This document provides standards for Aeronautical 
Telecommunication Network functions for aircraft systems and 
equipment.  These standards are in the form of performance 
criteria for ATN functions; qualification criteria for 
demonstrating performance requirements; descriptions of 
evidence that indicate that performance objectives have been 
satisfied. Performance objectives, qualification and evidence 
are discussed as they relate to satisfying the requirements for 
airworthiness approval of ATN functions.  The functions covered 
by the MOPS can be incorporated in a wide variety of hardware 
configurations onboard an aircraft.  Section 2 of the document 
expresses the requirements for airborne ATN systems.  Section 3 
describes the means of qualification by providing an overview 
of the testing process and listing detailed tests.