# SDR SWAA2021122041237

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 7, 2021
- Submitted: December 20, 2021
- Operation: Air carrier
- Aircraft: [N778SW](https://openairdocs.org/aircraft/N778SW), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 27883
- Aircraft time: 68,867 hours, 40,745 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2021122041237

## Discrepancy

CORROSION ON L/H FWD CARGO FLOOR, BS 480 - 500D, S25L, WL155.5, Z CHANNEL HAS CORROSION IN SEVERAL AREAS.  REMOVED THE ZEE CHANNEL IAW AD CARD 5330-E-16461-NG, TASK CARD TTG8Q004DXN5 STEP 11,  LOCATED AND DRILLED THE NEW ZEE CHANNEL IAW SRM 51-40-05-0G-0.  TREATED AND APPLIED PRIMER TO THE ZEE CHANNEL IAW SRM 51-20-01-0G-0.  ] FOUND ZEE-CHANNEL CORROSION OUT OF LIMITS IAW SRM 53-00-53-1A-2, STEP 4 .A. (2), FIGURE 103, DETAIL D.   FABRICATED ZEE-CHANNEL, AND LOCATED IAW SRM 51-40-05-0G-0.

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