# SDR SWAA2021120349010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 2021
- Submitted: December 3, 2021
- Operation: Air carrier
- Aircraft: [N478WN](https://openairdocs.org/aircraft/N478WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33989
- Aircraft time: 58,884 hours, 34,869 cycles
- System (JASC): [5730 · Wing, Plate/Skin](https://openairdocs.org/jasc/5730)
- Part: Panel
- Condition: Corroded
- Location: Fuel
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021120349010

## Discrepancy

FUEL PANEL 532JB HAS FRETTING CORROSION AT RING MATTING SURFACE. ; / [01] REMOVED CORROSION IAW B737 ARM 57-20-01-2R 1. REPAIR 1; [02] VERIFIED STEP 1 C/W; [03] EVALUATED MATERIAL LOSS ON PANEL 532JB; LOSS OF .002. MAX ALLOWABLE IS .020. WITHIN LIMITS IAW B737 SRM 57-20-01-2R-1. REPAIR 1. FIGURE 203; VIEW B-B. AAR TOOL #21461; CAL DUE 08/11/22; [04] FLAP PEENED BLENDED AREAS ON PANEL 532JB IAW B737 SRM 57-20-01-2R-1; REPAIR 1; [05] VERIFIED STEPS 3 AND 4 C/W<BR><BR>OK TO TREAT AND PRIME; [06] TREATED BLENDED AREAS ON PANEL 532JB IAW B737 SRM 57-20-01-2R-1. REPAIR 1.; [07] COMPLETED REPAIR OF PANEL 532JB IAW SRM 57-20-01-1 REPAIR 1. ALL STEPS 1-7 COMPLETE.; [08] VOIDING OK TO PRIME ON STEP 5 PER SRM 57-20-01-2R-1 STEP 4K<BR><BR>ALL WORK C/W<BR>AUDIT C/W

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