Aircraft Systems Pitot Static & Vacuum Systems Cessna 172 (FREE
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Check Your Cessna's Alternate Static Port A new airworthiness directive from the FAA applies to certain Cessna 172, 175, 177, 180, 182, 185, 188, 206, 207, 208, 210, 303, 336, and 337 series airplanes. The AD requires operators to check the alternate static air source selector valve to assure that the alternate static air source selector valve port is not obstructed by a part number.. 172M drivers. Is there a "stock" alternate static source or was it optional. I could not find the thing during pre-flight Saturday and forgot to ask the FBO about it. The pedestal looks like the 172R and newer and I would think it would be there in the same location. But it isn't and I could.
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The ALT STATIC AIR valve provides static pressure from inside the cabin if the external static pressure source becomes blocked. If erroneous instrument readings are suspected due to water or ice in the pressure line going to the standard external static pressure source, the alternate static source valve should be pulled on.. This table is included because of the fact that the Alternate Static Port on 172s is inside the cabin. Thus, changes in cabin pressure (even really small ones) can have an impact on the static pressure that the system is using and hence on the indicated airspeed. The things the table mentions like windows and heat vents all influence the pressure in the cabin, and hence the airspeed. In.
