Airmen at Work: Minor iso ensures airworthiness Published June 3, 2016 By Staff Sgt. Rachel Kocin 910th Airlift Wing Public Affairs YOUNGSTOWN AIR RESERVE STATION, Ohio -- Tech. Sgt. Charles Wood, 910th Maintenance Squadron aircraft maintenance craftsman, conducts a phase one inspection on a C-130H Hercules aircraft here, May 14, 2016. His work was a part of a minor isochronal inspection, part of the scheduled preventative maintenance designed to keep the plane airworthy. (U.S. Air Force photo/Staff Sgt. Rachel Kocin)