Kimi Raikkonen says Ferrari still doesn't understand why the front-wing failed on his car during first free practice for the Hungarian Grand Prix, as he lamented a day of niggling issues.

The Finnish driver ended FP1 third fastest despite causing a red flag in the closing stages when his front-wing collapsed on the exit of the turn 12 left-hander.

It is a failure that Ferrari is still investigating, but the 2007 F1 champion is confident the team will ensure it doesn't reoccur.

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"It just broke suddenly," he said. "It damaged the front wheel, the front tyre and rear tyre. I don't know what happened, it just came off. Obviously it's not ideal when the front wing breaks but we don't know the reason yet. At least I don't know, the team is looking in to it and hopefully we'll find the reason for it."

Reflecting on his general pace, Raikkonen - who was fifth fastest in FP2 and quicker than Sebastian Vettel throughout the day -, was not impressed by his lap times.

"It doesn't feel too bad but obviously lap times are still not great. We had some issues today so it would have been better if we had run without those. We missed some laps ... but it's a normal Friday really, we'll try and move forward from where we are and we'll see tomorrow how we do."