# SDR SWAA2022050290215

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2022
- Submitted: May 2, 2022
- Operation: Air carrier
- Aircraft: [N475WN](https://openairdocs.org/aircraft/N475WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32474
- Aircraft time: 59,744 hours, 35,276 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sidewall Support
- Condition: Corroded
- Location: Aft Cargo Bay
- 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/SWAA2022050290215

## Discrepancy

CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT RBL 21 BS 727B+6; BS 727B+14; BS 727C+10; BS 727D+3; BS 727D+6; BS 727D+10; BS 727D+14. / [01] SRM 53-60-53-0I-2 IDENTIFICATION AND SRM 53-00-53-1A-2 ALLOWABLE DAMAGE ARE APPLICABLE<BR><BR>REMOVED CORROSION BY BLENDING FLOOR TO SIDEWALL SUPPORT UPPER SURFACE PER SRM 51-10-02. MATERIAL LOSS L=3.7'; W=1.0'; D=0.010'. ORIGINAL THICKNESS 0.040'; REMAINING THICKNESS 0.030'. FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 FIGURE 103 DETAIL E.<BR>GAGE: ATS1672; S/N:65092939; DUE DATE 03/2023;[02] VERIFIED CORRECTIVE ACTION 1- BLEND OUT OF LIMITS.;[03] UPDATED MEASUREMENTS;[04] FLOOR TO SIDEWALL SUPPORT BS 727-767 RBL 21 IS REPLACED ON CUST. CARD TTG8Q00BLW4N;[05] VERIFIED STEP 2.

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