# SDR SWAA2023060143253

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2023
- Submitted: June 1, 2023
- Operation: Air carrier
- Aircraft: [N961WN](https://openairdocs.org/aircraft/N961WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36962
- Aircraft time: 37,902 hours, 23,158 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: 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/SWAA2023060143253

## Discrepancy

MULTIPLE AREAS OF CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21 BS 727+5-807 WL 155-157.<[01] VERIFIED APPLICABILITY SRM 53-60-53-0I-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE.<BR><BR>REMOVED CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21 BS 727C+6 IAW SRM 51-10-02.<BR><BR>EVALUATED BLENDED AREA L=1.5' W=0.800' ORIGINAL THICKNESS 0.040' PER BAC1496-377 REMAINING 0.027' LOSS 0.013'; MAX MAT REMOVED ALLOWED 0.004'; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 PARA 4A (2) FIG 103 DETAIL D.<BR>TOOL ID: ATS 2827 S/N: UNKNOWN DUE:01/31/24.;[02] VERIFIED CORRECTIVE ACTION ITEM 1; OUT OF LIMITS.;[03] FABRICATED LOCATED AND DRILLED<BR>NEW FLOOR TO SIDEWALL SUPPORT AND SPLICE<BR>FROM BS727+5 TO BS847 LBL 21 WL 155<BR>IAW SRM 51-40-05-0G-0; SRM 53-00-53-2R-6 AND DWG 146A7500 MATERIAL USED BAC1496-377#7075T62 LOT: 1515191-1<BR>OK TO TREAT AND PRIME ON<BR>NEW FLOOR TO SIDEWALL SUPPORT AND NEW SPLICE;[04] VERIFIED CORRECTIVE ACTION ITEM 3; OK TO TREAT AND PRIME PARTS.;[05] TREATED AND PRIMED REPAIR SPLICE AND SIDEWALL SUPPORT ANDGLE 2EA PER SRM 53-00-53-2R-6 AND AMM 51-21-72-370-804; OK TO INSTALL REPAIR SPLICE;[06] OKAY TO INSTALL REPAIR SPLICE IS GIVEN.;[07] INSTALLED REPAIR SPLICE BETWEEN BS 727E TO BS 747 LBL 21 WL 155 AT L/H FLOOR TO SIDEWALL SUPPORT PER SRM 53-00-53-2R-6

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