Post
by Evergreen 44 » Mon May 11, 2020 6:51 pm
Just a guess but there should be either a stock number like NSN- etc or some other on either the side of the unit or stamped onto the casing plus a manufacturer such as Plessey or Racal etc. usally with the Government 'Crowsfoot' mark on it
When these items are are removed for maintenance they have a paper tag (in the old days) nowadays a bar-code linking it to the stock/serial number (I.e. unique equipment reference ) such that certified maintenance can be carried out and the work being traceable to that equipment / aircraft / fitter parts used etc.