Airport transponder gaps reveal risks

The Federal Aviation Administration is moving to equip its airport vehicles with transponders after a March 22 runway collision at New York’s LaGuardia Airport exposed gaps in how ground traffic is tracked. The crash involved Air Canada Express Flight 8646, a Jazz Aviation CRJ-900, and Rescue 35, an airport firefighting truck, according to the National Transportation Safety Board. The two pilots were killed, and 39 people were taken to hospitals. (independent.co.uk) The episode has drawn renewed attention to a long-running issue: some airport vehicles still do not transmit their position to the surface-surveillance systems controllers use to spot conflicts. (ntsb.gov) ### Why do transponders matter on the airfield? The FAA says its Airport Surface Detection Equipment, known as ASDE-X, uses radar, multilateration and satellite-based data to track aircraft and vehicles on runways and taxiways. The system can track both transponder-equipped and non-equipped traffic, but it also uses transponder data to identify vehicles and aircraft and to improve controllers’ situational awareness. The FAA says ASDE-X includes visual and aural alarms for possible runway incursions. John Cox, a retired airline captain and safety consultant, told The Independent that the missing-equipment issue is “an existing gap, and it needs to be closed.” The newspaper reported that the FAA has urged airports since 2011 to adopt vehicle transponders but had not made them mandatory. (ntsb.gov) ### What did investigators say happened at LaGuardia? The NTSB says the collision occurred at 11:37 p.m. EDT on March 22 as the CRJ-900 was landing on Runway 4 at LaGuardia. The aircraft was substantially damaged after striking the Oshkosh Striker 1500 rescue vehicle. (faa.gov) The flight was operating from Montréal–Trudeau International Airport to New York. ABC News, citing the NTSB’s preliminary report, said the truck’s turret operator recalled hearing a controller say “stop stop stop” seconds before the crash, but did not know who the transmission was meant for at first. The same report said runway warning lights designed to alert ground vehicles were functioning that night, though investigators did not say why the truck did not stop. (independent.co.uk) ABC also reported that one controller was handling two jobs while another was coordinating a separate emergency. ### What has the FAA done since the crash? (ntsb.gov) The FAA said on May 13 it will spend $16.5 million to install transponders on its airport vehicles after the LaGuardia collision. Reuters reported that the fire truck involved in the crash did not have a transponder transmitting its location to air traffic control. The FAA said the funding will equip its vehicles with transponders and encouraged airports and airlines to follow suit. In its statement, the agency said airports and airlines can use federal grant money for the equipment. (abcnews.com) ### Is this only about one crash? The Independent reported on May 19 that recent crashes and near misses at U.S. airports have intensified concern about runway incursions and ground-vehicle visibility. The report said aviation experts continue to describe flying as statistically safe, but identified vehicle tracking on the airfield as a specific vulnerability. (usnews.com) The NTSB’s LaGuardia investigation page says the case remains preliminary and subject to change. The FAA’s transponder rollout is now one of the clearest near-term steps tied directly to that investigation, while the agency has also urged airports and airlines to add the same equipment to their own vehicles. (faa.gov) (ntsb.gov) (independent.co.uk)