Large Transport
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 171
Communication Breakdown
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Flight Crew Became Reoriented
Human Factors; Weather
We were instructed to cross Runway 25R on Taxiway P and turn left onto parallel Taxiway B. While I was reading back instructions to Ground Control; Captain turned left onto Runway 25R. I tried to motion him to stop the turn and continue straight across on P; but by time he realized his mistake we were too far into the turn. We continued down the runway to the next intersection (Taxiway T) and exited there.I should have stopped my communications with Ground Control to verbally alert the Captain. He would have most likely responded more quickly to my verbal communication than he did to my gestures.
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Air carrier flight crew reported being cleared to cross Runway 25R at LAX; but made an incorrect turn and ended up on the runway. They exited at the next intersection.