Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
November 26, 2021
Submitted
December 27, 2021
Operation
Air carrier
Aircraft
N455WN
Make and model
Boeing 7377H4
Aircraft serial
32462
Aircraft time
58,698 hours, 34,771 cycles
Part
Floorbeam
Condition
Corroded
Location
Bs 986 Rbl28-44
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 PASSENGER CABIN FLOOR BEAM BS986.5 RBL28;32;40;44 WL208.1 ; / [01] REMOVED CORROSION FROM PASSENGER CABIN FLOOR BEAM BS 986.5 RBL 44 WL 208.1 IN AREA OF 2'X 1' X 0.038' DEEP ORIGINAL MATERIAL THICKNESS 0.150' FOUND TO BE OUT OF LIMIT IAW SRM 53-70-51-1A-1 DET. 4H(2B) FIG 103-C; [02] TOOLS USED DIGITAL CALIPER ID ATS2318; S/N B19006095; [03] VERIFIED ACTION 1; [04] INSTALLED EWIS PROTECTION AT BS 947 TO BS 1006 LBL 50 TO RBL 50 PER AMM 20-60-07-913-801; [05] REMOVED FLOOR BEAM PREVIOUS REPAIR AT BS 986.5 BL 0; TO RBL 50 PER SRM 51-40-02-0G-0;APPLIED CHEMICAL CONVERSION COATING AND PRIMER; IAW SRM 51-20-01 SOPM 20-41-02; OK TO INSTALL; [13] VERIFIED CORRECTIVE ACTION 12.<BR><BR>NOTE: REFERENCE ESR 21-02903; [14] INSTALLED FLOOR BEAM REPAIR AT BS 986.5 FROM BL 0; TO RBL 50 WL 208.1 IAW SRM 51-40-02-0G-0 AND SRM 53-70-51-2R-4 REPAIR 4; [15] 'REMOVED AND REPLACED BS 986 FLOOR BEAM REPAIR PER 737-700 SRM 51-40-02 AS SHOWN IN SWA EA 1-753-29161 REV IR; ATS ESR 15-05804 REV NEW';

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