I've asked around (even the heavy check guys), no one seems to know what that means. Is there any type of preamble to those work cards? A lot of acronyms are explained there.
There is no preamble to the task cards in the front matter section. I guessed it is abbreviation of "airplane" and it means skill which is related to airframe and system that excludes avionics and electrical system and engine and APU. However what surprised me is that it is assigned to general visual inspection of EWIS.??!!
I was also unable to find the exact definition, I found it in a 747 task card index. It's list the possible skills as (Airpl, ENGIN,AVION,ELECT,SHOPS) So I guess that it means airplane and used whenever one of the other definitions does not fit.