Federal and airline officials this morning will resume their investigation at the hilly, wooded site where an Allegheny Airlines plane crash landed and burned near Farragut Friday.

Arnold E. Holstine, air safety investigator in charge of the three-man Civil Aeronautics Board team, said: “Until we have a chance to talk to the people involved, it will strictly be conjecture as to what caused the crash.”

Holstine said the overall investigation might continue for 30 days or six months.

As of today, 15 to 30 persons probing the wreckage are doing what Mr. Holstine called “documenting the crash.”

The charred, blackened, and scattered wreckage of the twin-engine Convair 440 lies on a wooded hillside near the Good Shepherd Church, about seven miles northeast of Montoursville.

The 36 passengers and 4 crew members were shaken up or injured but emerged alive.

“Every tree and every stone were in the right place for them,” said Lt. Lamar Bowman, a Civil Air Patrolman guarding the site. “If it wasn’t, we might have been picking up bodies today.”