# SDR SWAA2023021696618

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 29, 2023
- Submitted: February 16, 2023
- Operation: Air carrier
- Aircraft: [N937WN](https://openairdocs.org/aircraft/N937WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36644
- Aircraft time: 44,833 hours, 27,250 cycles
- System (JASC): [5714 · Wing, Center Box](https://openairdocs.org/jasc/5714)
- Part: Stiffener
- 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/SWAA2023021696618

## Discrepancy

LOWER FUSELAGE CENTER WING REAR SPAR BULKHEAD STA 663.75 VAPOR BARRIER SUPPORT STIFFENER CRACKED @ LOWER RADIUS RBL 28 MKD DOT<[01] REMOVED SUPPORT STIFFENER FOR CRACK AT STA 663.75 RBL28 LOWER VAPOR BARRIER SRM 51-40-02-0G-0;[02] RECEIVED NEW STIJJENER PN. 111A1308U16; LOCATED AND DRIILL HOLES. REF. SRM.51-40-05;[03] VERIFIED STEPS 1 AND 2;[04] OK TO INSTALL NEW SUPPORT STIFFENER STA 663.75 RBL 28<BR>LOWER VAPOR BARRIER.;[05] PARFTIAL INSTALLATION DE NEW STIFFER. REF. SRM. 51-40-02;[06] INSTALLED NEW STIFFENER PN. 111A1308U16; AT LOWER FUSELAGE CENTER WING REAR SPAR BULKHEAD STA. 663.75 VAPOR BARRIER RBL. 28'. REF. SRM. 51-40-02;[07] VERIFIED STEP 6

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