ACR MLG INGESTS PART OF THE GND AIR CONDITIONING HOSE BEFORE ENG SHUTDOWN.

Narrative

WE HAD JUST SET THE BRAKE PARKED AT THE GATE WHEN WE FELT A STRONG CONTINUOUS VIBRATION (#2 ENG ALREADY SHUTDOWN). WE THOUGHT IT WAS THE JETWAY HITTING THE ACFT. WE WERE AWAITING THE GND CREW TO CONNECT ELECTRICAL PWR AND THE CAPT MENTIONED HE SMELLED SMOKE WHEN THE VIBRATION STARTED AGAIN. THE GND CREW SIGNALED THE CAPT (WHICH I COULDN'T SEE) TO SHUTDOWN #1 ENG. THE CAPT DIRECTED ME OFF THE FLT DECK TO SEE WHAT WAS HAPPENING (FORWARD DOOR; 1L WAS OPEN). I CAME BACK ON DECK AS THE FIRST PAX WERE DEPLANING AND TOLD HIM WE HAD INGESTED LARGE AMOUNTS OF AIR HOSE INTO THE #1 ENG. THE CAPT HAD ALREADY SHUT THE ENG DOWN (AS INDICATED ABOVE) AS WAS ACCOMPLISHING THE PARKING AND SECURING CHKLIST. THE CAPT ALSO NOTIFIED GND OF OUR PROBLEM; REQUESTING FIRE EQUIP AND DIRECTED THE PAX OFF THE ACFT QUICKLY. I ASSISTED THE CAPT WITH THE SECURING CHKLIST AS WELL AS THE EMER CHKLIST. BETTER 'SUPERVISION' IS NEEDED TO INSURE THE ENG SAFETY ZONES ARE NOT VIOLATED WHILE THE ENGS ARE RUNNING. 'EXTRA CAUTION' HAS TO BE EXERCISED BY RAMP PEOPLE WHEN OPERATING/WORKING AROUND RUNNING ENGS ESPECIALLY IF THE WINDS ARE GUSTY AS THEY MAY HAVE BEEN THIS DAY.