# SDR SWAA2023042521286

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2023
- Submitted: April 25, 2023
- Operation: Air carrier
- Aircraft: [N8529Z](https://openairdocs.org/aircraft/N8529Z), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 36974
- Aircraft time: 19,992 hours, 9,666 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- 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/SWAA2023042521286

## Discrepancy

CORROSION AFT CARGO BAY SUB THRESHOLD WEB MULTIPLE AREAS AROUND NUT PLATE HOLES BS794 TO BS847 RBL 26.5 WL156<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 794.5+8' REMOVED 0.020' IN A AREA OF 1'X1' ORIGINAL THICKNESS 0.045' FOUND TO BE OUT OF LIMITS PER SRM 53-60-15-1A-1 USING ATS TOOL ID ATS 2473 DUE 08/2023;[02] VERIFIED CORRECTIVE ACTION 1 AND MEASUREMENT TABLE;[03] LOCATED; DRILLED; DEBURRED; AND INSTALLED NUT PLATES ON NEW AFT CARGO BAY SUB THRESHOLD WEB BS794 TO BS847 RBL 26.5 WL156 IAW SRM 51-40-02 AND DWG #146A8340.;[04] VERIFIED CORRECTIVE ACTION 3.;[05] OK TO INSTALL SUB THRESHOLD WEB;[06] OK TO INSTALL IS GIVEN.;[07] INSTALLED AFT CARGO BAY SUB THRESHOLD WEB BS794 TO BS847 RBL 26.5 WL156 IAW SRM 51-40-02 AND DWG #146A8340.;[08] UPDATED PART USE;[09] VERIFIED CORRECTIVE ACTION 8.;[10] WORKSCOPE IS COMPLETE

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