SDR UPS06447657

Service difficulty report · Floorbeam · Boeing 747123F

Difficulty date: July 11, 2006
Submitted: August 14, 2006
Operation: Air carrier
Aircraft: N676UP
Make and model: Boeing 747123F
Aircraft serial: 20101
Aircraft time: 83,907 hours, 23,132 cycles
System (JASC): 5315 · Fuselage Main, Floor Beam
Part: Floorbeam
Condition: Corroded
Location: Bs 520
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LT BS 520 UPPER DECK FLOORBEAM AFT FLANGE 5 FASTENER HOLES FOUND CRACK AND/OR CORROSION AT LBL 34, LBL 45, LBL 49, AND LBL 55" (CRACK LENGTH 0.060" , CORROSION BLEND OUT 0.075" X 1.5" X 2"). CORROSION EXCEED SRM 53-10-01 FIG 1 LIMITS, U/D BS 520 FLOORBEAM UPPER CHORD REPAIRED AS PER HX RS NR R53-25-35537, C/O INSPECTION PER AD 2005-20-29 AND RS NR R53-25-35537 REF E AND REF G WITHIN 15000 CYC AFTER CHORD REPLACEMENT AND REF UPS EO NR B747-5310-24843-A.