# SDR SWAA2022082231797

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 21, 2022
- Submitted: August 22, 2022
- Operation: Air carrier
- Aircraft: N490WN
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32476
- Aircraft time: 59,880 hours, 35,571 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/SWAA2022082231797

## Discrepancy

CORROSION ON FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BS867+9 RBL21. / [01] VERIFIED APPLICABILITY OF SRM 53-60-53-01-2 FOR IDENTIFICATION AND SRM 53-60-15-1A-1 FOR ALLOWABLE DAMAGE;[02] SRM FOR ALLOWABLE DAMAGE 53-00-53-1A-2;[03] REMOVED CORROSION ON FLOOR TO SIDEWALL SUPPORT AT ACB BS867+9 EVALUATED AS FOLLOW: L=2' W=0.750' D=0.030; ORIGINAL THICKNESS 0.040' PER BAC1496-377. BLENDED AREA FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 STEP 4A (2) FIG 103 DETAIL D.<BR>USED TOOL ID ATS2739 S/N A22004232<BR>DUE 04/2023;[04] VERIFIED CORRECTIVE ACTIONS 1-3.;[05] FABRICATED; LOCATED AND DRILLED FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BS 867 TO BS 887 RBL 21; ITEM BAC1496-377 LOT. 1484618-1 IAW SRM 51-40-02-0G-0 DWG 146A7500. OK TO TREATMENT AND PRIMER IAW SRM 51-20-01-0G-0 AND SOPOM 20-41-02;[06] CORRECTIVE ACTION STEP 5: REFERNCE CORRECT IAW SRM 51-40-05 FOR LOCATED AND DRILLED;[07] VERIFIED CORRECTIVE ACTIONS #5 AND #6 OK TO TREATMENT AND PRIME GIVEN;[08] UPDATED MEASUREMENTS ON TABLE ITEM 22: MINOR REPAIR;[09] VERIFIED MEASUREMENT TABLE;[10] APPLIED CHEMICAL CONVERSION COATING AND PRIMER IAW SRM 51-20-01 AND AMM 51-21-72-370-804.;[11] VERIFIED CORRECTIVE ACTION #10;[12] REINSTALLED SPLICE ON FLOOR TO SIDEWALL SUPPORT AT AFT CARGO BAY BTW BS 883 TO BS 891 RBL 21 WL 156 IAW SRM 51-40-02 AND DWG 146A7501 REV A.;[13] VERIFIED CORRECTIVE ACTION #12;[14] VERIFIED CORRECTIVE ACTION #12

---
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, except the copies of manufacturers’ service documents, which belong to their rights holders.