![](http://www.alamy.com/thumbs/6/C90D35FE-B475-4108-886B-F880662A9422/2GKRXCX.jpg)
Stephan Hall, Honeywell test engineer, inside the auxiliary power unit bay of an A-10 Thunderbolt II June 23, 2021, at Hill Air Force Base, Utah. Hall placed thermalcouplers to determine temperatures inside the bay during a ground test.
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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