# SDR CALA2026061617127

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 13, 2026
- Submitted: June 17, 2026
- Operation: Air carrier
- Aircraft: [N37540](https://openairdocs.org/aircraft/N37540), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 64471
- Aircraft time: 13,098 hours, 4,300 cycles
- System (JASC): [5313 · Fuselage Main, Longeron/Stringer](https://openairdocs.org/jasc/5313)
- Part: Stringer
- Part number: 146A3204160
- Condition: Cracked
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026061617127

## Discrepancy

STRINGER 20L, BS 747 FOUND TO BE CRACKED ON FLANGE RADIUS UNDER FRAME IN AFT CARGO CUT OUT AND REMOVED STR 20L BTW STA 767 AND 727L PER AVO17684 AND SRM 53-00-03-2R-1.  ACCOMPLISHED HFEC INSPECTION ON CUT AT STR 20L BTW BS 767 & 727L PER AVO17684 AND SRM 53-00-03-2R-1, REF NDT P6, 51-00-00, PROCEDURE 23. NO CRACK NOTED NOW.   ACCOMPLISHED CUT NEW STRINGER SECTION, CUT STRINGER HAT SECTION AND DRILLED BOTH REF SRM 53-00-03-2R-1 AND AVO17684 REV A.

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