New Delhi

The Directorate General of Civil Aviation (DGCA) on Sunday announced that Indian airlines have completed software upgrades on 323 operational Airbus A320-family aircraft to resolve a potential flight-control data issue.

Airbus had earlier warned that intense solar radiation could corrupt critical flight-control data on a large number of A320-family jets, and that installing the required software fix could cause temporary operational disruptions.

Initially, 338 aircraft across IndiGo, Air India and Air India Express were identified for the upgrade. Of these, 323 were in service, six were undergoing base maintenance, and nine Air India aircraft were later found not to require any modifications, a senior DGCA official said.

IndiGo has upgraded all 200 of its operational A320-family planes.

Air India had 113 affected aircraft; software fixes have been completed on 100 operational jets, while four are under base maintenance and nine did not need modifications.

Air India Express has completed upgrades on 23 aircraft, with two more undergoing maintenance ahead of redelivery.

On Saturday, the DGCA issued an Airworthiness Directive instructing airlines to implement the software updates immediately. The move followed a global alert from Airbus and an Emergency Airworthiness Directive from the European Aviation Safety Agency (EASA).

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EASA noted that Airbus directed operators to install a serviceable Elevator Aileron Computer (ELAC), which manages key flight-control functions, on all affected aircraft.