# SDR SWAA2023051725026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2023
- Submitted: May 17, 2023
- Operation: Air carrier
- Aircraft: [N958WN](https://openairdocs.org/aircraft/N958WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36673
- Aircraft time: 38,993 hours, 23,664 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- 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/SWAA2023051725026

## Discrepancy

MULTIPLE AREA OF CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21 BS 727B TO BS 727E+9.<[01] SRM 53-00-53-1A-2 FOUND TO BE APPLICABLE<BR>UPDATED MEASUREMENT TABLE;[02] SRM 53-00-53-1A-2 FOUND TO BE APPLICABLE<BR>UPDATED MEASUREMENT TABLE;[03] REMOVED CORROSION AT MULTIPLE AREAS ON ACB FLOOR TO SIDEWALL SUPPORT LBL 21 BS 727B TO BS 727E+9.<BR>DEEPEST BLEND L=1.8' W=1.4 D=0.008' REMAINING THICKNESS=0.032' ORIGINAL THICKNESS=0.040' <BR>DAMAGED FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2. REPAIR BY REPLACEMENT<BR><BR>TOOL USED<BR>DEPTH GAUGE ID:ATS2678 CAL.DUE:02/29/2024;[04] VERIFIED CORRECTION ITEM 3.;[05] TASK WILL BE ACCOMPLISHED AT CUST CARD # TTG800KBW3K;[06] VERIFIED CORRECTIVE ACTIONS STEP 5.;[07] VERIFIED MEASUREMENTS TABLE.;[08] CERTIFY

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