What was found
DURING RECURRING 400 HR INSPECTION REQUIRED BY AD, FOUND AFT FUSELAGE RT BLEED AIR DUCT ASSY. BELLOWS BRAIDED WIRE MESH BLOWN OUT OF END FITTINGS. SUSPECTED TO BE CAUSED BY BLEED AIR LEAK FROM EITHER CRACKED BELLOWS OR FATIGUE/TUBING MIS-ALIGNMENT STRESS. REPLACED TUBE ASSY WITH SUPERSEDING (PN 45A63517-075) TUBE ASSY. RECOMMEND POSSIBLE AFT FUSELAGE BLEED AIR TUBING OF OLDER PN`S HAVE A 5000 HR LIFE LIMIT. (K)