Radio Telephony and Communication Procedures
Even when a drone flight stays outside controlled airspace, the exam expects standard ICAO radiotelephony: correct phraseology, correct readback, and correct distress procedure.
Standard practice
Use the phonetic alphabet and say numerals digit by digit for headings, frequencies and altitudes. Identify yourself with the operator callsign, then the aircraft type, then position and intention. The four essentials of any position report are identification, position, altitude or level, and intention.
Words that matter
Roger means received; wilco means will comply; standby means wait, I will call you; say again requests repetition; unable refuses a clearance; affirm and negative replace yes and no. A clearance - altitude, routing, frequency, hold point - must be read back in full. Never say "over and out".
Emergencies
MAYDAY three times for distress; PAN-PAN three times for urgency. Guard frequency is 121.5 MHz. An unmanned aircraft that loses its command link squawks 7400, distinct from 7500, 7600 and 7700. Where a flight information service is available, Manila Radio provides it.
Worked example
Clearance: "Cleared to operate within the control zone, not above 300 ft AGL, remain 2 NM clear of the extended centreline." Correct readback repeats all three constraints: callsign, the altitude limit, the lateral restriction. Reasoning: an incomplete readback that omits the 2 NM restriction leaves the controller believing you accepted a term you may not have heard.
Traps
Using "roger" as acceptance of a clearance; partial readbacks; saying "take-off" instead of "departure" in controlled airspace; failing to state AGL or AMSL when reporting altitude.