The method of mounting aircraft instruments in their panels depends on which design aspect?

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The way aircraft instruments are mounted in panels is dictated by the instrument’s own case design. The case includes the mounting features—such as studs, flanges, or a rim—that align with the panel cutout and determine how the instrument is secured, aligned, and supported. The panel must accommodate the exact dimensions, mounting hardware, and any backside connections or vibration isolation built into the instrument’s case. Because of this, the mounting method is driven by the instrument case design itself, not by panel material, wing configuration, or pilot preference.