# SDR SWAA2022072919193

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 15, 2022
- Submitted: July 29, 2022
- Operation: Air carrier
- Aircraft: [N428WN](https://openairdocs.org/aircraft/N428WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29844
- Aircraft time: 66,134 hours, 39,057 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/SWAA2022072919193

## Discrepancy

LOWER FUSELAGE. CENTER WING BOX STIFFENER CRACKED @ LOWER RADIUS W/W FWD BULKHEAD STA 663.75 LBL 25 O/B OF AIR CONDITION AIR EXIT DUCT MKD DOT / [01] REMOVED STIFFENER AT LOWER FUSELAGE STA 663.75 LBL 25 AS PER SRM 51-40-02-0G-0.;[02] REMOVED ONE (EACH) WIRE BUNDLE CLAMP AT STA 663.75 LBL 25 WL 160 AND ONE (EACH) WIRE BUNDLE CLAMP STA 663.75 LBL 25 WL 154 AS PER SRM 51-40-02-0G-0.;[03] VERIFIED STIFFENER REMOVAL AND CLAMP;[04] LOCATED AND DRILLED NEW STIFFENER AS PER SRM 51-40-05-0G-0.;[05] VERIFIED STEP 4. <BR>OK TO INSTALL NEW STIFFENER.;[06] STARTED TO INSTALL NEW STIFFENER AS PER SRM 51-40-02-0G-0 AND DRAWING NUMBER 111A1000.;[07] COMPLETED INSTALLATION OF NEW STIFFENER AS PER SRM 51-40-02-0G-0 AND DRAWING NUMBER 111A1000.;[08] RE-INSTALLED ONE (EACH) WIRE BUNDLE CLAMP AT STA 663.75 LBL 25 WL 160 AND ONE (EACH) WIRE BUNDLE CLAMP STA 663.75 LBL 25 WL 154 AS PER SRM 51-40-02-0G-0.;[09] WORK COMPLETED.;[10] VERIFIED INSTALLATION OF STIFFENER AND CLAMP

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