their lives, while dozens of passengers and emergency personnel were injured.
“Stop” call delayed, unclear who it was directed to
According to NTSB findings, ambiguity in radio communication played a critical role. The rescue vehicle crew did not understand that the initial “stop” call was directed at them.
The report states that the vehicle operator first heard a general “stop stop stop” transmission but could not determine who it was intended for; only later realizing it was directed specifically at their vehicle. This delay failed to prevent the vehicle from proceeding onto the runway.
Tower workload and pressure of multiple operations
At the time of the accident, two experienced controllers were on duty in the tower, which was in line with standard operational staffing. However, multiple critical operations being conducted simultaneously increased distraction.
An aircraft that aborted takeoff twice and a separate emergency in the terminal area increased the workload on the tower. The local controller managing both ground and tower frequencies made the communication flow more complex.
ASDE-X system did not generate a warning
One of the most critical technical findings in the report was that the surface surveillance system ASDE-X did not activate.
Under normal conditions, the system is expected to detect potential conflicts on the runway and alert controllers both audibly and visually, yet it produced no warning at the time of the accident.
One of the main reasons cited was that some ground vehicles did not carry transponders. This caused the system to detect vehicles on the field incompletely and intermittently. At the time of the accident, it was determined that the system could not track seven vehicles individually and displayed only two targets.
Runway lights turned off at the last moment
Another safety layer expected to prevent the accident, the Runway Entrance Lights (REL), also failed at a critical moment.
According to video recordings, the lights were active as the aircraft approached and the vehicles were waiting near the runway entry point. However, just before the vehicle reached the runway, the lights were observed to switch off, and they went completely dark only seconds before the collision.
This indicates that the visual warning system was also ineffective at the critical moment.
Wreckage distribution and cabin survivability
According to NTSB examinations, the wreckage field spread over an area approximately 300 feet long and 150 feet wide. Detailed analysis was conducted using drone imaging, GPS mapping, and laser scanning technologies.
While most of the damage was concentrated in the front section of the aircraft, the cockpit and forward cabin suffered severe structural destruction. In contrast, the passenger cabin largely maintained its integrity, with most seats remaining in place and damage being limited.
Evacuation process: Control within chaos
Cabin crew stated that the flight proceeded normally up until the collision. The rear cabin attendant described the moment of impact as a severe jolt and reported being unable to establish communication with the cockpit.
Despite darkness and uncertainty, all passengers were evacuated through all exits, and the process was brought under control despite the initial chaos, the report noted.
Why did the multi-layer system collapse?
According to the NTSB, this accident became a striking example of how the multi-layered safety structure of modern aviation can weaken simultaneously.
It once again demonstrated that when human factors, communication clarity, and technological support systems fail to complement each other, fatal outcomes can emerge within seconds.
It was stated that the findings in the report are preliminary in nature and may be updated during the final investigation process.
NTSB Preliminary Report Multi-Layer System Failure in LaGuardia Runway Disaster
