What was found
WHILE PERFORMING 13-5310-EO-212, AD 2015-05-04 - AFT FUSELAGE UPPER LT SKIN AND LONGERON - REPETITIVE INSPECTION; A CRACK WAS FOUND IN THE O/B ATTACH FITTING/DOUBLER (BEST GUESS IS P/N 206-033-306-036), WHERE THE L/H UPPER LONGERON ATTACHES TO THE BULKHEAD STATION 204.92. THE I/B SIDE OF THE LONGERON IS EXPOSED AND SHOWS NO SIGNS OF A CRACK. IT APPEARS TO BE LIMITED TO THE ATTACH/DOUBLER FITTING; GOING THROUGH THE FORWARD LOWER RIVET AND EXTENDING UP. REFERENCED MM FUSELAGE FIG 53-49, ITEM 21.