Jules Bianchi was quickest on the opening day of testing at Magny-Cours as the French circuit welcomed F1 machinery back for a three-team Young Driver Test.
Bianchi posted a best time of 1min 18.070secs from the first of two days of planned running with Ferrari, although the Frenchman did see his running come to a slightly early end when he stopped on track to bring out the red flags in the final half hour.
Bianchi was half a second clear of GP2 racer Luiz Razia who produced an impressive display on his day of running with Force India. The Brazilian, who suffered a spin at Imola that caused a brief stoppage earlier in the day, left it late to post his quickest time and he now hands the VJM05 over to Bianchi for Wednesday's second day.
Ferrari will run Davide Rigon on day two before Bianchi then returns on Thursday.
Sam Bird was the final driver on track at the start of a two-day programme with Mercedes, with the main focus for the Brackley-based team being a reprofiled exhaust system being tested ahead of the final races of the season.
The Briton was the busiest man on track with a total of 95 laps and is due to continue his development work tomorrow. Kiwi Brendon Hartley is than slated to run on Thursday if Bird's programme is completed.
Magny-Cours test times – Day 1, 11 September:
1. Jules Bianchi
1min 18.070secs 87 laps
2. Luiz Razia
Brazil Force India-Mercedes
1min 18.535secs 65 laps
3. Sam Bird
1min 19.094secs 95 laps
All times unofficial