What was found
RIGHT CENTER SECTION SKIN CRACKED 2.0 INCHES BETWEEN RIVETS AT DOUBLE ROW RIVET SKIN JOINT BETWEEN RIVETS. LOCATION ON SKIN IS JUST AFT OF MAIN WING SPAR CAP AT BL 16.25. THIS AREA IS PART OF THE PRESSURE VESSEL, BEFORE TRANSITION TO THE UNPRESSUREIZED WING. LEFT CENTER SECTION SKIN CRACKED .75 INCH BETWEEN RIVETS AT DOUBLE ROW SKIN JOINT-BETWEEN RIVETS. LOCATIONS ON SKIN IS JUST AFT OF MAIN WING SPAR CAP AT BL 16.25. THIS AREA IS PART OF THE PRESSURE VESSEL, BEFORE TRANSITION TO THE UNPRESSUREIZED WING. PROBABLE CAUSE UNKNOWN. MAY BE RESULT OF PRESSURE CYCLES, OR FATIGUE FROM LANDING CYCLES, OR VIBRATION.