Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Workload; Communication Breakdown; Confusion; Time Pressure
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert
Human Factors; Procedure
Out of TUPJ; we called for taxi and clearance. Common to get it all at once at this airport. The controller gave us Taxiway D to the active runway and immediately spit out the clearance at a fast speed. We held position as my partner tried several more times to understand the clearance. The Controller seemed to get irritated as we tried to figure out his instructions. The island accent and pace of his instructions were making it difficult. We finally got it in the box as he instructed us to expedite the back taxi for he had two aircraft inbound. We did so and then took off. After takeoff he told us to contact departure and to 'next time wait for takeoff clearance.' No further communication took place as we switched to departure. We both believe he gave us takeoff clearance. Slower communication from ATC. It is very difficult to understand the accent. Patience from ATC. If he felt rushed; he should have stopped us from continuing onto the runway.
A Captain reported TUPJ ATC was very difficult to understand but with effort the clearance and taxi instructions were completed. After back taxiing on the runway he took off without clearance because he misunderstood the Controller.