# SDR SWAA2023031301363

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2023
- Submitted: March 13, 2023
- Operation: Air carrier
- Aircraft: [N277WN](https://openairdocs.org/aircraft/N277WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32531
- Aircraft time: 51,901 hours, 31,206 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Location: Zn 100 Fus Lower
- 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/SWAA2023031301363

## Discrepancy

AFT CARGO COMPARTMENT 'Z' CHANNEL ANGLE CORRODED AROUND ANCHOR NUTS BETWEEN FSTA 727C & 727D LBL-21<[01] FOUND EXFOLIATED CORROSION OUT OF LIMITS AT AFT CARGO COMP L/H Z CHANNEL BETWEEN STA 727C - 727D PER REF SRM 53-00-53-1A-2.;[02] LOCATED AND DRILLED NEW L/H Z CHANNEL FROM STA 727-847 PER REF 51-40-05-0G-0. MATERIAL USED BAC1496-377 7075T PO#2006488.;[03] VERIFIED STEP 1 AND 2. <BR>OK TO TREAT AND PRIME AT NEW LH ZCHANNEL FROM STA 727 TO STA 847.;[04] TREATED AND PRIMED NEW L/H Z CHANNEL PER AMM 51-21-41-370-802 AND AMM 51-21-72-370-804;[05] VERIFIED STEP 4. <BR>OK TO INSTALL NUT PLATES AT LH ZCHANNEL.;[06] INSTALLED NEW NUTPLATES AT NEW L/H Z CHANNEL; PER SRM 51-40-10-2R-0;[07] VERIFIED STEP 6;[08] TASK C/W

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