Service difficulty report · Floorbeam · Boeing 747422

Difficulty date
September 20, 2013
Submitted
September 27, 2013
Operation
Air carrier
Aircraft
N127UA
Make and model
Boeing 747422
Aircraft serial
28813
Aircraft time
56,281 hours, 6,537 cycles
Engine
Pwa PW4056
Part
Floorbeam
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

MAIN DECK FLOOR BEAM AT BS1700 LBL2 TO RBL 28 FOUND CORRODED. BLENDED OUT CORROSION OF MAIN DECK FLOOR BEAM AT BS 1700 LBL2 TO RBL 28. MATERIAL LOSS EXCEEDED SRM ALLOWABLE LIMITS. TRIMMED UPPER T CHORD, ACCOMPLISHED HFEC, NO DEFECT NOTED. FABRICATED & INSTALLED UPPER T-CHORD STRAP FROM LBL 2 TO RBL 28 IAW SRM 53-60-51 REPAIR 1.