The accumulator in the TR system ?
The NYC accident ship was a BA and they don't have a T/R accumulator. Some years back the Australian Army 350's had accumulators fitted but the Type Specification for the civil BA doesn't include an accumulator.
It seems that this guy had a definite problem with the T/R, and we will eventually find whether it was a drive or control problem. Note that one TV station reported that "a mechanic had fitted the wrong clutch".
The NTSB will put an end to all the guesses in due course and until then we should be thankful that it was a survivable accident.
STL