![](http://www.alamy.com/thumbs/6/D784E4E0-081A-4382-99A5-D5B7F5AABC4C/2GKRXE1.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