[Sealander]

Nick,
could it be that the full text on the plate is F.W.Arbeitszylinder ?

If this is the case it means that you are looking at the plate of the FAHRWERK ARBEITSZYLINDER

Or in English the servo cylider for the retractable landing gear.
I understand that the cylinders were placed in the wing.
Hope my sugestion is of any help
regards
Sealander