Is "as an assembly worker" a dangling modifier in the following?
As an assembly worker, your duty is to check products for defects.
I'd appreciate your help.
It is simply a reordering of Your duty as an assembly worker...
Compare:
As an artist his impulse is to express himself ...
As an artist his aim was to reproduce ...
As an artist his latest productions were ...
as an artist his facility became in part paralysed by awe.
as an artist his interest in her daughter's appearance was a ...
As a singer his seemingly lazy intonation ...
as a doctor his background would be more thoroughly investigated...
(I originally said the following in a series of comments, then thought I should turn it into an actual answer.)
It is not a dangling modifier. A dangling modifier confuses subject with object. That is not the case here. There is a clear subject (you) who can perform an action (checking for defects) on an object (the products).
A possible version of this, that would be an example of a dangling modifier is:
Having checked for defects, the products were assembled.
That's wrong because it implies that the products were doing the defect checking, not you.
In your sentence, as an assembly worker is simply a subordinate clause.