A small plane crashed and slammed into a sign near a northwest Harris county airport Thursday. The two-engine plane crashed near a runway at the west Houston airport on Groeschke road at Barker Cypress shortly before 11 a.m. central time. Officials said the pilot was trying to take off, but could not get the aircraft off the ground. it ran off the runway, across a street and crashed into a left-turn road sign.The pilot and passenger were not injured. The cause is under investigation.