# SDR SWAA2023031301358

- 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/SWAA2023031301358

## Discrepancy

AFT CARGO COMPARTMENT 'Z' ANGLE CHANNEL CORRODED AROUND ANCHOR NUTS BETWEEN F/STA 727C & 727D RBL-21<[01] FOUND EXFOLIATED CORROSION OUT OF LIMITS ON R/H Z CHANNEL BETWEEN STA 727C - 727D PER REF SRM 53-00-53-1A-2.;[02] LOCATED AND DRILLED NEW R/H CHANNEL FROM STA 727-767 PER REF SRM 51-40-05-0G-0.;[03] EDIT STEP 2: LOCATED AND DRILLED NEW R/H CHANNEL FROM STA 727-767 PER REF SRM 51-40-05-0G-0. MATERIAL USED BAC1496-377 7075T6 PO#2006488.;[04] VERIFIED STEPS:1;2;3 <BR>OK TO TREAT AND PRIME AT NEW ZCHANNEL STA727-STA767.;[05] TREATED AND PRIMED NEW R/H Z CHANNEL PER AMM 51-21-41-370-802 AND AMM 51-21-72-370-804;[06] VERIFIED STEP 5. <BR>OK TO INSTALL NUTPLATES AT NEW RH ZCHANNEL.;[07] INSTALLED NEW NUTPLATES AT NEW R/H Z CHANNEL; PER SRM 51-40-10-2R-0;[08] VERIFIED STEP 7

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