# SDR SWAA2020030942289

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 21, 2020
- Submitted: March 9, 2020
- Operation: Air carrier
- Aircraft: [N424WN](https://openairdocs.org/aircraft/N424WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29828
- Aircraft time: 61,632 hours, 36,258 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Part number: 146A7500
- 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/SWAA2020030942289

## Discrepancy

***CORROSION*** AFT CARGO COMPARTMENT LT SIDE ZEE CHANNEL CORRODED IN MULTIPLE SPOTS FROM STA 727E TO 747, WRITTEN ON N/R'S DEFECTS NUMBERS W141095, W141087, W141085, W141086, W141094, W141093, W141101, W141090, W141091, W141092, W141078, W141079, W141083, W141089, AND W141088, NEEDS TO BE REPLACED. DOT 82-122, LBL21 WL 155.5        REMOVED CORROSION ON L/H "Z" CHANNEL SUPPORT FROM STA 727E TO STA 747, FOUND EXFOLIETER CORROSION OUT OF LIMITS PER SRM 53-00-53-1A-2, FABRICATED NEW "Z" CHANNEL SPLICE ON STA 737. EXISTING SPLICE, PER REF B737 SRM 53-00-53-2R-5 REP 5. AND INSTALLED FABRICATED NEW "Z" CHANNEL FROM STA 727 TO STA 847 L/H SIDE, LBL 21" AND WL 155.5 PER DRAWING # 146A7500

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