What was found
ON APPROACH INTO PHX EN ROUTE FROM ATL WHEN SELECTING FLAPS 1 THE SLATS LOCKED OUT AT SLATS 1, FOLLOWED ECAM INSTRUCTIONS AND PERFORMED PRECAUTIONARY LANDING. MAINTENANCE TROUBLESHOT SLAY SYS PER TSM 27-81-00-810-815 AND FOUND LT WING TIP BRAKE ASSY BREAK OUT FORCE AT 80 IN LBS, LIMIT IS 44 IN LBS. R & R LT WING TIP BRAKE ASSY IAW AMM 27-81-00-000, OPS CHECK OF SLAT SYS GOOD. VENDOR REPORTED THAT RETURN OF WING TIP BRAKE SN 456 WAS JUSTIFIED AND CONFIRMED NOTING ON DISASSEMBLY THAT SPRING, FIG. 4-5A OF CMM 27-09-12 REV 8, WAS UNDERSIZED AND BALL BEARING, FIG 3-140A AND FIG 4-100A FROM CMM 27-09-12 REV. 8, WAS RUNNING ROUGH. UNIT WAS TESTED AND OVERHAULED IAW CMM 27-09-12 REV. 8