Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
May 2, 2023
Submitted
June 1, 2023
Operation
Air carrier
Aircraft
N285WN
Make and model
Boeing 7377H4
Aircraft serial
32536
Aircraft time
51,630 hours, 31,054 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 BS 986 FLOOR BEAM FWD FLANGE RBL 36-43 WL 208.<[01] SRM 53-70-51-1A-1 IS APPLICABLE ALLOWABLE DAMAGE; UPDATED TABLE;1] LOCATED AND DRILLED REPAIR PARTS ITEM 1 T-CHORD (1EA) ;ITEM 2 ANGLE (2EA);ITEM 3 ANGLE (2EA);ITEM 4 STRAPS (2EA) AND ITEM 7 R/H SHEAR TIE (1EA) ALL REPAIR PARTS PROVIDED BY COSTUMER ON BS986 FLOOR BEAM KIT 53199911-01 ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4.G-M;17] LOCATED AND DRILLED NEW CORNER FITTING (2EA) FABRICATED ON P.O # 918339-SWA ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4.G-L OK TO PRIMER;[19] CORRECTIVE ACTION 17 ADDED CERTS NUMBER SHOULD READ LOCATED AND DRILLED NEW CORNER FITTING (2EA) FABRICATED ON P.O # 918339-SWA;918339-SWA-1 ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4.G-L OK TO PRIMER[21] INSTALLED ITEM 1 T-CHORD (1EA); ITEM 2 ANGLE (2EA); ITEM 3 ANGLE (2EA); ITEM 4 STRAPS (2EA) AND ITEM 7 R/H SHEAR TIE (1EA) EXCEPT ON AREA COMMON TO INTERCOSTAL BS986 RBL38 ALL I.A.W SRM 53-70-51-2R-4 REPAIR 4.N-O;[22] INSTALLED 100% TEMPORARY AND PERMANENT FASTENER ON REPAIR AREA BEFORE SQUEEZE OUT TIME I.A.W SRM 53-70-51-2R-4 REPAIR 4.N-O AND SOPM20-50-19 COMPLETE STEPS 5;6.[28] PRIMER CORNER FITTINGS I.A.W SRM 53-70-51-2R-4 REPAIR 4.M; OK TO INSTALL STEP 4; AND UPDATED INSTALL STEPS 7;8;[31] INSTALLED CORNER FITTINGS I.A.W SRM 53-70-51-2R-4 REPAIR 4.N-O AND COMPLETE STEP 4.[33] COMPLETED BS 986 RBL 17-RBL50 WL208 FLOOR BEAM REPAIR I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2;

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