Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
March 10, 2023
Submitted
April 18, 2023
Operation
Air carrier
Aircraft
N281WN
Make and model
Boeing 7377H4
Aircraft serial
36528
Aircraft time
51,516 hours, 31,045 cycles
Part
Floorbeam
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 RBL328 RBL10; 20;23;31 WL208.<[01] UPDATED PARTIAL STEPS 1-718] FABRICATED -5 ANGLE FROM BAC 1490-2651#7075T6 CLAD LOT#1483887-1; -4 (2EA) SHIMS AND -6 FILLER FROM 7075T6#0.020' CLAD LOT#1516841-1. TREATED IAW SRM 53-10-51-2R-7 REPAIR 7 TABLE 201 AND FIGURE 204 DETAIL F-F. OK TO PRIME REPAIR PARTS;[19] VERIFIED CORRECTIVE ACTION ITEM; OK TO PRIME.;[20] FABRICATED -1 REPAIR T-CHORD FROM BAC1505-100224 7050-T76511 EXTRUSION LOT#1521819-1; -2 (2EA) ANGLES FROM BAC1490-2811 7075-T6 CLAD LOT#1498610-1; -3 (3EA) ANGLES FROM BAC1490-2900 7075-T6 CLAD LOT#1519553-1 IAW SRM 53-10-51-2R-7 REPAIR 7 TABLE 201... OK TO TREAT AND PRIME REPAIR PARTS;[21] FABRICATED -4 SHIMS (9EA) FROM 7075T6#0.100' CLAD LOT#1489800-1 AND -4 SHIMS AT BL 0 COMMON TO REPAIR SPLICE FROM 7075T6#0.071 CLAD LOT#1497836-1 PLUS 7075T6#0.080' CLAD LOT#1492623-1 IAW SRM 53-10-51-2R-7REPAIR 7... OK TO TREAT AND PRIME REPAIR PARTS;[25] INSTALLED REPAIR PARTS IAW SRM 51-40-02 AND IAW SRM 53-10-51-2R-7 REPAIR 7;

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