Investigation Summary
The accident occurred during a period of heavy rain and reduced visibility at LaGuardia Airport, with visibility reported at 3 miles (4.8 km). Earlier that night, United Airlines Flight 2384 had aborted its takeoff twice and declared an emergency due to a foul odor in the cabin. Because no gates were available, airport firefighting and stair trucks were dispatched to assist the United aircraft. At 11:37 p.m., an air traffic controller cleared 'Truck 1 and company' to cross Runway 4 at taxiway Delta. At this time, Flight 8646 was on short final approach. Realizing the conflict, the controller issued multiple urgent commands for the truck to stop, but the collision occurred seconds later at 11:38 p.m. The aircraft struck the rear-right side of the Oshkosh Striker 1500 truck at a recorded ground speed of 90 knots, causing the truck to roll over and the aircraft's nose section to be demolished. The NTSB noted that the firefighting truck was not equipped with an ASDE-X transponder, which may have impacted the effectiveness of the airport's surface detection and warning systems.
Final Conclusions
The investigation is ongoing. The National Transportation Safety Board (NTSB) released a preliminary report on April 23, 2026. Key findings to date include the fact that the firefighting truck lacked an ASDE-X transponder and that the controller cleared the vehicle to cross the active runway while the landing aircraft was on short final. The NTSB is currently analyzing the Cockpit Voice Recorder (CVR) and Flight Data Recorder (FDR) for flight data and communications. Separately, investigators are examining Airport Surface Detection Equipment (ASDE) replays to determine why the runway warning systems did not alert the controller or prevent the collision.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
ASDE-X
Airport Surface Detection Equipment, Model X; a surveillance system intended to detect conflicts on the runway. The NTSB is investigating why it did not alert the controller to the incursion.
Transponder
The firefighting truck lacked a transponder compatible with airport surface detection systems, which may have prevented the vehicle from being tracked accurately by automated safety alerts.
Interesting Facts
- 01The aircraft was a Bombardier CRJ900 (MHI RJ Aviation CL-600-2D24) registered as C-GNJZ.
- 02Both pilots, Captain Antoine Forest and First Officer Mackenzie Gunther, were fatally injured.
- 03There were two flight attendants on board; one was ejected from the aircraft upon impact but survived.
- 04The firefighting vehicle involved was an Oshkosh Striker 1500 designated as Rescue 35.
- 05The firefighting truck was not equipped with an ASDE-X transponder.
- 06A total of 39 people were transported to hospitals, with 6 sustaining serious injuries.
- 07The accident was the first fatal crash at LaGuardia Airport in 34 years.
Safety Actions & Advisories
FAA ARFF Transponder Mandate
Source ↗Following the collision, the FAA issued a safety alert recommending that all Part 139 airports accelerate the installation of ASDE-X/ASSC compatible transponders on all primary emergency response vehicles to ensure visibility on surface detection equipment.
Known Controversies & Unanswered Questions
ATC Admission of Error
Reference ↗Leaked air traffic control audio captured the controller stating 'I messed up' immediately following the collision. While a pilot from another aircraft (Frontier 4195) radioed back in support, the recorded admission has become a focal point of public and investigative scrutiny regarding the clearance given to the firefighting convoy.