An unstable big screen has caused Practice 1 for the Portland IndyCar event to be red-flagged.

The screen adjacent to the main straight started to lean during the opening runs of the 75-minute session, with a halt coming in the 24th minute.

Reportedly, the root cause of the problem is a hydraulic issue with the screen.

Keepin’ it weird in Portland. With a weird red flag…

Practice 1 has been stopped because of issues with the big screen board near the front stretch.#INDYCAR // #PortlandGP pic.twitter.com/nG3IctFPk1

— NTT INDYCAR SERIES (@IndyCar) September 2, 2022

At the time of the red flag, Juncos Hollinger Racing’s Callum Ilott was the pace-setter on a 0:59.6811s, although it is mostly rookies which have been running given their more generous tyre allocation.

The session is yet to restart, although the clock is currently stopped.

Earlier, IndyCar confirmed a grid penalty for the #2 Team Penske entry of title contender Josef Newgarden for an unapproved engine change.

Update 08:59 AEST

Work is ongoing on the big screen, over an hour after the red flag period began.

Update 09:10 AEST

Drivers getting back into their cars.

Update 09:16 AEST

Big screen has been stabilised with cables.

Update 09:17 AEST

Green flag, just over 80 minutes after the red flag period began. There will be 51:38 to so in the session.