Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
June 7, 2023
Submitted
July 17, 2023
Operation
Air carrier
Aircraft
N963WN
Make and model
Boeing 7377H4
Aircraft serial
36676
Aircraft time
38,123 hours, 23,431 cycles
Part
Floorbeam
Part number
UNKNOWN
Condition
Corroded
Location
Zn 100 Fus Lower
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 FLOOR BEAM AT FWD CABIN BS328 RBL40 WL208.<[01] VERIFIED THE APPLICABILITY OF SRM 53-10-51-0I-2 AND SRM 53-10-51-1A-1[15] FABRICATED FOR BS 328 FLOOR BEAM UPPER CHORD -1 T-CHORD FROM BAC1505-100224 7050-T76511 EXTRUSION LOT #1530415-1 ; FABRICATED -2 (2EA) ANGLES FROM BAC 1490-2811 7075-T6 CLAD FORMED ANGLE LOT #1498610-1 ; FABRICATED -3 (2EA) ANGLES FROM BAC 1490-2900 7075-T6 CLAD FORMED ANGLE LOT # 1519553-1 ; FABRICATED -4 SHIMS (9EA) FROM 7075-T6 CLAD SHEET 0.100' LOT# 1489800-1 ; AND FABRICATED -4 SHIMS FOR THE INITIAL STIFFENERS THAT IS IN-LINE WITH THE REPAIR SPLICE ANGLES AT THE FWD SIDE FROM 7075T6 CLAD 0.071' LOT #1478276-1 AND FROM 7075T6 CLAD 0.080' LOT # 1492623-1 .<BR>AND FABRICATED PARTS FOR THE MACHINED INTERCOSTAL ATTACHED TO THE FLOOR BEAM AT BL 24.82 -4 SHIMS (2EA) FROM 7075-T6 CLAD SHEET 0.020' LOT # 1516841-1 ; -5 ANGLE FROM BAC 1490-2651 7075-T6 CLAD FORMED ANGLE LOT # 1483887-1 AND FABRICATED -6 FILLER FROM 7075-T6 CLAD SHEET 0.020' LOT # 1516841-1 ; LOCATED AND DRILLED ALL REPAIR PARTS IAW SRM 53-10-51-2R-7 REPAIR 7 ; OK TO TREAT AND PRIME ALL REWORKED AREARS AND REPAIR PARTS;

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