The static line is the hollow tube that connects the static pressure port to the case and diaphragm of the vertical speed indicator. The case is the housing that contains the other components of the vertical speed indicator.
The case is connected to the static line via a connection with a calibrated leak. The calibrated leak is a special type of connection between the case and the static line that prevents the pressure inside the case from changing immediately when air flows into the case. The diaphragm is a flexible metal container located inside the case and attached directly to the static line.
The face is the front part of the vertical speed indicator which is visible in the cockpit and which the pilot looks at to get a vertical speed reading. The needle on the face of the VSI is connected to the diaphragm via gears and rods. How does a vertical speed indicator work?
A vertical speed indicator works using the pitot-static system. External air is collected through the static pressure ports and flows through the static line into the case and diaphragm. The air flows into the case through the port with the calibrated leak while the diaphragm receives air directly from the static line. When the aircraft climbs, the static pressure outside the aircraft decreases.
This lower pressure air flows through the static line and the pressure in the diaphragm decreases. Two typical VSI indications are depicted below. The first is a conventional indication while on the second instrument, the vertical speed is indicated on the scale at the extreme right of the instrument.
In a simple VSI, a barometric capsule is contained in a sealed case. If you would like to learn more about other flights instruments in addition to IVSIs, visit our resource center. Our knowledgeable staff will be happy to help find the right instrument for you. Start Faster. Start Smarter. Sign up today Want the latest news, product updates and promotions?
September 3, Vertical speed indicators VSI measure the change in static pressure due to a change in altitude and present this information as the rate of climb or descent. You can reach him at aleks boldmethod. To: Separate email addresses with commas. Now What? All Videos. Planes Careers. Aleks Udris Aleks is a Boldmethod co-founder and technical director. Recommended Stories. How A Jet Engine Starts. It comes down to lots of air under pressure, some fuel, and boom, you're lit. Most IFR flights end with a visual approach - which seems kind of funny, considering the majority of your IFR training centers around shooting instrument approaches.
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