Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
June 20, 2022
Submitted
July 28, 2022
Operation
Air carrier
Aircraft
N486WN
Make and model
Boeing 7377H4
Aircraft serial
33852
Aircraft time
59,624 hours, 35,506 cycles
Part
Floorbeam
Condition
Corroded
Location
Fuselage
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

CORROSION ON PASSENGER CABIN FWD FLOORBEAM AT BS 328 RBL 47; RBL 48. / [01] REMOVED CORROSION ON UPPER FLANGE FLOOR BEAM BS 328 RBL 47 L=3.0 W= 1.0 D= .055 MATERIAL ORIGINAL .125' MATERIAL REMAINING .070' FOUND TO BE OUT OF LIMITS UPPER FLANGE FLOOR BEAM PER SRM 53-10-51-1A-1 TOOL USED ID ATS2472 DATE DUE 12/2022;14] FABRICATED REPAIR PARTS -1 T-CHORD FROM MAT. BAC1505-10024 7075-T6511 LOT# 5070057-1 -2 ANGLE (2EA) FROM MAT. BAC1490-2811 7075-T6 LOT# 1486278-1 -3 ANGLE (2EA) FROM MAT BAC1490-2900 7075-T6 LOT# 1486246-1 -4 SHIMS (10EA) FROM MAT. 0.100' 7075-T6 CLAD SHEET LOT# 1424649-1 -4 SHIM (2EA) FROM MAT 0.020' 7075-T6 CLAD LOT# 1472548-1 -5 ANGLE (1EA) FROM MAT BAC 1490-2651 7075-T6 LOT# 1483887-1; LOCATED AND DRILLED ALL REPAIR PARTS AND APPLIED CHEMICAL CONVERSION COATING IAW SRM 53-10-51-2R-7 REPAIR 7;[19] INSTALLED ALL REPAIR PARTS PASSENGER CABIN FLOOR BEAM AT BS 328 FROM RBL1 TO RBL 65 IAW SRM 53-10-51-2R-7 REPAIR 7;

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