You can have your own charts and/or documents that appear in Aviation Tools for a specific airport !
Just create a directory in your Aviation Tools directory (on SDCard) name User (it should already exists), and put your maps in it.
File must be in PDF format and filename must start with the ICAO code, eg :
EDAC_VAC.pdf, EDAC_IAC.pdf, etc..
Your maps will then appear in Aviation Tools prefixed with “User” :