# SDR SWAA2022060902045

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2022
- Submitted: June 9, 2022
- Operation: Air carrier
- Aircraft: [N477WN](https://openairdocs.org/aircraft/N477WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33988
- Aircraft time: 60,414 hours, 35,826 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sidewall Support
- Part number: 146A75021
- 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/SWAA2022060902045

## Discrepancy

CORROSION ON AFT CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 21 BS 727+15; BS 727A+10; BS 727A+18; BS 727B+6; BS 727B+14; BS 727C+6; BS 727C+14; BS 727D+5; BS 727D+14; BS 727E+6. / [01] VERIFIED APPLICABILITY FOR ALLOWABLE DAMAGE LIMITS IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 AND IDENTIFICATION IAW SRM 53-60-53-0I-2 IDENTIFICATION 2;[02] UPDATE STEP 1-10;[03] CERTIFIED CORRECTIVE ACTIONS 1-2.;[04] VERIFIED CORRECTIVE ACTION 1 AND 2.;[05] RECEIVED NEW EXTRUSION BAC1496-377#7075T62 LOT 1484618-1. FAB A REPLACEMENT. DRILLED LOCATED AND COUNTERSINKED AND APPLIED CHEMICAL CONVERSION COATING IAW SRM 51-40-05; SRM 51-40-06; SRM 51-40-08; SRM 51-20-01; DWG 1469A7502 ID:0001 REV:A OK TO PRIMER.;[06] UPDATE MEASUREMENT#22 TO MAJOR;[07] VERIFIED CORRECTIVE ACTION #5 AND 6; MEASUREMENT TABLE VERIFIED;[08] RECEIVED NEW EXTRUSION BAC1496-377#7075T62 LOT 1484618-1. FABRICATED SPLICE LOCATED DRILLED COUNTERSINKED AND APPLIED CHEMICAL CONVERSION COATING BS 727E TO BS 747 LBL 21 WL 156 IAW SRM 53-00-53-2R-REPAIR 6;SRM 51-40-05; SRM 51-40-06; SRM 51-40-08; SRM 51-20-01; OK TO PRIMER.;[09] VERIFIED CORRECTIVE ACTION #8<BR> OK TO APPLY PRIMER GIVEN;[10] APPLIED PRIMER ON NEW FLOOR TO SIDEWALL SUPPORT AND REPAIR SPICE AMM 51-21-72-370-804;[11] INSTALLED NEW REPAIR SPLICE LOCATED BTW B/S 727E TO B/S 747 LBL 21 WL 156 IAW SRM 53-00-53-2R-REPAIR 6;[12] VERIFIED CORRECTIVE ACTION #11;[13] UPDATED MEASUREMENTS

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