Modern, ultra high bypass engines (CF-90, 4084, TRENT, GENXT) can and will pull you in if you are too close to them or wearing something baggy like a rain suit or poncho. And you are heading into the 'MECHANAMATIC' it makes mounds and mounds of shredded mechanic'.
In my DC-10 classes I used caution the students that both ends of a CF-6 (JT-9's too) running on the ground was a real hazard to their safety all the time, and if the aircraft shifted aft and the nose gear 'ground shift' switch was activated by extending the nose strut, the engines would go to 45% or flight idle automatically. In that scenario if you were launching and wearing a rainsuit or poncho the engines can suck you in from the nose gear comm plug port next to the nose strut and you will have 1.31 seconds to aim for the hub spinner inside the 10 foot diameter inlet (no IGV's like on a JT-8), out the back the exhaust blast will knock you a$$ over teakettle up to 1/4 mile behind one running, that's why carriers flying DC-10/11's usually waited until they were clear of any terminals or windows before lighting off the center engine.
The CF-90 on a triple 7 is 13.5 feet in diameter, it can swallow a 737 fuselage and some in service are making in excess of 125000 lbs/thrust and will evolve to over 170000 lbs/thrust in the future.
Like Elmer Fudd said 'be vewwy, vewwy careful'
For some reason ,this thing insists on putting the 'cool' emoticon where I want it to say JT-8
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