Williams endured a tough start to the Jerez F1 test after mechanical issues limited Pastor Maldonado to just a handful of laps in the new FW33.
The Venezuelan spent much of the day watching from the sidelines due to an issue with the rear wing actuator on his car before finally managing to hit the track in the final half an hour of running.
However, Maldonado wasn't able to chase a time as he simply worked through aero testing and system checks and was more than 14 seconds off the quickest time as a result.
“It has not been a productive day for us I'm afraid,” technical director Sam Michael said. “After the installation lap we had a problem with a bleed screw for the rear wing hydraulic actuator. It is straightforward to correct, however during the day it caused a lot of downtime as we shuffled parts around to get the car out on the track.
“On the positive side, in the late afternoon we did complete all the aero testing that required the front tyre rake, so that will come off tonight.”
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