A foam stress test simulation shows if an aircraft hydraulic fluid sample is within limits to meet product specifications in the Aerospace Fuels Lab at Wright-Patterson Air Force Base, Ohio, Jan. 25, 2018. This particular sample is part of a continuous sampling program for the F-16 Fighting Falcon fleet. When the hydraulic sample does not meet the military specifications, the sample is replaced with a new product. ( Air Force photo by Michelle Gigante)

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Photo credit: © Military News / Alamy / Afripics
License: Licensed
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