# SDR SWAA2023051723561

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2023
- Submitted: May 17, 2023
- Operation: Air carrier
- Aircraft: [N958WN](https://openairdocs.org/aircraft/N958WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36673
- Aircraft time: 38,993 hours, 23,664 cycles
- System (JASC): [5312 · Fuselage Main, Bulkhead](https://openairdocs.org/jasc/5312)
- Part: Bulkhead
- 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/SWAA2023051723561

## Discrepancy

CRACKED LOWER L/H COMPOSITE BULKHEAD AT BS663 LBL34 WL149.<OUT OF ALLOWABLE DAMAGE LIMITS IAW SRM 57-10-10-1A-2 PAR 4.D (1).<BR>A PERMANENT REPAIR WILL BE ACCOMPLISHED IAW SRM 51-70-04-2R-10 AS DIRECTED PER SRM 57-10-10-2R-2 PAR 1.C.;[02] DETERMINED EXTENT OF DAMAGE VIA VISUAL METHOD.<BR>REMOVED DAMAGED AND CONTAMINATED FIBERGLASS PLIES FROM DISCREPANT AREA. PREPARED AREA FOR REPAIR AND CLEANED. <BR>WORKED ACCOMPLISHED IAW SRM 51-70-04-2R-10 PAR 4.A-C.;[03] VALIDATED REPAIR PER SRM 51-70-04-2R-10;[04] VERIFIED CORRECTIVE ACTIONS 1-3 VALIDATED REPAIR PER SRM 51-70-04-2R-10;FABRICATED REPAIR PLIES USING FIBERGLASS BMS 9-3 STYLE 1581; LOT# 1512777-1. <BR>WORK ACCOMPLISHED IAW SRM 51-70-04-2R-10 PAR 4.D.] INSTALLED REPAIR PLIES USING RESIN BMS 8-301; CLASS 1. LOT# JH2EAA8895.<BR>VACUUM BAGGED REPAIR; CHECKED VACUUM BAG FOR LEAKS; VACUUM BAG CHECKED GOOD AND SET REPAIR TO CURE.CALIBRATED TOOLS USED:<BR>VACUUM GAUGE: ATS2798; CAL DUE DATE: 10/2023<BR>HOT BONDER MACHINE: ID: NCX000523; CAL DUE DATE: 06/2023; CURED REPAIR; UNBAGGED REAPIR AND LIGHTLY SANDED REPAIR IAW SRM 51-70-04-2R-10 PARAGRAPH 4.F AND H. PERFORM POST CURE NDI IAW SRM 51-70-04-2R-10 PARAGRAPH 4.G. INSPECTED AND VERIFIED CORRECTIVE ACTION 10.<BR><BR>POST REPAIR UT INSPECTED PER 737NDT PART 4 51-00-02. NO DEFECTS FOUND. TOOL E650 ATS2341 DUE 06/2023.;REFINISHED REPAIR AREA IAW SRM 51-70-04-2R-10 PARAGRAPH 4.H.;[13] FINAL INSPECTION. JOB COMPLETE.

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