What was found
DURING HEAVY MAINTENANCE: RUDDER ASSY HINGE FITTING BR1 WITH CRACK INDICATION; EC A24-811-01 ASSIGNED TO THIS REPAIR. DURING C9 CHECK ON N510JB (MSN 01280) AT MXA DATED JUN 2024, WHILE ACCOMPLISHING FORK END FITTING REPLACEMENT, CRACKED AND ELONGATED HOLE WERE FOUND AT HOLE #5 HINGE ARM BR1 ON VERTICAL STABILIZER. HOLE WAS REAMED TO 8.103MM DIAMETER BUT CRACK STILL PERSISTED (0.508MM IN LENGTH ON THE BOTTOM FLANGE OF HINGE ARM BR1). REFER TO REF /1/ EO FOR DETAILS.THE DAMAGE WAS EVALUATED AGAINST A320 SRM TASK 55-36-42-300-008, BUT WAS FOUND TO BE OUT-OF-LIMIT DUE TO THE HOLE DIAMETER. THEREFORE, AIRBUS WAS CONTACTED FOR ASSESSMENT AND PROVIDED REPAIR INSTRUCTIONS BY MEANS OF REF /2/ TD TO REPLACE HINGE ARM BR1 WITH PN: D553-71321-000-53 PER A320 SRM TASK 55-36-42-300-003 WITH DEVIATION FOR FASTENER PATTERN, PITCH AND EDGE MARGIN CONSIDERING AIRCRAFT MOD STATUS. THESE INSTRUCTIONS ARE APPROVED BY REF /3/ RDAF AS A CAT A PERMANENT REPAIR. EC A24-811-01 ACCOMPLISHES PERMANENT REPAIR PER THE REF /1/ EO AND COMPLIES WITH REF /3/ RDAF WITHOUT DEVIATION. SUBSTANTIATION: THIS REPAIR (PART REPLACEMENT) IS APPROVED AS CAT A REPAIR PER REF /3/ RDAF AND IS CLASSIFIED AS OTHER.