# SDR SWAA2023042518162

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 17, 2023
- Submitted: April 25, 2023
- Operation: Air carrier
- Aircraft: [N957WN](https://openairdocs.org/aircraft/N957WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 41528
- Aircraft time: 38,518 hours, 23,626 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sidewall Support
- Condition: Corroded
- Location: Zn 100 Fus Lower
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2023042518162

## Discrepancy

AFT CARGO COMPARTMENT - MULTIPLE AREA OF CORROSION ON SIDEWALL SUPPORT AT BS 727 TO BS 847 LBL 21.75 WL 155. (MARKED)<REMOVED CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21.75 BS 767+3<BR>DIMENSIONS L=12.00' W= 2.00' DEPTH:0.035'<BR>ORIGINAL MATERIAL THICKNESS 0.040' IAW BAC 1496-377 REMAINING THICKNESS : 0.005'<BR>AND FOUND TO BE OUT OF LIMITS; IAW SRM 53-00-53-1A-2<BR>TOOL USED: ID ATS 1698 S/N: 1505370 DUE: 05/2023 FABRICATED SPLICE ON FLOOR TO SIDEWALL SUPPORT L/H ACB WITH MATERIAL BAC1496-377; LOT# 1521599-1; PER SRM 53-00-53-2R-6; FIG. 203<BR><BR>FABRICATED NEW FLOOR TO SIDEWALL SUPPORT L/H ACB WITH MATERIAL BAC1496-377; LOT# 1521599-1; PER SRM 51-40-02 AND DWG 146A7502; OK TO TREATMENT;[05] VERIFIED CORRECTIVE ACTION #4<BR>OK TO TREAT GIVEN;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON REPAIR PARTS IAW SRM 51-20-01 AND SOPM 20-41-02.<BR>OK TO INSTALL (1EA) SPLICE PLATE AND BOND NUTS PLATES INSTALLED SPLICE REPAIR LOCATED BETWEEN BS 727E+10 - 747 IAW SRM 51-40-02 AND SRM 53-00-53-2R-6; REPAIR 6 FIG.203 SHEET 1<BR>INSTALLED BOND NUTS PLATES IAW 140N4500.;[09] AFT CARGO COMPARTMENT AT FLOOR TO SIDEWALL SUPPORT LOCATED BETWEEN BS 727 - 847 LBL 21.75 WL 155 WAS (1EA.) INSTALLED SPLICE REPAIR LOCATED BETWEEN BS 727E+10 - 747 IAW SRM 51-40-02 AND SRM 53-00-53-2R-6; REPAIR 6 FIG.203. <BR>INSTALLED BOND NUTS PLATES IAW DWG# 140N4500.;[10] THE REMOVAL AND INSTALLATION WILL BE ACCOMPLISHED WITH THE CUSTOMER CARD # TTG8Q0049HEA

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