Upper Michigan BUFF base mid winter -20f or so Getting off crew bus to preflight, the crew chief decided to moon us via the copilots window.
He became stuck to the window and needed the window heat turned on to free him.
EC-135 took off and felt intermittent chatter in the cyclic during turns. The ac had returned earlier from phase maintenance 5 days earlier and had flown numerous times by the other shift pilots.
Had maintenance look over the ac and they found a spool of safety wire in the flower vase on the head. The other pilots said they noticed something but didn’t follow up on it.