# SDR SWAA2024071803796

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 20, 2024
- Submitted: July 18, 2024
- Operation: Air carrier
- Aircraft: [N476WN](https://openairdocs.org/aircraft/N476WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32475
- Aircraft time: 66,646 hours, 39,887 cycles
- System (JASC): [5511 · Horizontal Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5511)
- Part: Rib
- Condition: Cracked
- Location: Zone 300
- 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/SWAA2024071803796

## Discrepancy

RH HORIZONTAL LEADING EDGE PANEL 341B RIB #6 FOUND CRACKED.<[01] ***SUMMARY**<BR>REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED RH HORIZONTAL LEADING EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306.<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24<BR>SQUEEZE OUT TIME 12:00 AM @ 06/26/24;[02] VOID ENTRY STEP #1. SUMMARY STEP WAS WRITTEN IN ERROR.;[03] VERIFIED STEP 2. VOID STEP.;[04] ***SUMMARY**<BR>REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED FIRST OVER SIZE FASTENER AT 4TH EXISTING HOLE FROM TOP.<BR>INSTALLED RH HORIZONTAL LEADING-EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306 & DWG 186A101.<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24<BR>SQUEEZE OUT TIME 12:00 AM @ 06/26/24;[05] CORRECTION FOR SUMMARY TO READ REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED FIRST OVER SIZE FASTENER AT 4TH EXISTING HOLE FROM TOP PER SRM 51-40-05-0G-0.SRM 51-40-02-0G-0.<BR>INSTALLED RH HORIZONTAL LEADING-EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306 & DWG 186A1001<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24;[06] RII--VERIFIED STEP 5.

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