# SDR SWAA2022082429552

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 15, 2022
- Submitted: August 24, 2022
- Operation: Air carrier
- Aircraft: [N950WN](https://openairdocs.org/aircraft/N950WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36664
- Aircraft time: 39,351 hours, 23,848 cycles
- System (JASC): [5714 · Wing, Center Box](https://openairdocs.org/jasc/5714)
- Part: Stiffener
- Condition: Cracked
- Location: Center Wing Box
- 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/SWAA2022082429552

## Discrepancy

LOWER FUS.CENTER WING BOX STIFFENER CRACKED @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT MKD DOT 001 / [01] REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;[02] LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;[14] REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;INSTALLED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;CAP-SEALED ALL FASTENERS AT LOWER FUS.CENTER WING BOX STIFFENER CRACKED @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SOPM 20-50-19 AND APPLIED TOP-COAT IN REF AMM 51-21-73-370-803;[15] CORECTION<BR>REMOVED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;LOCATED AND DRILLED NEW STIFFENER IN REF SRM 51-40-02-0G-0;INSTALLED LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SRM 51-40-02-0G-0;CAP-SEALED ALL FASTENERS AT LOWER FUS.CENTER WING BOX STIFFENER @ LOWER END RBL 25 STA 663.75 O/B OF A/C AIR EXHAUST DUCT IN REF SOPM 20-50-19 AND APPLIED TOP-COAT IN REF AMM 51-21-73-370-803;[16] VERIFIED STEPS 13; 14R AND 15

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