I beg to differ. I've PERSONALLY WATCHED one person get sucked into the engine on an S-3A Viking running on the ground FROM FIVE FEET AWAY!!!!!!!!!!!!!!!!!!!!!!!! The engine in question was a GE TF-34 high bypass turbine with 9000lbs of thrust. If that turbine can pull an approximately 175lb man into it from 5ft away, while the aircraft is tied down to the deck, how much suction is there going to be from a CFM-56-7 61" fan rated 19,000lbs of thrust on a 737 or the the GE90 and Pratt & Whitney PW4090 used on the 777? The GE90 is rated at 74,000 to 115,000lbs of thrust, the PW4090 about the same while having a mouth of approximately 100" There is established "safe zones" at the airport terminals for the ground crews for a reason, to prevent the death of ground personnel and the destruction of turbine engines