# SDR SWAA2022060902041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2022
- Submitted: June 9, 2022
- Operation: Air carrier
- Aircraft: [N477WN](https://openairdocs.org/aircraft/N477WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33988
- Aircraft time: 60,414 hours, 35,826 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sidewall Support
- Condition: Corroded
- Location: Aft Cargo
- 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/SWAA2022060902041

## Discrepancy

CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 21 BS 747+2; BS 747+6; BS 747+10; BS 747+14; BS 747+15; BS 747+18. / [01]REMOVED CORROSION FROM R/H ACB FLOOR TO SIDEWALL SUPPORT AT BS747+2 MEASURED 1.2"L X 0.8"W AND 0,006"DEEP, ORIGINAL THICKNESS OF 0.040" FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 REMOVED CORROSION FROM R/H ACB FLOOR TO SIDEWALL SUPPORT AT BS747+6 MEASURED 2"L X 1.4"W AND 0,008"DEEP, ORIGINAL THICKNESS OF 0.040" FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 REMOVED CORROSION FROM R/H ACB FLOOR TO SIDEWALL SUPPORT AT BS747+10 MEASURED 1.4"L X 1"W AND 0,011"DEEP, ORIGINAL THICKNESS OF 0.040" FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 REMOVED CORROSION FROM R/H ACB FLOOR TO SIDEWALL SUPPORT AT BS747+14 MEASURED 1.6"L X 1"W AND 0,013"DEEP, ORIGINAL THICKNESS OF 0.040" FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 REMOVED CORROSION FROM R/H ACB FLOOR TO SIDEWALL SUPPORT AT BS747+18 MEASURED 1.6"L X 0.9"W AND 0,009"DEEP, ORIGINAL THICKNESS OF 0.040" FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 [05] LOCATED; DRILLED AND COUNTERSINK FLOOR TO SIDEWALL SUPPORT FROM. MAT.BAC1496-377#7075T62 LOT. 1484618-1 IAW SRM 51-40-05; SRM 51-40-08 AND BOEING DWG 146A7501 REV.-A OK TO CHEMICAL CONVERSION AND PRIMER;[06] UPDATED MEASUREMENT PARAMETERS.

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