Large Transport; Low Wing; 2 Turbojet Eng
Ground Event / Encounter Object
Aircraft Aircraft Damaged
Airport; Human Factors; Weather
During an ongoing snow event; airport operations failed to maintain and or assess and properly NOTAM apron conditions. A Part 121 air carrier taxied onto the apron and skidded approximately 20 ft past its intended stopping point striking a GPU damaging the cowl and ingesting a chock that was sitting on top of the GPU. Pilot in command issued a PIREP of NIL braking on the apron to JAC ATCT. Airport authority immediately upgraded braking condition to POOR. Airport authority has no functioning certified friction measuring equipment to ascertain braking action on any surfaces. Airport authority reported contaminates as 1 inch dry snow over packed snow. Conditions were more than 1 inch dry snow over ice.
JAC Ramp Agent reported aircraft damage due to contact with a GPU during gate arrival when the flight crew could not stop due to snow and ice on the ramp. Conditions on the ramp were not NOTAM'ed.