You are inspecting a 300-foot tower. Under 107.51, how high may the unmanned aircraft fly while it remains within 400 feet of the tower?

• A.400 feet AGL, the same as anywhere else
• B.Up to 700 feet AGL, which is 400 feet above the tower's top
• C.Up to 300 feet AGL, capped at the tower's height

Why

Section 107.51(b) allows flight up to 400 feet above a structure's uppermost limit when the aircraft stays within 400 feet of that structure, so a 300-foot tower permits flight up to 700 feet AGL nearby. Leaving that 400-foot bubble means the plain 400-foot AGL cap applies again.

Source: 14 CFR 107.51 · ACS knowledge area: Applicable Regulations · From the Regulations & Registration practice bank (REG-092).

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