What does "throttle is staggered" mean? and how is it related to adjustment of MEC(Main Engine Control) in B737-300(CFM56-3C)?and which are safety issues regarding that?
If I was a mechanic looking at that snag, I would assume the pilot is complaining the two thrust levers are way out of alignment when engine N1s are matched. They are usually never 100% perfectly aligned, but most pilots will start to complain if the stagger is more than, say, a quarter of the width of the lever handles.
This makes setting power a pain in the butt, and can be an issue in an abnormal procedure when you have to set go around thrust on a missed approach, and more care and tweaking is required by the pilot setting thrust. Basically, higher workload in abnormal situations is the risk factor.
The engine being non-FADEC, there is a need to check the rigging/adjustment between the thrust levers and the fuel control system, or within the fuel control system itself.