India sets 2027 5G aviation deadline

A plane’s radio altimeter is the instrument that tells pilots exactly how high the aircraft is above the ground in the last seconds before landing, and India has now told airlines they must make those systems tolerate local 5G signals by 31 December 2027. The order also says aircraft that are not upgraded will face landing-system limits in Indian airspace. (aim-india.aai.aero) (infra.economictimes.indiatimes.com) This is not about phones on board. It is about 5G base stations on the ground using India’s 3,300 to 3,670 megahertz C-band, which sits below the 4.2 to 4.4 gigahertz band used by radio altimeters. (communicationstoday.co.in) (icao.int) A radio altimeter works like a stopwatch for radio waves: it sends a signal to the ground, waits for the echo, and turns that tiny delay into height. Aircraft use that height data for automatic landing, low-visibility approaches, and some head-up display and enhanced vision functions near the runway. (icao.int) (aim-india.aai.aero) India’s regulator says the danger is not a total failure but a bad reading that neither the pilots nor the automation catch in time. Its order warns that an undetected anomaly close to the ground could lead to loss of continued safe flight and landing. (aim-india.aai.aero) Until fleets are fixed, India is using the same kind of stopgap other countries used first: change the telecom rollout around airports. In August 2025, the Department of Telecommunications ordered exclusion zones around airports and said the revised limits would stay in place until radio altimeters are upgraded or retrofitted. (timesofindia.indiatimes.com) The restrictions are concrete. For aircraft that are not 5G-tolerant, India’s order prohibits certain Instrument Landing System approaches, automatic landing operations, manual flight-control guidance to touchdown, and use of enhanced flight vision systems to touchdown. (aim-india.aai.aero) This fight has been global for four years because 5G loves the 3.5 gigahertz neighborhood. The mobile industry says more than 90 countries now run live 5G networks somewhere in the 3.3 to 4.2 gigahertz range, and more than 60 percent of launches have used the 3.5 gigahertz band. (gsma.com) India’s government said as early as 2023 that it could not run its own design study because India is not the state of design or manufacture for most aircraft and onboard equipment it operates. Instead, the Directorate General of Civil Aviation said it reviewed studies and actions taken by other countries and adopted buffer zones, power limits, and antenna-tilt rules around airports. (sansad.in) So the 2027 date is really a handoff point between two industries. Telecom operators get to keep building out C-band 5G, but airlines now have a hard deadline to swap or modify hardware so airport safety no longer depends on special no-power and low-power zones. (timesofindia.indiatimes.com) (communicationstoday.co.in) That is why a spectrum decision made for mobile internet ends up changing aircraft manuals, landing permissions, airport antenna maps, and airline maintenance schedules years later. A few hundred megahertz on a regulator’s chart can turn into a multiyear engineering project across every jet that wants to land in poor visibility. (icao.int) (aim-india.aai.aero)