An "On-condition" inspection is a non technical term, in other words it is not defined under definitions by the FAA in FAR 1.1 (Federal Regulations). However, FAR part 147 Appendix A Par(a)(1) defines non description "inspection" (on-condition is a inspection) as ***"to examine by sight and touch"***. By exclusion from other types of inspection such as "destructive", "magnetic resonance", etc - "On-condition" is an inspection able to be accomplished by an A&P using their "sight and touch". [jz pilot/A&P]