# SDR SWAA2020051845124

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 2020
- Submitted: May 18, 2020
- Operation: Air carrier
- Aircraft: [N472WN](https://openairdocs.org/aircraft/N472WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33831
- Aircraft time: 55,520 hours, 32,985 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Support
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2020051845124

## Discrepancy

***CORROSION*** ON FLOOR TO SIDEWALL SUPPORT AT FCB BS400 - BS500D LBL23 WL157. / REMOVED CORROSION FROM FCB FLOOR TO SIDEWALL SUPPORT BS 400-500D LBL-23 WL-157 IN AREA OF 1'X2'X0.009' DEEP ORIGINAL MATERIAL THICKNESS 0.040' FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2 LOCATED AND DRILLED NEW FLOOR SUPPORT AND SPLICE MADE FROM BAC 1496-444 #7075T62 LOT #1431953-1 FABRICATED IAW SRM 51-40-05-0G-0 AND DWG #143A7501 REV-B TREATED AND PRIMED IAW SRM 51-20-01-0G-0 AND INSTALLED FLOOR SUPPORT AND SPLICE IAW SRM 51-40-02-0G-0 AND DWG #143A7500

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