Alternate Static Source

The pilot can select the internal static source if the outside source becomes clogged with ice.

Alternate static source. An alternate static source is provided in some aircraft to provide static pressure should the primary static source become blocked. It would appear that due to the venturi effect of the flow of air over the cockpit this alternate static pressure is usually lower than the pressure provided by the normal static source. Other instruments that might be connected are air data computers flight data recorders altitude encoders. Pneumatic toggle actuated valve for alternate static air source.

When you switch to your alternate static source the altimeter will read higher than normal. On later model aircraft an alternate static source is provided inside the cockpit. Alternate static source valve. Alternate static source faa written knowledge test preparation.

The static pressure port is normally found on the side of the fuselage. The alternate static source is normally found inside of the flight deck. For windows pcs mac iphone ipad android pocketpc and mp3 audio. So when the alternate static source is used the following differences in the instrument indications should occur.

Due to the venturi effect of the air flowing around the fuselage the air pressure inside the flight deck is lower than the exterior pressure. It is difficult to see due to its location but normally the valve handle feels like it points to the right. There are three kinds of figure 1. Heater on vents open and windows closed 3.

A pitot static system is a system of pressure sensitive instruments that is most often used in aviation to determine an aircraft s airspeed mach number altitude and altitude trend a pitot static system generally consists of a pitot tube a static port and the pitot static instruments. Up to date for and complete with all charts and figures and professional illustrated explanations. When you switch to your alternate static source because your primary failed in a non pressurized aircraft generally the alternate source is located in the cabin of the aircraft as opposed to on the fuselage. A valve in the instrument static air system that supplies reference air pressure to the altimeter airspeed indicator and vertical speed indicator if the normal static pickup should become clogged or iced over.

An alternate static source control valve is located below the instrument panel to the lower right of the left hand seat pilot s control wheel to the left of the gear lever. I found a airspeed calibration alternate static source figure in c172r poh. You will also need our p 515 fitting to connect to 1 4 tubing.