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 can not upload the picture, so may I request you to kindly explain how I can verify that ADS-B out system is installed from appearance of the control panel and part number of the transponder.