National Airspace System

Onawa (K36) is in the bottom right quadrant of the sectional excerpt. It is outside of any shading or lines, which indicates the airport is in Class G airspace up to 1,200 feet AGL.

Within the outer magenta circle of Savannah Class C airspace, there is a number 41 directly above the number 13. These numbers depict the floor and ceiling of the Class C airspace; the floor being 1,300 feet MSL and the ceiling being 4,100 feet MSL.

The high-intensity towers 6 miles southwest of the Savannah/Hilton Head Airport have a maximum elevation of 1,545 feet MSL (1,532 feet AGL). The regulations allow for an sUAS to be operated 400 feet above the structures uppermost limit when within a 400-foot radius of the structure: 1,545 + 400 = 1,945 feet MSL.Answer (B) is incorrect because 1,945 feet indicates your maximum altitude in MSL. Answer (C) is incorrect because regulations permit you to operate 400 feet above the structures uppermost limit of 1,545 feet MSL.

The communications section of the Chart Supplement U.S. for Lincoln Airport lists 118.5 as the tower frequency and the common traffic advisory frequency (CTAF) when the tower is closed. When operating in the vicinity of an airport, remote pilots are encouraged to monitor the tower frequency or CTAF.

No person may operate an sUA in Class B, Class C, or Class D airspace or within the lateral boundaries of the surface area of Class E airspace designated for an airport unless that person has prior authorization from ATC.

An MOA contains military training activities such as aerobatics, and calls for extreme caution. Any FSS within 100 miles of the area will provide information concerning MOA hours of operation. Prior to entering an active MOA, pilots should contact the controlling agency for traffic advisories, noted in the legend for special use airspace.