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Minimum Safe Altitude (MSA) Standards
MSA is defined in the AIM as "altitudes depicted on approach charts
which provide at least 1,000 feet of obstacle clearance." So, if an MSA is 3000 ft, does that necesarily mean that there is at least one obstacle in the area that is 2000 ft tall or could there be some other reason for the 3000 ft setting? If there are only one or two towers in the north part of the MSA circle and the rest of the area is completely flat at 1000 ft (MSL), then would they always break the sector into pieces are create a sector at 2000 ft, and just put the northern half at 3000 ft, or is that too much trouble in general? While I am at it, is there any easy way to find the obstacle in a quad of VFR sectional that makes the quad's Maximum Elevation Feature (MEF) at the level that is at. It is a bit of a pain to search the quad's entire area to find that one tower that makes the MEF way above the surrounding terrain. It seems that they could mark the highest feature in some distinctive way. OK, so maybe I am lazy. -Sami (N2057M, Piper Turbo Arrow III) |
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