Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 4; Flight Crew Total 5135; Flight Crew Type 1092
Communication Breakdown
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
Aircraft X was holding short for Runway 7 at MBJ while [other airline flights] were on the approach. As Aircraft Y approached the runway (approximately 1 mile final); I heard a voice on the Tower frequency say cleared for takeoff" No callsign was given; and the voice did not match the Tower controller who had cleared us to hold short. We held our position. If we had taxied onto the runway; we would have created a collision threat with the aircraft on short final. We did not respond to the call or mention it to the controller because to do so in that moment would have created confusion on the busy frequency. Operations continued as normal with no additional threats. It is my belief that one of two things happened. Either a person with a transmitter outside the airport attempted to get us (Aircraft X) to taxi onto the runway in front of a landing aircraft; or someone in the Tower spoke too close to an open microphone while discussing a takeoff clearance. I do not think the second scenario is as likely; since the tone was not conversational; the voice sounded young; and no other words were spoken other than "cleared for takeoff"."
Air carrier First Officer reported ignoring a false ATC instruction heard; which would have resulted in a collision threat.