![](http://www.alamy.com/thumbs/6/B62A6216-8A86-4AE2-A818-132BCD1DC105/2GKRXFA.jpg)
Stephan Hall, Honeywell test engineer, cleans inside the auxiliary power unit bay of an A-10 Thunderbolt II June 23, 2021, at Hill Air Force Base, Utah. The bay needed to be cleaned prior to placing 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