Formula 1 newcomers Haas will fly in a new front wing solution after Romain Grosjean suffered a failure on the first day of testing at the Circuit de Barcelona-Catalunya.
Grosjean completed Haas' first laps on Monday but caused the only red flag of the day when his front wing failed along the pit straight.
The Frenchman was able to return to the circuit mid-afternoon and conduct short stints, to avoid stressing the front wing, and placed 10th with 31 laps completed.
"We had a good start to the day and then we had a problem with the front wing," said team boss Guenther Steiner.
"Obviously, we had to stop and evaluate the problem and find a solution. We found an interim solution, but we will have to find a solution by tomorrow morning.
"We got out running again and got a lot of data. It would have been nice to run more, but we still got some laps under our belt and we look forward to tomorrow."
Grosjean, who has switched from Lotus, was upbeat over Haas' progress.
"The morning went very well until we had a small front wing failure," he said.
"It compromised our afternoon a little, but it was good that we could put some laps on the car later. We don’t have any big problems. I’m very happy with the first day.
"It’s been a really good start for the team. It’s been a positive day. Of course, you always want more and more, but I think the most important thing is that I’m happy with the car.
"The first impression is really good. The car balance is there straight away."