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Understanding pressure altitude and GPS altitude in aviation apps

iPad Pilot News

Airspeed and altitude differences Consider speed first. The panel in your airplane shows indicated airspeed (IAS, derived from the pitot tube on the wing), while the iPad shows groundspeed (derived from the GPS in your ADS-B receiver or iPad). Here’s a somewhat geeky dive into the details.

Altimeter 111
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Quiz: Understanding the airplane Pitot-Static System

Flight Training Central

Which instrument will become inoperative if the pitot tube becomes clogged? The pitot system provides impact pressure for which instrument(s)? Airspeed indicator. Vertical-speed and airspeed indicators. Vertical-speed indicator, airspeed indicator, and altimeter. Vertical speed.

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The Classic Boeing Airspeed Indicator

AeroSavvy

Location of the Honeywell SI-800 airspeed indicator on a 757/767 panel Inputs All airspeed indicators need two air inputs. Ram air from a pitot tube and static (undisturbed) outside air from a static port, usually a hole on the side of the fuselage.

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Exploring the Intricacies of the Airspeed Indicator

Pilot's Life Blog

In short, an airspeed indicator measures the ram pressure and compares it to static pressure to determine how fast a plane is moving. Moving air from outside feeds into the pitot tubes and fills a pressure diaphragm. True airspeed (TAS) is the difference between the indicated airspeed and actual speed.