Heikki Kovalainen was 'happy to contribute' after taking in another practice session for Caterham on Friday in Abu Dhabi.

Kovalainen, left without a drive this year after being replaced in the team's line-up, took over Giedo van der Garde's CT03 for FP1, completing 22 laps in total, his best effort a 1 minute 47.670 seconds, which left him 0.070 seconds off Charles Pic in the sister car.

It was the Finn's sixth FP1 outing of the season, after also driving in Japan, Italy, Belgium, Spain and Bahrain.

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"Generally the car was a bit on the nose to start with. Under braking and turning in it was on a bit of a knife edge and the tyres started going off quite early so that contributed to the handling issue, but we made a few changes and by the third run of the day we'd made some good progress with the balance," he reported.

"It was pretty neutral by the end of the session but the tyres had completely gone by then so we weren't learning too much more, but overall a decent session and good to contribute again this weekend to help the team in Abu Dhabi."

Meanwhile, van der Garde ended the day as the quickest Caterham driver - 19th overall - and he was also ahead of both of the Marussias, thanks to a 1m 44.138s effort in FP2.

"I was back in the car for FP2 and it felt pretty good right from the first run. The rears were locking a bit too much and the car wasn't planted in the high speeds but overall it was okay," he said. "I did a couple of runs on the mediums to begin with, then onto the softs for the performance run and I have to say the car felt pretty generally stable. We did have a bit of rear locking under braking and I would have like a bit more front end, but we made a few changes for the run on the softs and it was feeling good - my quickest lap was okay but I know there's more to come for quali, especially if we can improve the front end.

"On the long run I stayed on the options. The front tyres were cooling a lot which created understeer, but by the end of the run they were starting to come back. The rears were very consistent throughout the run so that gives us some interesting strategy options for the race.

"I haven't tried the primes on a long run yet but Charles has so we'll see what his data says tonight and then we can progress tomorrow."