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G5
Maintaining Your AirplaneTesting the Hardware After a USM Retrofit
A Cessna 172 takes its first flight after an avionics panel upgrade with used-serviceable material (USM).
Richard Scarbrough![](https://www.flyingmag.com/uploads/2024/04/after-1-cr-Elijah-Lisyany.jpg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
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