What was found
DURING HEAVY MAINTENANCE: WINGS / CENTER WING BOX / FLOOR BEAM JUNCTION TO FRONT SPAR VERTICAL STIFFENER / @ LEVEL OF FR36 & Y+254, Y+765, Y-254 & Y-765 / HOLES #1 & #2 / CRACKS – PERMANENT REPAIR; REFERENCES: /1/ AAR-LCQ FINAL REO-L25783 REV. IR /2/ AIRBUS DOSSIER 81744610 /3/ AIRBUS RDAF 81744610/003/2026 ISSUE B /4/ AIRBUS REPAIR INSTRUCTION (RI) R571-12154 ISSUE C /5/ AIRBUS SERVICE BULLETIN (SB) A320-57-1178 REV. 04 (JB EC 2024-12-01-FAA-01) /6/ MX-244 FOR EC A26-269-01 (MAJOR). DESCRIPTION: AT THE CURRENT (03/2026) C9 & INTERIORS RESTYLE CHECK @ LCQ FOR A/C N524JB (MSN01528), WHILE ACCOMPLISHING INSPECTIONS PER REF /5/ SB, AAR REPORTED CRACKS AT FASTENER HOLES #1 & #2 COMMON TO THE CENTER WING BOX FR36 FLOOR BEAM JUNCTION TO THE FRONT SPAR VERTICAL STIFFENERS (Y+254, Y+765, Y-254 & Y-765). SEE REF /1/ AAR-LCQ FINAL REO FOR MORE DETAILS. AAR HAD ACCOMPLISHED REAMING OF THE CRACKED HOLES ALONG WITH NDT INSPECTIONS BUT THE CRACKS STILL REMAINED. THUS, AIRBUS WAS CONTACTED FOR REPAIR INSTRUCTIONS AND PROVIDED INSTRUCTIONS VIA REF /3/ DOSSIER TO ACCOMPLISH REPAIR IAW REF /4/ RI WHICH CONSISTED OF TRIMMING OF AFFECTED BEAMS AND APPLICATION OF A CWB UPPER BEAM SPLICE REPAIR. THESE INSTRUCTIONS ARE APPROVED BY THE REF /3/ RDAF AS PERMANENT WITH NO POST REPAIR INSPECTIONS REQUIRED. THIS EC A26-269-01 ACCOMPLISHES THE PERMANENT REPAIR PER THE REF /1/ AAR-LCQ FINAL REO AND COMPLIES WITH THE REF /3/ RDAF WITHOUT DEVIATION. NOTE: MSB A320-57-1228 IS NO LONGER APPLICABLE AT THE REPAIRED LOCATIONS (Y+254, Y+765, Y-254 & Y-765). SPLICE REPAIR DOES NOT IMPACT ISB A320-57-1178. SUBSTANTIATION: THIS PERMANENT, CATEGORY A, REPAIR IS APPROVED BY REF /3/ RDAF AND IS CLASSIFIED AS MAJOR PER THE GUIDELINES SPECIFIED IN REF /6/ MX-244. (E/C: A26-269-01)