5574581d_ection__Inspection__and_Repair__Definition
[Zone Designation] 3 [Description] Strike locations other than Zone 1 and Zone 2 [Definition] 
Those surfaces not in Zone 1A, 1B, 1C, 2A, or 2B, where any attachment of the lightning channel is unlikely, and those portions of the airplane that lie beneath or between the other zones and/or conduct a substantial amount of electrical current between direct or swept stroke attachment points.
Lightning Strikes: Protection, Inspection, and Repair
Definition