SDR UPS02438950

Service difficulty report · Longeron · Boeing 747123F

Difficulty date: July 2, 2002
Submitted: August 6, 2002
Operation: Air carrier
Aircraft: N677UP
Make and model: Boeing 747123F
Aircraft serial: 20391
Aircraft time: 88,072 hours, 22,099 cycles
System (JASC): 5313 · Fuselage Main, Longeron/Stringer
Part: Longeron
Condition: Corroded
Location: Fuselage
Stage of operation: IN
How discovered: V
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

INSPECTION TYPE: C, RT BLG W/W AT BS 1416 RBL 110 ON TOP OF OVERWING LONGERON VERTICAL SUPPORT FRAME MATING SURFACE CORROSION FOUND AS RED MARKED AND ON TOP OF THIS DEFECT THE CROSS-OVER STRINGER CORROSION FOUND AS RED MARKED. CORROSION BLEND OUT DEPTH THROUGH THICK, WIDTH .25 INCH, LENGHT 2.125 INCH EXCEED SRM LIMIT. BS 1350 - 1480 RT OVERWING LONGERON REPAIRED IAW RS R-53-43-34843, (UPS EO B747-5310-17206-A).