New Delhi (PTI): IndiGo, Air India and Air India Express flight operations will see disruptions as they work on fixing a potential issue related to flight controls in their A320 family planes and 200-250 aircraft will be impacted in the country, according to sources.

Airbus on Friday said intense solar radiation might corrupt data critical to flight controls in a significant number of A320 family aircraft and that the software changes required to fix the issue would lead to operational disruptions.

With many of the narrow-body A320 family planes of the domestic carriers set to undergo software changes or in some cases hardware realignment, there will be operational disruptions as the aircraft have to be grounded, the sources said.

Indian operators have about 560 A320 family aircraft and 200-250 of them will need software changes or hardware realignment, they added.

The European Union Aviation Safety Agency (EASA) said Airbus asked airline operators to install a serviceable Elevator Aileron Computer (ELAC) in the impacted aircraft.

Generally, ELAC is for flight controls.

EASA has directed that the issue should be addressed before the next flight to be operated by the impacted aircraft by replacing or modifying the affected ELAC.

On Saturday, the country's largest airline IndiGo said it is aware of a notification issued by Airbus, the manufacturer of the majority of our fleet, pertaining to the A320 family planes.

"We are working closely with Airbus to ensure implementation as per Airbus notification. While we carry out the necessary inspections, we are making every effort to minimise disruptions," it said in a statement.

In a statement Air India Express said, "We have initiated immediate precautionary action in response to an alert requiring a software fix on the Airbus A320 fleet. While a majority of our aircraft are not impacted, the guidance applies to operators worldwide and may result in adjustments to flight operations, including potential delays or cancellations."

A source said that 31 A320 family planes of Air India Express will be impacted.

In a post on X, Air India said it is aware of an Airbus directive related to its A320 family aircraft currently in-service across airline operators.

"This will result in a software/hardware realignment on a part of our fleet, leading to longer turnaround time and delays to our scheduled operations.

"Air India regrets any inconvenience this may cause to passengers till the reset is carried out across the fleet," the airline said.

The three airlines did not disclose the number of aircraft that have been impacted.

A320 family aircraft includes A319s, A320 ceos and neos, A321 ceos and neos.

In an Emergency Airworthiness Directive, EASA said Airbus has asked airline operators to install a serviceable ELAC in the impacted aircraft.

Airbus said an analysis of a recent event involving an A320 family aircraft has revealed that intense solar radiation may corrupt data critical to the functioning of flight controls.

"Airbus has consequently identified a significant number of A320 family aircraft currently in-service which may be impacted," it said in a release.

Airbus said it acknowledges these recommendations will lead to operational disruptions to passengers and customers. "We apologise for the inconvenience caused and will work closely with operators, while keeping safety as our number one and overriding priority."

The aircraft maker said it has worked proactively with the aviation authorities to request immediate precautionary action from operators via an Alert Operators Transmission (AOT) in order to implement the available software and/or hardware protection, and ensure the fleet is safe to fly.

According to the EASA, an Airbus A320 aeroplane recently experienced an uncommanded and limited pitch down event.

"The autopilot remained engaged throughout the event, with a brief and limited loss of altitude, and the rest of the flight was uneventful.

"Preliminary technical assessment done by Airbus identified a malfunction of the affected ELAC as possible contributing factor," it said.

This condition, if not corrected, could lead in the worst-case scenario to an uncommanded elevator movement that may result in exceeding the aircraft's structural capability, the EASA said.

It added that to address the potential unsafe condition, a serviceable ELAC has to be installed in the impacted planes.

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Chennai (PTI): For Kate, the dream was simple -- to watch her son Fahy Noah play for the Australian team in the Junior Hockey World Cup here and visit the Taj Mahal.

But her plans, like those of many others, have been upended by the operational crisis that has hit IndiGo, India's largest domestic airline.

"I am here for the first time and India is so kind and welcoming. We were hoping to see the Taj Mahal, but with the IndiGo problems, we are a bit scared now," Kate, who has come from Brisbane, told PTI outside the Mayor Radhakrishnan Hockey Stadium here.

"One family went on a rest day and got stuck overnight. I think we will have to cancel all our travel plans now, though seeing the Taj Mahal was on my bucket list for long," she said.

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This is the first time that 24 teams are participating in the Junior Hockey World Cup, being held in Chennai and Madurai from November 28 to December 10. For most players and their families, it is their maiden trip to India. Many NRIs have also flown in to support the Indian team.

However, the widespread flight delays and cancellations have thrown schedules into chaos. IndiGo cancelled thousands of flights last week, citing regulatory changes in the pilots' flight duty and regulations norms. This resulted in lakhs of passengers getting stuck at airports across the country.

Laura, who has come from Belgium with her entire family to support her son, said they are now travelling by road.

"We are happy to be here in this beautiful country. We went to Munnar and Madurai, and now we are planning to go to Puducherry and Mahabalipuram by road," she said.

"We had taken IndiGo flights earlier, but some other families who travelled on different days got stuck and somehow managed to come back by train. So we are not flying anywhere in India now. Road travel only and then back to Brussels next week," she said.

For 87-year-old Kenyan hockey legend Avtar Singh Sohal, a four-time Olympian and a lifelong supporter of Indian hockey, the crisis was particularly distressing. He spent 12 gruelling hours at the Chandigarh airport on December 4 before finally reaching Chennai just in time for the quarterfinals.

"Our IndiGo flight was delayed by 12 hours. We were at the airport from 7 am to 7 pm. They kept giving excuses -- the aircraft has not arrived, the pilot is not available. We had no idea what was actually happening," he said.

Accompanying Sohal was 85-year-old Tarlok Singh Mandair, a former treasurer of the English Hockey Association, who had flown in from London.

"It was a horrible experience. They kept changing the timings from 12 noon to 4 pm and we finally took off at 7:20 pm. They gave us sandwiches which were not even good," Mandair recalled.

"Our return flight is also on IndiGo, but now we are exploring other options," he said.

Jujhar Singh Plaha, 86, from London, who was on the same flight, said his excitement has turned into anxiety.

"We were so excited about this trip; hockey is our first love. But this (IndiGo crisis) spoiled our mood. Now we are worried about returning because at our age, we cannot travel long distances by train or road," he said.

Jason, the father of Australian player Roger Lachlan, has had an eventful trip to India so far -- beginning with the rain in Chennai triggered by Cyclone Ditwah.

"We are from Hobart -- home of Ricky Ponting and David Boon. We arrived after a cyclone, which caused heavy rain. Now the sun is out and we are enjoying ourselves," he said with a smile.

Jason, too, has shelved all further travel plans.

"No sightseeing now. We will just eat, swim and head back. I am loving masala dosa, masala tea and curries," he said.

Some fans from Bengaluru, who had booked their flight tickets months in advance, decided not to take a risk. They opted for refunds and drove down to Chennai on Sunday to catch the semifinal.

"With flight uncertainty and trains full, we drove down. We did not want to miss India in the semis," said Vinod Chinnappa, who drove for six hours to come here.

Even officials have not been spared by the flight disruptions.

Digvijay Singh, an official of the Hockey India League franchise, waited eight hours at the Patna airport to catch a flight to Chennai.

"I did not want to miss the India-Belgium quarterfinal, so I waited. I finished all episodes of (web series) Family Man at the lounge," he said.

"I had gone to Patna from Delhi for a meeting earlier in the day and then needed to connect to Chennai," Singh said.

With the World Cup set to wrap up in two days, uncertainty about people's plans to return home looms large.

With prices of alternative flights rising and train seats nearly impossible to find, fans, officials, families and journalists are monitoring travel apps as closely as match updates.

If the situation does not improve soon, returning home could be as challenging as winning matches on the field.