Dont know what it means but I guess I will keep others from having to look it up.

5. If a trip’s ACH exceed OSC or the trip is operationally extended past its original scheduled return time, a pilot shall earn overage CH computed as the higher of:

a. ACH minus the sum of OSC for the trip and SCH of any subsequent trip(s) removed with pay due to actual conflict; or

b. trip rig computed for the time the extended trip conflicts with time the pilot was scheduled to be free from duty at base, if such time exceeds 2 hours.