# SDR SWAA2021062874817

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2021
- Submitted: June 28, 2021
- Operation: Air carrier
- Aircraft: [N207WN](https://openairdocs.org/aircraft/N207WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 34012
- Aircraft time: 52,378 hours, 31,227 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Support
- Condition: Corroded
- Location: Bs 400
- 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/SWAA2021062874817

## Discrepancy

CORROSION FCB FLOOR TO SIDEWALL SUPPORT RBL24.75; BS400+18.5'; WL157 ; / [01] VERIFIED APPLICABILITY ON SRM 53-30-53-OI-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE; [02] REMOVED CORROSION FROM FLOOR TO SIDEWALL SUPPORT BS400+18.5'' RBL24.75; WL175 IAW SRM 51-10-02-OG-0; MAXIMUM BLENDED AREA 1''X.5''0.020''DEEP; FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2; PAR. 4.A.(2) FIG. 103 DETAIL A.<BR>TOOL USED: CALIPER; P/N:505-675(ISOOO887) S/N:05946723; [03] REMOVED FLOOR TO SIDEWALL SUPPORT BS400 TO BS420 RBL24.75; WL157; IAW SRM 51-40-02-OG-0; [04] FCB FLOOR TO SIDEWALL SUPPORT BS400 TO BS420 RBL24.75; WL 157; REPLACEMENT TO BE ACCOMPLISH ON TASK CARD #TTG8Q0054E24; [05] CORRECTION: REMOVED CORROSION FROM FLOOR TO SIDEWALL SUPPORT BS400+18.5'' RBL24.75; WL157 IAW SRM 51-10-02-OG-0; MAXIMUM BLENDED AREA 1''X.5''0.020''DEEP; FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2; PAR. 4.A.(2) FIG. 103 DETAIL A. <BR>TOOL USED: CALIPER; P/N:505-675(ISOOO887) S/N:05946723; [06] VERIFIED APPLICABILITY ON SRM 53-30-53-OI-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE.<BR>VERIFIED REMOVED CORROSION FROM FLOOR TO SIDEWALL SUPPORT BS400+18.5'' RBL24.75; WL157 IAW SRM 51-10-02-OG-0; MAXIMUM BLENDED AREA 1''X.5''0.020''DEEP; FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2; PAR. 4.A.(2) FIG. 103 DETAIL A.<BR>VERIFIED FCB FLOOR TO SIDEWALL SUPPORT BS400 TO BS420 RBL24.75; WL 157; REPLACEMENT TO BE ACCOMPLISH ON TASK CARD #TTG8Q0054E24.

---
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.