# SDR SWAA2021072689890

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 2021
- Submitted: July 26, 2021
- Operation: Air carrier
- Aircraft: [N913WN](https://openairdocs.org/aircraft/N913WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29840
- Aircraft time: 43,304 hours, 26,170 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Support
- Condition: Corroded
- Location: Bs 407
- 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/SWAA2021072689890

## Discrepancy

CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT BS 407; RBL 24; WL 156.5 (MARKED). ; / [01] VERIFIED APPLICABILITY OF SRM 53-30-53-0I-2 FOR IDENTIFICATION AND SRM 53-00-53--1A-2 FOR ALLOWABLE DAMAGE; [02] REMOVED CORROSION FROM FCB FLOOR TO SIDEWALL SUPPORT BS407; RBL24; WL156.5; P/N 143A7501-184 IN AREA 0.9''X0.3''X0.010'' DEEP; ORIGINAL THICKNESS 0.040''; FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2; PAR. 4.A(2) FIG. 103 .<BR>TOOL USED DEPTH GAGE; ID:ATS2473; N/S/N; [03] FCB FLOOR TO SIDEWALL SUPPORT BS407; RBL24; WL156.5; REPLACEMENT TO BE ACCOMPLISHED ON TASK CARD #TTG8Q005N9P3; [04] VERIFIED CORRECTIVE ACTIONS 1-3.<BR><BR>CORROSION FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2<BR><BR>PART TO BE REPLACED ON TTG8Q005N9P3; [05] FCB FLOOR TO SIDEWALL SUPPORT BS407; RBL24; WL156.5; REPLACEMENT TO BE ACCOMPLISHED ON TASK CARD #TTG8Q005N9P3; [06] VERIFIED REPLACEMENT TO BE ACCOMPLISHED ON TASK CARD #TTG8Q005N9P3

---
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.