A small UA's lithium battery catches fire in flight. The remote pilot in command must climb above 400 feet AGL to reach a safe landing area, which exceeds a normal part 107 operating limitation. Under § 107.21, this is permitted because —

Why: 14 CFR § 107.21 and the remote pilot study guide's emergency procedures chapter confirm that a remote PIC facing an in-flight emergency, such as a battery fire, may deviate from any part 107 rule to the extent required to respond safely — here, climbing above the 400-foot AGL limit to reach a safe landing area.

• Invents a battery-fire-specific exemption; the actual rule is the general emergency deviation authority in § 107.21, not a carve-out tied to one hazard type.
• Invents a prior-approval requirement; § 107.21 deviation authority applies during the emergency itself, with reporting (if any) handled only upon later request by the Administrator.