Which key A380 wing component has developed cracks?

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The cracks were found in the wing-spar structure, a structural beam running along the wing.

The affected A380 component is the wing-spar structure, described as a structural beam that runs along the wing and carries much of the aerodynamic load during flight. Cracks were found on aircraft used by Emirates and Qantas, prompting urgent inspections ordered by the European Union Aviation Safety Agency.
The damage was detected during routine maintenance checks.
Inspectors found the cracks during routine maintenance checks, not after a flight incident. The issue was serious enough for EASA to order airlines to examine the wing-spar structure on affected jets.
Airbus will inspect 16 aircraft, including five immediately.
Airbus said it would inspect 16 A380 planes, with 15 operated by Emirates and one by Qantas. Five Emirates aircraft were due to be inspected immediately, starting as soon as Wednesday.
The affected aircraft share the same production history.
Airbus said all A380s with the same production history had been identified. The company said it would discuss with EASA whether repairs are necessary.
The A380 has faced wing-related checks before.
The A380 was also subject to EASA inspections in 2012 after cracks were found in brackets linking the wing skin to internal ribs. That earlier issue affected the global A380 fleet and led to a repair programme with later design changes.

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Which key A380 wing component has developed cracks?

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