US watchdog puts its foot down: Even a small possibility of interference means a fix is mandatory
During the couple of years that the C-band issue has been on the FAA's radar, the agency said it had received over 420 reports of radio altimeter anomalies occurring within known C-band deployment zones.
While most of the reports were attributable to other causes, the FAA said in around 100 of the incidents it"could not rule out 5G C-Band interference as the potential source of the radio altimeter anomalies." The FAA said the incidents all involved flight deck effects, like false terrain awareness traffic collision warnings, incorrect radio altimeter data and more.
The FAA admits those issues may seem"minor in isolation," but that they have serious implications over time, especially as C-band deployments near airports begin in earnest in the second half of 2023. The agency is concerned that repeated false warnings, which it believes"will occur more frequently as telecommunication companies continue to deploy 5G C-Band services," will desensitize flight crew to actual emergencies.The FAA estimates 7,993 aircraft will need to have flight manual revisions made, while 180 aircraft will require a total altimeter replacement. An additional 820 aircraft will need a C-band filter added.
While it didn't express frustration with the FAA's 2024 deadline, Airlines for America did appear to at least consider it a bit tight given supply chain concerns."Any government deadline must consider this reality," the trade group added. ®
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