Air Force Staff Sgt. Donovan Walters, 18th Component Maintenance Squadron aerospace propulsion craftsman, checks a valve on a F100/220 engine March 10, 2017, at Kadena Air Base, Japan. Certain parts of an engine require replacement once they reach a certain number of flight hours. Once those components are replaced, the entire unit undergoes testing to ensure the new parts function properly. ( Air Force photo by Airman 1st Class Quay Drawdy)

---

Size: 6016px × 4016px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: maintenance