# SDR SWAA2023041214182

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 8, 2023
- Submitted: April 12, 2023
- Operation: Air carrier
- Aircraft: [N956WN](https://openairdocs.org/aircraft/N956WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36672
- Aircraft time: 38,869 hours, 23,696 cycles
- System (JASC): [5322 · Fuselage Internal Mounting Structure](https://openairdocs.org/jasc/5322)
- Part: Sidewall Support
- 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/SWAA2023041214182

## Discrepancy

FWD CARGO BAY - SIDEWALL SUPPORT HAS CORROSION WL 156 - LBL 24.75 BS 500B+6; 500B+10; BS 500B+14; BS 500C+6; BS 500C+10; BS 500C+14.<[01] REMOVED CORROSION FROM BS 500B+6' TO BS 500C+14'. LARGEST AREA OF DAMAGE AT BS 500C+14' MEASURED 1'L X 0.8'W AND 0.005' ORIGINAL THICKNESS OF 0.040' FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2.;[02] MEASURMENT UPDATE AND VERIFY APPLICABILITY OF SRM 53-00-53-1A-2.;[03] CAL ID DIAL DEPTH GAUGE NCX000697<BR> S/N UNKNOWN<BR> DUE 09/2023;[04] VERIFIED CORRECTIVE ACTION 1-3 AND MEASUREMENT TABLE;[05] FLOOR TO SIDEWALL SUPPORT AT THIS LOCATION TO BE REPLACED ON CUST ID: TTG8Q00JDZNG.<BR>FLOOR TO SIDEWALL SPLICE IS LOCATED BETWEEN STA 480 TO STA 500.;[06] UPDATED MEASUREMENT TABLE;[07] VERIFIED CORRECTIVE ACTIONS 5 AND 6

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.