A remote PIC notices that the drone's telemetry shows battery voltage dropping faster than expected at 50% charge. What is the most appropriate response?
Why →
Abnormal battery discharge rate is a warning sign of a degraded or failing cell. Continuing the mission risks an in-flight power failure with no warning. A significantly greater hazard than ending the flight early. The appropriate response under the ADM (aeronautical decision-making) framework is to detect the anomaly, estimate the risk, choose the safest option (return and land), and evaluate. "Use remaining battery efficiently" inverts the risk calculus.The trap →
Reducing throttle (Choice C) might extend remaining flight time but does not address the root cause: an anomalous discharge rate suggests cell degradation, swelling, or internal shorts that can cause rapid failure without further warning. Using remaining battery efficiently (Choice A) maximizes risk exposure time.SOURCE → 14 CFR § 107.19, FAA Remote Pilot Study Guide, ADMCHECKED APR 21ACS V.C.K1MED