# SDR SWAA2024120973799

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2024
- Submitted: December 9, 2024
- Operation: Air carrier
- Aircraft: N7859B
- Make and model: Boeing 737-7Q8
- Registry model: [Boeing 737-7Q8](https://openairdocs.org/model/boeing-737-7q8) (OpenAirDocs)
- Aircraft serial: 30641
- Aircraft time: 65,126 hours, 42,760 cycles
- System (JASC): [5313 · Fuselage Main, Longeron/Stringer](https://openairdocs.org/jasc/5313)
- Part: Stringer
- Condition: Cracked
- Location: Zn 100 Fus Lower
- 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/SWAA2024120973799

## Discrepancy

POSSIBLE CRACK INDICATION RECORDED AT STATION STRINGER 1; 727A+9 INCHES; MEASURING APPROXIMATELY 1 INCH IN LENGTH ALONG THE CHEM MILL STEP<[01] APPLIED TOPCOAT STRIPPING AGENT TO AREA IAW SOPM 20-30-02.;[02] STRIPPED PROTECTIVE FINISHES OF THE AREA 4?X3? @ STATION STRINGER 1; 727A+9? REF AMM 51-21-11;[03] TOOLING ADDED;[04] ACCOMPLISHED 2-INCH CRACK VERIFICATION TO STRIPPED AREA OF FUSELAGE AT STA 727A+9 STR 1 IAW NDT MANUAL PART 4 53-30-06 INTERIOR ALONG CHEM MILL STEP; NDT PART 4 53-30-07 EXTERIOR ALONG CHEM MILL STEP AND NDT PART 6 53-30-23 . SKIN THICKNESS VERIFIED IAW SRM REF 53-60-01.

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