# SDR SWAA2026082532311

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2026
- Submitted: August 26, 2026
- Operation: Air carrier
- Aircraft: [N8644C](https://openairdocs.org/aircraft/N8644C), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 35973
- Aircraft time: 39,269 hours, 19,358 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sidewall Support
- Condition: Corroded
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2026082532311

## Discrepancy

CORROSION FOUND ALONG LT SIDE OF FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT,  WL 156,  BS 500D+9 - 520.  R & R THE FLOOR TO SIDEWALL SUPPORT, BS 396 - 500I & SPLICES, LBL 23, WL 153 IAW SRM 51-40-02, DWG 143A7501, REV -,  SRM 53-00-53-2R-6, REPAIR 6, & TASK M-22-153-01550.   DURING INSPECTION,  LT FLOOR SIDEWALL SUPPORT, BS 396 - 500I, WL 156, MULTIPLE DEFECTS FOUND,  UNDERDRIVEN RIVETS, MISMATCH HOLES,  ANGELED BUCKTAILS, BUCKTAIL DRIVEN INSIDE INTERCOSTAL HOLE CAUSED A CRACK,  DAMAGED SPLICE PLATE, DAMAGE NUT PLATE SEPRATIONS.   REPAIRED MULTIPLE DEFECTS IAW SRM 51-40-02-0G-0. AFTER CLEANING & FURTHER INSPECTION, NO CRACK HAS BEEN FOUND ON INTERCOSTAL IAW SOPM 20-30-03, & SRM 51-00-06.  R & R THE SPLICE PLATE  IAW SRM 51-40-02, AND TASK M-22-153-01550  BONDING NUT PLATE INSTALLED IAW DWG 146A7502.  HOLE THAT HAD NO MATCH WITH A PILOT DRILL WAS BROUGHT BACK TO ITS ORIGINAL SIZE 3/16 IAW SRM 51-40-02-0G-0.

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