Sequence of Events
On 7 August 2020, an Aviat A-1 Husky, registration SP-AIR, was parked on the general aviation apron at EPMO. The pilot contacted EPMO Tower (TWR), which instructed the pilot to switch to the Delivery frequency to obtain weather information and a flight release. After receiving the weather and clearance from Delivery, the pilot was directed to re-contact TWR. Upon switching back to the TWR frequency, the pilot made several calls but could not hear the controller's responses. The TWR controller attempted to communicate using an alternate radio and the Delivery frequency, achieving brief contact that was then lost again.
Meanwhile, the Operations Duty Officer, while inspecting the maneuvering area, observed SP-AIR taxiing from the GA apron onto taxiway S. The officer radioed this information to TWR. Shortly after, the pilot established two-way communication with TWR. The controller informed the pilot about the multiple attempts to establish contact and noted that the pilot had started the engine and entered the taxiway without authorization. The pilot apologized, explaining that the audibility had been poor and that they believed they had received the necessary clearance. The subsequent taxi and takeoff were conducted normally.
Cause
The incident was caused by non-compliance with procedures, specifically starting the engine and occupying the runway without clearance.
Additional Information
The Polish State Commission on Aircraft Accident Investigation (PKBWL) accepted no recommendations or safety suggestions, as none were proposed by the investigating body. No contributing circumstances were identified.