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 STA 986.5 FLOOR BEAM UPPER FLANGE AT RBL 46; 43.5; AND 40.5; WL 208.1 CORROSION ON STA 986.5 FLOOR BEAM UPPER FLANGE AT RBL 35.5 39.5 AND 43 WL 208.1 [TTG8Q00JF8G0]<[01] SRM 53-70-51-0I-1 IDENTIFICATION AND SRM 53-70-51-1A-1 ALLOWABLE DAMAGE ARE APPLICABLE;[07] FABRICATED; LOCATED AND DRILLED 1E/A STRAP (LOT#1489800-1); 1E/A ANGLE (LOT#1462657-1); 3E/A FILLER REPAIR (LOT#1385019-1) IAW SRM 53-70-51-2R-6 PART 4.F(4) TO 4.G; ALTERNATIVE 4 TABLE204 FIG206.<BR>REFER TO EA-23-153-00880-WIP1; WIP2.;[08] VERIFIED STEPS 6 AND 7;[09] APPLIED PRIMER ON ALL REPIR PARTS IAW SRM 53-70-51-2R-6 REPAIR 6 AND EA-23-153-00880-WIP1; OK TO INSTALL;[10] VERIFIED CORRECTIVE ACTION 9.<BR>OK TO INSTALL;[11] INSTALLED REPAIR PARTS ON FLOOR BEAM 986.5 AT RBL 40 TO RBL 46 IAW SRM 53-70-51-2R-6 REPAIR 6 AND EA-23-153-00880-WIP3;[12] VERIFIED CORRECTIVE ACTION STEP 11.;[13] CORROSION ON BS 986.5 FLOOR BEAM UPPER FLANGE AT RBL 46; 43.5 AND 40.5; WL 208.1 WAS REPAIRED IAW EA 23-153-00880;[14] VERIFIED CORRECTIVE ACTION 13 AND MEASUREMENT TABLE.

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