BOISE, Idaho -

Search crews are back to work combing the central Idaho backcountry on ground and by air for a small plane that lost contact with air traffic controllers two days ago.

State and local search teams set out Monday to look for a single-engine Beech Bonanza near the tiny town of Yellow Pine, just outside the border of the Frank Church-River of No Return Wilderness.

The plane was carrying five family members and flying from Baker City, Ore., to Butte, Mont. The pilot reported engine trouble Sunday afternoon and requested coordinates for a backcountry air strip near Yellow Pine.

More than 20 searchers on all-terrain vehicles fanned out Monday and focused on a mountain ridge near the landing strip. But heavy snow and clouds hampered the search by air.