National Airspace System

Obstruction altitudes are identified on sectionals along victor airways with blue numbers (elevation of the top above MSL) and another number in parentheses below (height AGL). The lowest object altitude along V15 is 2264 MSL, 300 AGL.

Card Airport (located south of Figure 24, area 6) is a Private airport, indicated by "PVT" after the airport name and the circled "R." This airport is depicted in magenta, which means it is non-towered.

When a manned aircraft is approaching to land at an airport in Class G airspace without an operating control tower, each pilot of an airplane will make all turns to the left unless the airport displays approved light signals or visual markings indicating that turns should be made to the right (which will be detailed in the Chart Supplement U.S. Answer (A) is incorrect because the traffic pattern altitude will vary for each airport and aircraft; however, all turns should be to the left unless otherwise indicated. Answer (C) is incorrect because the traffic pattern altitude will vary for each airport and aircraft; however, all turns should be to the left unless otherwise indicated.

Effective scanning is accomplished with a series of short, regularly spaced eye movements that bring successive areas of the sky into the central visual field. Each movement should not exceed 10 degrees, and each area should be observed for at least one second to enable detection.

On-airport areas that are used for certain cargo functions, including screening, must be a SIDA. A SIDA is that portion of an airport within the United States, specified in the security program, in which individuals must display an airport-issued or approved ID and carry out other security measures.

IR678 identifies an MTR in a south-easterly direction depicted by the solid gray line and directional arrow. The IR represents an IFR route, while the three following digits indicate flights along this route are conducted above 1,500 feet AGL. Flights which are conducted at or below 1,500 feet AGL are identified by a four-digit number, while VFR flights are indicated by a VR in place of the IR.