![](http://www.alamy.com/thumbs/6/BD9641AF-F238-42A9-9F6D-F62A9E13FD8B/2GKRXC0.jpg)
Engineers watch temperature readings during an A-10 Thunderbolt II engine test June 23, 2021, at Hill Air Force Base, Utah. The engineers were determining temperatures inside the auxiliary power unit bay.
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Photo credit: © Operation 2021 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -10, 419th, apu, engine, oo-alc, scms, test, thunderbolt