# SDR SWAA2021122251722

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 2, 2021
- Submitted: December 22, 2021
- Operation: Air carrier
- Aircraft: [N910WN](https://openairdocs.org/aircraft/N910WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36618
- Aircraft time: 45,600 hours, 27,244 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Condition: Corroded
- Location: Bs 727-727b
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021122251722

## Discrepancy

CORROSION ON AFT CARGO BAY SIDEWALL TO FLOOR SUPPORT AT RBL 21 BS 727+13; BS 727+16; BS 727A+5; BS 727A+10; BS 727A+15; BS 727A+18; BS 727B+2; BS 727B+5; BS 727B+6; BS 727B+8. ; / [01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 727+16 RBL 21 WL 156 IN 1'X1' AREAS WITH 0.015 REMOVED FROM ORIG 0.040; FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2 USING DEPTH GAUGE ATS 2678 S/N UNKNOWN.; [02] VERIFIED CORRECTIVE ACTION ENTRY 1.; [03] FABRICATED NEW RH ACB FLOOR TO SIDEWALL SUPPORT; BS 727-767 RBL21. AND APPLIED CHEMICAL CONVERSION COATING; ALL IAW SRM 51-40-02-0G-0; SRM 53-60-53-01-2; SRM 51-20-01-0G-0; 146A7500. MATERIAL; BAC1496-377#7075T62; LOT# 1473823-1. OK TO PRIME.; [04] VERIFIED CORRECTIVE ACTION ITEM 3.<BR>OK TO APPLY PRIMER GIVEN.; [05] PRIMED AND ASSEMBLED NEW ACB RH FLOOR TO SIDEWALL SUPPORT; IAW SRM 51-40-02-0G-0; SRM 51-20-01-0G-0; DWG 146A7500.; [06] VERIFIED CORRECTIVE ACTION ENTRY 5. CARD COMPLETE.

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