# SDR SWAA2021081095317

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2021
- Submitted: August 10, 2021
- Operation: Air carrier
- Aircraft: [N7723E](https://openairdocs.org/aircraft/N7723E), registered now
- Make and model: Boeing 737-76N
- Registry model: [Boeing 737-76N](https://openairdocs.org/model/boeing-737-76n) (OpenAirDocs)
- Aircraft serial: 32670
- Aircraft time: 48,099 hours, 24,239 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Support
- Condition: Corroded
- Location: Bs 761-787
- 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/SWAA2021081095317

## Discrepancy

CORROSION ON UNDERSIDE OF FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BS761-BS787 LBL 21 WL156 ; / [01] REMOVED CORROSION AT FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BS 761-BS 787 LBL21 WL 156 MAX MATERIAL LOSS L=2.5';W=0.9';D=0.018' FOUND TO BE WITHIN LIMITS IAW SRM 53-00-53-1A-2 STEP 4A(2)(A) FIG 103 AND DWG 146A7502 TOOL USED ID:ATS1672 S/N:65092939 DUE 03/2022; [02] CORRECTION: FOUND TO BE OUT OF LIMITS; [03] VERIFIED EVALUATION AND FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2; [04] LOCATED AND DRILLED NEW EXTRUSION FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY FROM BS727 THRU BS847 LBL21 WL156 IAW SRM 51-40-05 AND DWG 146A7502<BR>OK TO PROTECTIVE TREATMENT; [05] AND SPLICE FABRICATION IAW SRM 53-00-53-2R-6; [06] VERIFIED LOCATE AND DRILL UP OF NEW SUPPORT AND SPICE MATERIAL; OK TO PROCEED AFTER LOT # ID IS UPDATED BY AMT FOR MATERIAL; [07] UPDATED; EXTRUSION BAC1496-377 LOT# 1462654-1; [08] APPLIED CONVERSION COATING AND PRIMER ON NEW PARTS IAW SRM 51-20-01 AND SOPM 20-41-04.; [09] VERIFIED STEP 7 AND 8; [10] OK TO INSTALL FLOR TO SIDEWALL SUPPORT BS727 TO BS 847 LBL 21 WL 156; [11] VERIFIED OK TO INSTALL STEP 10.; [12] INSTALLED FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BS 727 TO BS 847 LBL 21 WL 156 IAW SRM 51-40-02 AND DWG 146A7500; [13] VERIFIED FLOOR TO SIDEWALL SUPPORT INSTALL PER SRM AND DWG.; [14] COMPLETE

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.