# SDR SWAA2021081799453

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2021
- Submitted: August 17, 2021
- Operation: Air carrier
- Aircraft: [N491WN](https://openairdocs.org/aircraft/N491WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33867
- Aircraft time: 53,758 hours, 31,898 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Condition: Cracked
- Location: Bs 675 Lbl 31
- 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/SWAA2021081799453

## Discrepancy

WHILE ACCOMPLISHING CCN:753-201-00-02; FOUND 1 INCH CRACK AT BS 675 LBL 31 WL 203 COMMON TO THE HORIZONTAL PRESSURE DECK. STARTED REMOVING FASTENERS IAW SRM 53-40-51-2R-2 STEP 4-A.   REMOVED DAMAGED WEB IAW SRM CH 53-40-51-2R-2 PAR.4 C.1-3(D).   HFEC INSPECTED TRIMMED EDGE OF DAMAGE CUTOUT AND ALL EXISTING FASTENER HOLES IN THE REPAIR AREA IAW NDT PART 6 51-00-00 PROCEDURES 23 AND 16. NO CRACKS FOUND.  INSTALLED REPAIR PARTS IAW SRM 53-40-51-2R-2. PAR 4.L FIG 203/REPAIR 2.

---
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.