# SDR SWAA2021090703322

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2021
- Submitted: September 7, 2021
- Operation: Air carrier
- Aircraft: [N449WN](https://openairdocs.org/aircraft/N449WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32469
- Aircraft time: 60,089 hours, 35,684 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Location: Bs 727b-787
- 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/SWAA2021090703322

## Discrepancy

AFT CARGO FLOOR SUPPORT 23 LEFT OF CENTER LINE AT 727B TO 787 HAS CORROSION AROUND NUT PLATES 'Z' CHANNEL. ; / [01] REMOVED-CORROSIONAT AFT CARGO FLOOR SUPPORT 23 LEFT OF CENTER LINE AT -727B TO 787 AROUND BUT PLATES Z CHANNEL AS PER REF B737 SRM 51-10-02-0G-0 FOUND EXFOLIATE CORROSION; [02] REMOVED-CORROSION AT AFT CARGO FLOOR SUPPORT 23 LEFT OF CENTER LINE AT STA: 727B TO 787 AROUND NUT PLATES ZEE CHANNEL AS PER REF B737 SRM 51-10-02-0G-0 FOUND EXFOLIATE CORROSION; [03] VERIFIED CORRECTED STEP 2.; [04] INSTALLED EWIS PROTECTION ON L/H AND R/H SIDE UNDER SIDE PLATES AFT CARGO COMPARTMENT; PER REF. 737 AMM 20-60-07-913-801;15] FABRICATED NEW Z CHANNEL L/H SIDE AFT CARGO FROM STA. 727 TO STA. 847 USING EXISTING SPLICE REPAIR PER REF 737 SRM 51-40-02-0G-0 AND DRAWING # 146A7500; [16] (RII) VERIFED STEP 15.; [17] REMOVED CORROSION ON L/H FLOOR SUPPORT (Z CHANNEL) FROM STA. 727B TO STA.787 PER SRM 51-10-02-0G-O; FOUND EXFOLIATE CORROSION OUT OF LIMITS ; AND FABRICATED NEW Z CHANNEL FROM STA. 727 TO STA.847 PER REF 737 SRM 51-40-02-0G-0 AND DRAWING # 146A7500; [18] (RII) VERIFIED STEP 17.

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