Vertical Speed Indicators (VSIs) cover the design and manufacture of pneumatic and solid-state instruments that measure rate of change of barometric altitude, encompassing calibrated leak capsule assemblies, metering units, and IVSI (Instantaneous Vertical Speed Indicator) accelerometer-augmented mechanisms, together with MEMS-based pressure transducers, signal conditioning electronics, and DO-178C/DO-254-compliant embedded processing for digital variants.
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