A remote pilot is hired to photograph damage near the top of a 700-ft radio tower. What is the highest altitude the small unmanned aircraft may legally reach during this inspection?
- A700 ft AGL, matching the exact height of the tower
- B1,100 ft AGL, as long as the aircraft stays within a 400-ft radius of the towerĐúng
- C800 ft AGL, which is twice the standard 400-ft limit
- D400 ft AGL, because the 400-ft ceiling has no exceptions
Vì sao: Correct answer: 1,100 ft AGL. Under §107.51 the aircraft may fly higher than 400 ft AGL if it remains within a 400-ft radius of a structure and does not climb more than 400 ft above that structure's uppermost limit, so 700 + 400 = 1,100 ft. The 400-ft-only answer ignores the structure exception, and the 700-ft and 800-ft answers apply the wrong math to the rule.14 CFR §107.51
