B767-300 and 300 ER
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft X had damage to Number 5 slat O/B rib when the duct joint blew out which caused the lower fitting assembly to break off causing damage to the outer rib on the O/B side of the slat at location 531.75. The fitting assembly was attached with screws and nuts which is wrong per the IPC [Illustrated Parts Catalog]. The rivets it calls out for are BACR15BA5A; which would allow the rivet to shear in this event; not causing any structural damage. This damaged rib is not repairable. I have dealt with this before on other 767-300 and they were grounded because of wrong fasteners installed. I noticed on the Number 4 slat the same fasteners are installed at these locations which should be rivets.Inspect slats for proper fasteners installed so this doesn't happen again and cause a slat change.
Technician reported that during a previous repair to slat; incorrect fasteners were installed allowing damage to occur as a result of duct joint blowout. Proper fasteners should have been installed per the IPC (Illustrated Parts Catalog).