# SDR CALA2020032700713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 25, 2020
- Submitted: March 27, 2020
- Operation: Air carrier
- Aircraft: [N24736](https://openairdocs.org/aircraft/N24736), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28803
- Aircraft time: 66,406 hours, 22,024 cycles
- System (JASC): [5312 · Fuselage Main, Bulkhead](https://openairdocs.org/jasc/5312)
- Part: Stiffener
- Part number: 111A2401U4
- Condition: Cracked
- Location: Fuselage
- 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/CALA2020032700713

## Discrepancy

CENTER WIN BOX FWD UPPER SKIN STA 546  RBL 42 HORIZONTAL STIFFNER SHOW EVIDENCE OF BEING CRACKED . MKD 126-26 REF AAR NR 99878132 REMOVED AND REPLACED CENTER WING BOX FWD UPPER SKIN STA 546 RBL 42 STIFFENER IN REF B737-700 ECRA 5714-01120  PERFORMED HFEC ON EXISTING HOLES REF # PT6 51-00-00 PROC 16 NO CRACKS. FILLED SEAL AND CAP SEAL WILL BE ACCOMPLISHED ON N/R 99878455 C/W INSPECTION

---
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.