BOISE, Idaho (AP) — Authorities finished their second day of searching for a small plane that disappeared in the mountains of central Idaho. Crews on the ground along with helicopters and airplanes have been scanning the backcountry for a Beech Bonanza piloted by a California software executive.

Dale Smith, of San Jose, Calif., reported engine trouble Sunday before losing radio contact. He and four passengers were flying from Baker City, Ore., to Butte, Mont. Authorities identified the passengers as Smith's son Daniel Smith and his wife, Sheree Smith.

Also on board were Dale Smith's daughter, Amber Smith and her fiance Jonathon Norton. Officials narrowed the search Tuesday to an area south of a backcountry landing strip near the tiny town of Yellow Pine after receiving a faint signal from the plane's emergency beacon.