Question

A visual observer notices a manned aircraft approaching the area in which sUAS operations are taking place, flying just north of the area from west to east. What call could the remote PIC / visual observer make on CTAF to alert the manned pilot?

1) Zephyrhills traffic, unmanned aircraft Xray Yankee Zulu, operating five NM south of the airport at or below 400 AGL, located at the three o'clock position of the Cessna just north of our position, Zephyrhills traffic
2) Zephyrhills traffic, unmanned aircraft at three o'clock of manned aircraft in the area, Zyphyrhills traffic
3) Zephyrhhills traffic, unmanned aircraft Xray Yankee Zulu to Cessna in the area, look for us at your three o'clock position, we are about a mile south

Answer 1

The correct radio call on CTAF to alert a manned pilot of sUAS presence is a detailed message specifying the sUAS's call sign, location, altitude, and relative position to the manned aircraft.

Step-by-step explanation:

The question relates to aviation communication and the appropriate radio call to make on a Common Traffic Advisory Frequency (CTAF) to alert a manned aircraft pilot of the presence of a small Unmanned Aircraft System (sUAS) operating nearby.

The correct call the remote Pilot in Command (PIC) or visual observer should make is: Zephyrhills traffic, unmanned aircraft Xray Yankee Zulu, operating five NM south of the airport at or below 400 AGL, located at the three o'clock position of the Cessna just north of our position, Zephyrhills traffic. This call specifies the sUAS's call sign, its location with respect to a known point (the airport), its altitude, and its position relative to the Cessna, providing maximal situational awareness to the manned aircraft pilot.