# SDR SWAA2022050290223

- 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/SWAA2022050290223

## Discrepancy

CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 20 BS 727A+12; BS 727B+6; BS 727C+6; BS 727C+8; BS 727C+10; BS 727D; BS 727D+2; BS 727D+5; BS 727D+8; BS 727D+10. / [01] REMOVED CORROSION ON FLOOR TO SIDEWALL SUPPORT AT LBL 20 BETWEEN BS727A+12 INCHES . THE LOWEST REMAINING THICKNESS .033' ON BLENDED AREA L=2.2'X W=1'XD=0.007' ORIG. MAT. THK.=.040' FOUND TO BE OUT OF LIMITS I.A.W SRM 53-00-53-1A-2 STEP 4A FIG. 103 DETAIL D ;SRM 53-60-53-01-2 TOOL USED ID:ATS1672 ;S/N:65092939; DUE:03/2023 <BR>THIS DISCREPANCY WILL ACCOMPLISHED ON CARD TTG8Q00BLV44;[02] UPDATED MEASUREMENTS;[03] UPDATED STEPS;[04] VERIFIED STEPS 1-9 AND CORRECTIVE ACTION 1.

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