Service difficulty report · Sidewall Support · Boeing 7377H4

Difficulty date
April 25, 2023
Submitted
May 25, 2023
Operation
Air carrier
Aircraft
N959WN
Make and model
Boeing 7377H4
Aircraft serial
36674
Aircraft time
38,285 hours, 23,370 cycles
Part
Sidewall Support
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

MULTIPLE AREAS OF CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21 BS 727E-807 WL 154-157.<[01] VERIFIED APPLICABILITY PER SRM 53-60-53-0I-2 AND SRM 53-00-53-1A-2. REMOVED CORROSION ON DISCREPANCY AREAS L=6'; W=.900'; D=0.010'. FOUND TO BE OUT LIMITS IAW SRM 53-00-53-1A-2 STEP 4A(2)(A)FIG3.<BR>TOOL USED ID:ATS2826 DUE:01/3/24;[02] VERIFIED CORRECTIVE ACTION 1 ;FOUND TO BE OUT OF LIMITS.;[03] FABRICATED NEW ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL21 BS 727 TO BS 847 FROM BAC1496-377#7075T62 CLAD LOT#1521599-1 IAW SRM 51-40-05 AND DWG 146A7502 AND FABRICATED SPLICE SIDEPLATE ON BS 747+10 FROM BAC1496-377#7075T62 CLAD LOT#1521599-1 IAW SRM 53-00-53-2R-6.<BR>OK TREAT AND PRIMER;[04] VERIFIED CORRECTIVE ACTION 3. OK TO TREAT AND PRIME.;[05] APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW SRM 51-20-01 AND SOPM 20-41-02. <BR>OK TO INSTALL SPLICE SIDEPLATE 0N BS 747+10;[06] VERIFIED CORRECTIVE ACTION 5- OK TO INSTALL.;[07] INSTALLED SPLICE SIDEPLATE ON FLOOR TO SIDEWALL SUPPORT BS747+10 IAW SRM 51-40-02 AND SRM 53-00-53-2R-6 REPAIR 6;[08] RII VERIFIED CORRECTIVE ACTION ITEM 7.;[09] ALL RII REQUIREMENTS COMPLETED.;[10] ALL STEPS COMPLETED;[11] VERIFIED ALL STEPS COMPLETE.

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